diff --git a/qiskit/circuit/instruction.py b/qiskit/circuit/instruction.py
index 4268b68225e9..d73d23d712dc 100644
--- a/qiskit/circuit/instruction.py
+++ b/qiskit/circuit/instruction.py
@@ -31,7 +31,7 @@
 import sympy
 import numpy
 
-from qiskit.qasm._node import _node
+from qiskit.qasm.node import node
 from qiskit.exceptions import QiskitError
 from qiskit.circuit.classicalregister import ClassicalRegister
 
@@ -64,7 +64,7 @@ def __init__(self, name, num_qubits, num_clbits, params):
             if isinstance(single_param, sympy.Basic):
                 self.params.append(single_param)
             # example: OpenQASM parsed instruction
-            elif isinstance(single_param, _node.Node):
+            elif isinstance(single_param, node.Node):
                 self.params.append(single_param.sym())
             # example: u3(0.1, 0.2, 0.3)
             elif isinstance(single_param, (int, float)):
diff --git a/qiskit/circuit/quantumcircuit.py b/qiskit/circuit/quantumcircuit.py
index 06eebc0c0db7..126c99717bb8 100644
--- a/qiskit/circuit/quantumcircuit.py
+++ b/qiskit/circuit/quantumcircuit.py
@@ -5,15 +5,14 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Quantum circuit object.
-"""
+"""Quantum circuit object."""
+
 from copy import deepcopy
 import itertools
 import sys
 import multiprocessing as mp
 
-from qiskit.qasm import _qasm
+from qiskit.qasm.qasm import Qasm
 from qiskit.exceptions import QiskitError
 from .quantumregister import QuantumRegister
 from .classicalregister import ClassicalRegister
@@ -465,7 +464,7 @@ def from_qasm_file(path):
         Return:
           QuantumCircuit: The QuantumCircuit object for the input QASM
         """
-        qasm = _qasm.Qasm(filename=path)
+        qasm = Qasm(filename=path)
         return _circuit_from_qasm(qasm)
 
     @staticmethod
@@ -477,7 +476,7 @@ def from_qasm_str(qasm_str):
         Return:
           QuantumCircuit: The QuantumCircuit object for the input QASM
         """
-        qasm = _qasm.Qasm(data=qasm_str)
+        qasm = Qasm(data=qasm_str)
         return _circuit_from_qasm(qasm)
 
 
diff --git a/qiskit/qasm/__init__.py b/qiskit/qasm/__init__.py
index d79e3a33760a..58d43f551a8f 100644
--- a/qiskit/qasm/__init__.py
+++ b/qiskit/qasm/__init__.py
@@ -12,5 +12,5 @@
 
 from sympy import pi
 
-from ._qasm import Qasm
+from .qasm import Qasm
 from .exceptions import QasmError
diff --git a/qiskit/qasm/_node/__init__.py b/qiskit/qasm/_node/__init__.py
deleted file mode 100644
index 01ee90cddbbe..000000000000
--- a/qiskit/qasm/_node/__init__.py
+++ /dev/null
@@ -1,35 +0,0 @@
-# -*- coding: utf-8 -*-
-
-# Copyright 2017, IBM.
-#
-# This source code is licensed under the Apache License, Version 2.0 found in
-# the LICENSE.txt file in the root directory of this source tree.
-
-"""QASM nodes."""
-from ._barrier import Barrier
-from ._binaryop import BinaryOp
-from ._binaryoperator import BinaryOperator
-from ._cnot import Cnot
-from ._creg import Creg
-from ._customunitary import CustomUnitary
-from ._expressionlist import ExpressionList
-from ._external import External
-from ._gate import Gate
-from ._gatebody import GateBody
-from ._id import Id
-from ._idlist import IdList
-from ._if import If
-from ._indexedid import IndexedId
-from ._intnode import Int
-from ._format import Format
-from ._measure import Measure
-from ._opaque import Opaque
-from ._prefix import Prefix
-from ._primarylist import PrimaryList
-from ._program import Program
-from ._qreg import Qreg
-from ._real import Real
-from ._reset import Reset
-from ._unaryoperator import UnaryOperator
-from ._universalunitary import UniversalUnitary
-from ._nodeexception import NodeException
diff --git a/qiskit/qasm/node/__init__.py b/qiskit/qasm/node/__init__.py
new file mode 100644
index 000000000000..1c7f265e2498
--- /dev/null
+++ b/qiskit/qasm/node/__init__.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+
+# Copyright 2017, IBM.
+#
+# This source code is licensed under the Apache License, Version 2.0 found in
+# the LICENSE.txt file in the root directory of this source tree.
+
+"""QASM nodes."""
+
+from .barrier import Barrier
+from .binaryop import BinaryOp
+from .binaryoperator import BinaryOperator
+from .cnot import Cnot
+from .creg import Creg
+from .customunitary import CustomUnitary
+from .expressionlist import ExpressionList
+from .external import External
+from .gate import Gate
+from .gatebody import GateBody
+from .id import Id
+from .idlist import IdList
+from .if_ import If
+from .indexedid import IndexedId
+from .intnode import Int
+from .format import Format
+from .measure import Measure
+from .opaque import Opaque
+from .prefix import Prefix
+from .primarylist import PrimaryList
+from .program import Program
+from .qreg import Qreg
+from .real import Real
+from .reset import Reset
+from .unaryoperator import UnaryOperator
+from .universalunitary import UniversalUnitary
+from .nodeexception import NodeException
diff --git a/qiskit/qasm/_node/_barrier.py b/qiskit/qasm/node/barrier.py
similarity index 80%
rename from qiskit/qasm/_node/_barrier.py
rename to qiskit/qasm/node/barrier.py
index 95aae110fccf..076b6023d20d 100644
--- a/qiskit/qasm/_node/_barrier.py
+++ b/qiskit/qasm/node/barrier.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM barrier statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM barrier statement."""
+
+from .node import Node
 
 
 class Barrier(Node):
@@ -19,7 +18,7 @@ class Barrier(Node):
 
     def __init__(self, children):
         """Create the barrier node."""
-        Node.__init__(self, 'barrier', children, None)
+        super().__init__('barrier', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_binaryop.py b/qiskit/qasm/node/binaryop.py
similarity index 91%
rename from qiskit/qasm/_node/_binaryop.py
rename to qiskit/qasm/node/binaryop.py
index 5fb258b81e38..52f67a199d50 100644
--- a/qiskit/qasm/_node/_binaryop.py
+++ b/qiskit/qasm/node/binaryop.py
@@ -5,12 +5,11 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM binary operation expression.
-"""
+"""Node for an OPENQASM binary operation expression."""
+
 import sympy
 
-from ._node import Node
+from .node import Node
 
 
 class BinaryOp(Node):
@@ -23,7 +22,7 @@ class BinaryOp(Node):
 
     def __init__(self, children):
         """Create the binaryop node."""
-        Node.__init__(self, 'binop', children, None)
+        super().__init__('binop', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_binaryoperator.py b/qiskit/qasm/node/binaryoperator.py
similarity index 86%
rename from qiskit/qasm/_node/_binaryoperator.py
rename to qiskit/qasm/node/binaryoperator.py
index 31e4115355c1..c661b9db2cf9 100644
--- a/qiskit/qasm/_node/_binaryoperator.py
+++ b/qiskit/qasm/node/binaryoperator.py
@@ -5,13 +5,12 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM binary operator.
-"""
+"""Node for an OPENQASM binary operator."""
+
 import operator
 
-from ._node import Node
-from ._nodeexception import NodeException
+from .node import Node
+from .nodeexception import NodeException
 
 
 VALID_OPERATORS = {
@@ -30,7 +29,7 @@ class BinaryOperator(Node):
     """
     def __init__(self, operation):
         """Create the operator node."""
-        Node.__init__(self, 'operator', None, None)
+        super().__init__('operator', None, None)
         self.value = operation
 
     def operation(self):
diff --git a/qiskit/qasm/_node/_cnot.py b/qiskit/qasm/node/cnot.py
similarity index 84%
rename from qiskit/qasm/_node/_cnot.py
rename to qiskit/qasm/node/cnot.py
index c8cfe9c292a9..504d9c3bfc47 100644
--- a/qiskit/qasm/_node/_cnot.py
+++ b/qiskit/qasm/node/cnot.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM CNOT statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM CNOT statement."""
+
+from .node import Node
 
 
 class Cnot(Node):
@@ -20,7 +19,7 @@ class Cnot(Node):
 
     def __init__(self, children):
         """Create the cnot node."""
-        Node.__init__(self, 'cnot', children, None)
+        super().__init__('cnot', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_creg.py b/qiskit/qasm/node/creg.py
similarity index 89%
rename from qiskit/qasm/_node/_creg.py
rename to qiskit/qasm/node/creg.py
index b777baab62a9..57367f9259c0 100644
--- a/qiskit/qasm/_node/_creg.py
+++ b/qiskit/qasm/node/creg.py
@@ -7,10 +7,9 @@
 
 # pylint: disable=invalid-name
 
-"""
-Node for an OPENQASM creg statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM creg statement."""
+
+from .node import Node
 
 
 class Creg(Node):
@@ -21,7 +20,7 @@ class Creg(Node):
 
     def __init__(self, children):
         """Create the creg node."""
-        Node.__init__(self, 'creg', children, None)
+        super().__init__('creg', children, None)
         # This is the indexed id, the full "id[n]" object
         self.id = children[0]
         # Name of the creg
diff --git a/qiskit/qasm/_node/_customunitary.py b/qiskit/qasm/node/customunitary.py
similarity index 89%
rename from qiskit/qasm/_node/_customunitary.py
rename to qiskit/qasm/node/customunitary.py
index f5518cf59af9..169810fe35af 100644
--- a/qiskit/qasm/_node/_customunitary.py
+++ b/qiskit/qasm/node/customunitary.py
@@ -7,10 +7,9 @@
 
 # pylint: disable=invalid-name
 
-"""
-Node for an OPENQASM custom gate statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM custom gate statement."""
+
+from .node import Node
 
 
 class CustomUnitary(Node):
@@ -29,7 +28,7 @@ class CustomUnitary(Node):
 
     def __init__(self, children):
         """Create the custom gate node."""
-        Node.__init__(self, 'custom_unitary', children, None)
+        super().__init__('custom_unitary', children, None)
         self.id = children[0]
         self.name = self.id.name
         if len(children) == 3:
diff --git a/qiskit/qasm/_node/_expressionlist.py b/qiskit/qasm/node/expressionlist.py
similarity index 83%
rename from qiskit/qasm/_node/_expressionlist.py
rename to qiskit/qasm/node/expressionlist.py
index 8f3c41efe7a6..1c1ef22d1789 100644
--- a/qiskit/qasm/_node/_expressionlist.py
+++ b/qiskit/qasm/node/expressionlist.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM expression list.
-"""
-from ._node import Node
+"""Node for an OPENQASM expression list."""
+
+from .node import Node
 
 
 class ExpressionList(Node):
@@ -19,7 +18,7 @@ class ExpressionList(Node):
 
     def __init__(self, children):
         """Create the expression list node."""
-        Node.__init__(self, 'expression_list', children, None)
+        super().__init__('expression_list', children, None)
 
     def size(self):
         """Return the number of expressions."""
diff --git a/qiskit/qasm/_node/_external.py b/qiskit/qasm/node/external.py
similarity index 92%
rename from qiskit/qasm/_node/_external.py
rename to qiskit/qasm/node/external.py
index 3968db05e0f9..ef181e2bafef 100644
--- a/qiskit/qasm/_node/_external.py
+++ b/qiskit/qasm/node/external.py
@@ -7,12 +7,11 @@
 
 # pylint: disable=invalid-name
 
-"""
-Node for an OPENQASM external function.
-"""
+"""Node for an OPENQASM external function."""
+
 import sympy
-from ._node import Node
-from ._nodeexception import NodeException
+from .node import Node
+from .nodeexception import NodeException
 
 
 class External(Node):
@@ -24,7 +23,7 @@ class External(Node):
 
     def __init__(self, children):
         """Create the external node."""
-        Node.__init__(self, 'external', children, None)
+        super().__init__('external', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_format.py b/qiskit/qasm/node/format.py
similarity index 79%
rename from qiskit/qasm/_node/_format.py
rename to qiskit/qasm/node/format.py
index 922a746e12ce..d8fa0b17f033 100644
--- a/qiskit/qasm/_node/_format.py
+++ b/qiskit/qasm/node/format.py
@@ -5,21 +5,19 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM file identifier/version statement.
-"""
+"""Node for an OPENQASM file identifier/version statement."""
+
 import re
 
-from ._node import Node
+from .node import Node
 
 
 class Format(Node):
-    """Node for an OPENQASM file identifier/version statement.
-    """
+    """Node for an OPENQASM file identifier/version statement."""
 
     def __init__(self, value):
         """Create the version node."""
-        Node.__init__(self, "format", None, None)
+        super().__init__("format", None, None)
         parts = re.match(r'(\w+)\s+(\d+)\.(\d+)', value)
         self.language = parts.group(1)
         self.majorversion = parts.group(2)
diff --git a/qiskit/qasm/_node/_gate.py b/qiskit/qasm/node/gate.py
similarity index 93%
rename from qiskit/qasm/_node/_gate.py
rename to qiskit/qasm/node/gate.py
index 826017b0ca36..40d89a6db4c6 100644
--- a/qiskit/qasm/_node/_gate.py
+++ b/qiskit/qasm/node/gate.py
@@ -7,10 +7,9 @@
 
 # pylint: disable=invalid-name
 
-"""
-Node for an OPENQASM gate definition.
-"""
-from ._node import Node
+"""Node for an OPENQASM gate definition."""
+
+from .node import Node
 
 
 class Gate(Node):
@@ -25,7 +24,7 @@ class Gate(Node):
 
     def __init__(self, children):
         """Create the gate node."""
-        Node.__init__(self, 'gate', children, None)
+        super().__init__('gate', children, None)
         self.id = children[0]
         # The next three fields are required by the symbtab
         self.name = self.id.name
diff --git a/qiskit/qasm/_node/_gatebody.py b/qiskit/qasm/node/gatebody.py
similarity index 87%
rename from qiskit/qasm/_node/_gatebody.py
rename to qiskit/qasm/node/gatebody.py
index 9bf5cbae5782..707451bcf44a 100644
--- a/qiskit/qasm/_node/_gatebody.py
+++ b/qiskit/qasm/node/gatebody.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM custom gate body.
-"""
-from ._node import Node
+"""Node for an OPENQASM custom gate body."""
+
+from .node import Node
 
 
 class GateBody(Node):
@@ -20,7 +19,7 @@ class GateBody(Node):
 
     def __init__(self, children):
         """Create the gatebody node."""
-        Node.__init__(self, 'gate_body', children, None)
+        super().__init__('gate_body', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_id.py b/qiskit/qasm/node/id.py
similarity index 94%
rename from qiskit/qasm/_node/_id.py
rename to qiskit/qasm/node/id.py
index 5b3b7c263b97..e7033c231b0b 100644
--- a/qiskit/qasm/_node/_id.py
+++ b/qiskit/qasm/node/id.py
@@ -5,11 +5,10 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM id.
-"""
-from ._node import Node
-from ._nodeexception import NodeException
+"""Node for an OPENQASM id."""
+
+from .node import Node
+from .nodeexception import NodeException
 
 
 class Id(Node):
@@ -22,7 +21,7 @@ class Id(Node):
     def __init__(self, id, line, file):
         """Create the id node."""
         # pylint: disable=redefined-builtin
-        Node.__init__(self, "id", None, None)
+        super().__init__("id", None, None)
         self.name = id
         self.line = line
         self.file = file
diff --git a/qiskit/qasm/_node/_idlist.py b/qiskit/qasm/node/idlist.py
similarity index 85%
rename from qiskit/qasm/_node/_idlist.py
rename to qiskit/qasm/node/idlist.py
index ddebd0588181..435b302e7811 100644
--- a/qiskit/qasm/_node/_idlist.py
+++ b/qiskit/qasm/node/idlist.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM idlist.
-"""
-from ._node import Node
+"""Node for an OPENQASM idlist."""
+
+from .node import Node
 
 
 class IdList(Node):
@@ -19,7 +18,7 @@ class IdList(Node):
 
     def __init__(self, children):
         """Create the idlist node."""
-        Node.__init__(self, 'id_list', children, None)
+        super().__init__('id_list', children, None)
 
     def size(self):
         """Return the length of the list."""
diff --git a/qiskit/qasm/_node/_if.py b/qiskit/qasm/node/if_.py
similarity index 86%
rename from qiskit/qasm/_node/_if.py
rename to qiskit/qasm/node/if_.py
index 075e590e7ba4..5120a776e69e 100644
--- a/qiskit/qasm/_node/_if.py
+++ b/qiskit/qasm/node/if_.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM if statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM if statement."""
+
+from .node import Node
 
 
 class If(Node):
@@ -22,7 +21,7 @@ class If(Node):
 
     def __init__(self, children):
         """Create the if node."""
-        Node.__init__(self, 'if', children, None)
+        super().__init__('if', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_indexedid.py b/qiskit/qasm/node/indexedid.py
similarity index 88%
rename from qiskit/qasm/_node/_indexedid.py
rename to qiskit/qasm/node/indexedid.py
index 729119bb6974..4fbed5d29fe2 100644
--- a/qiskit/qasm/_node/_indexedid.py
+++ b/qiskit/qasm/node/indexedid.py
@@ -7,10 +7,9 @@
 
 # pylint: disable=invalid-name
 
-"""
-Node for an OPENQASM indexed id.
-"""
-from ._node import Node
+"""Node for an OPENQASM indexed id."""
+
+from .node import Node
 
 
 class IndexedId(Node):
@@ -22,7 +21,7 @@ class IndexedId(Node):
 
     def __init__(self, children):
         """Create the indexed id node."""
-        Node.__init__(self, 'indexed_id', children, None)
+        super().__init__('indexed_id', children, None)
         self.id = children[0]
         self.name = self.id.name
         self.line = self.id.line
diff --git a/qiskit/qasm/_node/_intnode.py b/qiskit/qasm/node/intnode.py
similarity index 92%
rename from qiskit/qasm/_node/_intnode.py
rename to qiskit/qasm/node/intnode.py
index d8195145f97d..d90fb318d764 100644
--- a/qiskit/qasm/_node/_intnode.py
+++ b/qiskit/qasm/node/intnode.py
@@ -5,12 +5,11 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM integer.
-"""
+"""Node for an OPENQASM integer."""
+
 from sympy import N
 
-from ._node import Node
+from .node import Node
 
 
 class Int(Node):
@@ -22,7 +21,7 @@ class Int(Node):
     def __init__(self, id):
         """Create the integer node."""
         # pylint: disable=redefined-builtin
-        Node.__init__(self, "int", None, None)
+        super().__init__("int", None, None)
         self.value = id
 
     def to_string(self, indent):
diff --git a/qiskit/qasm/_node/_measure.py b/qiskit/qasm/node/measure.py
similarity index 83%
rename from qiskit/qasm/_node/_measure.py
rename to qiskit/qasm/node/measure.py
index 0b10dc52da16..37d7861bc0a5 100644
--- a/qiskit/qasm/_node/_measure.py
+++ b/qiskit/qasm/node/measure.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM measure statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM measure statement."""
+
+from .node import Node
 
 
 class Measure(Node):
@@ -20,7 +19,7 @@ class Measure(Node):
 
     def __init__(self, children):
         """Create the measure node."""
-        Node.__init__(self, 'measure', children, None)
+        super().__init__('measure', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_node.py b/qiskit/qasm/node/node.py
similarity index 96%
rename from qiskit/qasm/_node/_node.py
rename to qiskit/qasm/node/node.py
index 175e8df0a5f2..0d536e1c7f09 100644
--- a/qiskit/qasm/_node/_node.py
+++ b/qiskit/qasm/node/node.py
@@ -5,9 +5,7 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Base node object for the OPENQASM syntax tree.
-"""
+"""Base node object for the OPENQASM syntax tree."""
 
 
 class Node:
diff --git a/qiskit/qasm/_node/_nodeexception.py b/qiskit/qasm/node/nodeexception.py
similarity index 89%
rename from qiskit/qasm/_node/_nodeexception.py
rename to qiskit/qasm/node/nodeexception.py
index b42fe5b7e6fd..57ba73dd0021 100644
--- a/qiskit/qasm/_node/_nodeexception.py
+++ b/qiskit/qasm/node/nodeexception.py
@@ -5,9 +5,7 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Exception for errors raised while interpreting nodes.
-"""
+"""Exception for errors raised while interpreting nodes."""
 
 
 class NodeException(Exception):
diff --git a/qiskit/qasm/_node/_opaque.py b/qiskit/qasm/node/opaque.py
similarity index 92%
rename from qiskit/qasm/_node/_opaque.py
rename to qiskit/qasm/node/opaque.py
index 1d826d99bcdf..bc9ff93ecaa6 100644
--- a/qiskit/qasm/_node/_opaque.py
+++ b/qiskit/qasm/node/opaque.py
@@ -7,10 +7,9 @@
 
 # pylint: disable=invalid-name
 
-"""
-Node for an OPENQASM opaque gate declaration.
-"""
-from ._node import Node
+"""Node for an OPENQASM opaque gate declaration."""
+
+from .node import Node
 
 
 class Opaque(Node):
@@ -24,7 +23,7 @@ class Opaque(Node):
 
     def __init__(self, children):
         """Create the opaque gate node."""
-        Node.__init__(self, 'opaque', children, None)
+        super().__init__('opaque', children, None)
         self.id = children[0]
         # The next three fields are required by the symbtab
         self.name = self.id.name
diff --git a/qiskit/qasm/_node/_prefix.py b/qiskit/qasm/node/prefix.py
similarity index 91%
rename from qiskit/qasm/_node/_prefix.py
rename to qiskit/qasm/node/prefix.py
index f2ce9722dc33..d68a2f4ae94b 100644
--- a/qiskit/qasm/_node/_prefix.py
+++ b/qiskit/qasm/node/prefix.py
@@ -5,12 +5,11 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM prefix expression.
-"""
+"""Node for an OPENQASM prefix expression."""
+
 import sympy
 
-from ._node import Node
+from .node import Node
 
 
 class Prefix(Node):
@@ -22,7 +21,7 @@ class Prefix(Node):
 
     def __init__(self, children):
         """Create the prefix node."""
-        Node.__init__(self, 'prefix', children, None)
+        super().__init__('prefix', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_primarylist.py b/qiskit/qasm/node/primarylist.py
similarity index 85%
rename from qiskit/qasm/_node/_primarylist.py
rename to qiskit/qasm/node/primarylist.py
index 2241b5f29cb4..ea110d666ce8 100644
--- a/qiskit/qasm/_node/_primarylist.py
+++ b/qiskit/qasm/node/primarylist.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM primarylist.
-"""
-from ._node import Node
+"""Node for an OPENQASM primarylist."""
+
+from .node import Node
 
 
 class PrimaryList(Node):
@@ -19,7 +18,7 @@ class PrimaryList(Node):
 
     def __init__(self, children):
         """Create the primarylist node."""
-        Node.__init__(self, 'primary_list', children, None)
+        super().__init__('primary_list', children, None)
 
     def size(self):
         """Return the size of the list."""
diff --git a/qiskit/qasm/_node/_program.py b/qiskit/qasm/node/program.py
similarity index 83%
rename from qiskit/qasm/_node/_program.py
rename to qiskit/qasm/node/program.py
index dc870adf6a1b..bf7ae36364a9 100644
--- a/qiskit/qasm/_node/_program.py
+++ b/qiskit/qasm/node/program.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM program.
-"""
-from ._node import Node
+"""Node for an OPENQASM program."""
+
+from .node import Node
 
 
 class Program(Node):
@@ -19,7 +18,7 @@ class Program(Node):
 
     def __init__(self, children):
         """Create the program node."""
-        Node.__init__(self, 'program', children, None)
+        super().__init__('program', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_qreg.py b/qiskit/qasm/node/qreg.py
similarity index 89%
rename from qiskit/qasm/_node/_qreg.py
rename to qiskit/qasm/node/qreg.py
index 7d2bce678561..da1581561a98 100644
--- a/qiskit/qasm/_node/_qreg.py
+++ b/qiskit/qasm/node/qreg.py
@@ -7,10 +7,9 @@
 
 # pylint: disable=invalid-name
 
-"""
-Node for an OPENQASM qreg statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM qreg statement."""
+
+from .node import Node
 
 
 class Qreg(Node):
@@ -21,7 +20,7 @@ class Qreg(Node):
 
     def __init__(self, children):
         """Create the qreg node."""
-        Node.__init__(self, 'qreg', children, None)
+        super().__init__('qreg', children, None)
         # This is the indexed id, the full "id[n]" object
         self.id = children[0]
         # Name of the qreg
diff --git a/qiskit/qasm/_node/_real.py b/qiskit/qasm/node/real.py
similarity index 92%
rename from qiskit/qasm/_node/_real.py
rename to qiskit/qasm/node/real.py
index b8a30e4c03ba..e57fd97d97c6 100644
--- a/qiskit/qasm/_node/_real.py
+++ b/qiskit/qasm/node/real.py
@@ -5,12 +5,11 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM real number.
-"""
+"""Node for an OPENQASM real number."""
+
 from sympy import latex, pi
 from sympy.printing.ccode import ccode
-from ._node import Node
+from .node import Node
 
 
 class Real(Node):
@@ -22,7 +21,7 @@ class Real(Node):
     def __init__(self, id):
         """Create the real node."""
         # pylint: disable=redefined-builtin
-        Node.__init__(self, "real", None, None)
+        super().__init__("real", None, None)
         self.value = id
 
     def to_string(self, indent):
diff --git a/qiskit/qasm/_node/_reset.py b/qiskit/qasm/node/reset.py
similarity index 81%
rename from qiskit/qasm/_node/_reset.py
rename to qiskit/qasm/node/reset.py
index a821ecafa7ad..c85abdab9568 100644
--- a/qiskit/qasm/_node/_reset.py
+++ b/qiskit/qasm/node/reset.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM reset statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM reset statement."""
+
+from .node import Node
 
 
 class Reset(Node):
@@ -19,7 +18,7 @@ class Reset(Node):
 
     def __init__(self, children):
         """Create the reset node."""
-        Node.__init__(self, 'reset', children, None)
+        super().__init__('reset', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_node/_unaryoperator.py b/qiskit/qasm/node/unaryoperator.py
similarity index 85%
rename from qiskit/qasm/_node/_unaryoperator.py
rename to qiskit/qasm/node/unaryoperator.py
index 7635e5cddb61..ae4489dde310 100644
--- a/qiskit/qasm/_node/_unaryoperator.py
+++ b/qiskit/qasm/node/unaryoperator.py
@@ -5,13 +5,12 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM unary operator.
-"""
+"""Node for an OPENQASM unary operator."""
+
 import operator
 
-from ._node import Node
-from ._nodeexception import NodeException
+from .node import Node
+from .nodeexception import NodeException
 
 
 VALID_OPERATORS = {
@@ -27,7 +26,7 @@ class UnaryOperator(Node):
     """
     def __init__(self, operation):
         """Create the operator node."""
-        Node.__init__(self, 'unary_operator', None, None)
+        super().__init__('unary_operator', None, None)
         self.value = operation
 
     def operation(self):
diff --git a/qiskit/qasm/_node/_universalunitary.py b/qiskit/qasm/node/universalunitary.py
similarity index 83%
rename from qiskit/qasm/_node/_universalunitary.py
rename to qiskit/qasm/node/universalunitary.py
index 29d7da500329..d25ca7d5f14a 100644
--- a/qiskit/qasm/_node/_universalunitary.py
+++ b/qiskit/qasm/node/universalunitary.py
@@ -5,10 +5,9 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-Node for an OPENQASM U statement.
-"""
-from ._node import Node
+"""Node for an OPENQASM U statement."""
+
+from .node import Node
 
 
 class UniversalUnitary(Node):
@@ -20,7 +19,7 @@ class UniversalUnitary(Node):
 
     def __init__(self, children):
         """Create the U node."""
-        Node.__init__(self, 'universal_unitary', children, None)
+        super().__init__('universal_unitary', children, None)
 
     def qasm(self, prec=15):
         """Return the corresponding OPENQASM string."""
diff --git a/qiskit/qasm/_qasm.py b/qiskit/qasm/qasm.py
similarity index 97%
rename from qiskit/qasm/_qasm.py
rename to qiskit/qasm/qasm.py
index 8d030d78ea4e..dabe0f9e2a65 100644
--- a/qiskit/qasm/_qasm.py
+++ b/qiskit/qasm/qasm.py
@@ -9,7 +9,7 @@
 OPENQASM circuit object.
 """
 from .exceptions import QasmError
-from ._qasmparser import QasmParser
+from .qasmparser import QasmParser
 
 
 class Qasm:
diff --git a/qiskit/qasm/_qasmlexer.py b/qiskit/qasm/qasmlexer.py
similarity index 99%
rename from qiskit/qasm/_qasmlexer.py
rename to qiskit/qasm/qasmlexer.py
index 47ae278db1a5..addb9928abe5 100644
--- a/qiskit/qasm/_qasmlexer.py
+++ b/qiskit/qasm/qasmlexer.py
@@ -17,7 +17,7 @@
 import ply.lex as lex
 from sympy import Number
 
-from . import _node as node
+from . import node
 from .exceptions import QasmError
 
 CORE_LIBS_PATH = os.path.join(os.path.dirname(__file__), 'libs')
diff --git a/qiskit/qasm/_qasmparser.py b/qiskit/qasm/qasmparser.py
similarity index 99%
rename from qiskit/qasm/_qasmparser.py
rename to qiskit/qasm/qasmparser.py
index 3086e966d1cc..72a4c0959a60 100644
--- a/qiskit/qasm/_qasmparser.py
+++ b/qiskit/qasm/qasmparser.py
@@ -5,9 +5,8 @@
 # This source code is licensed under the Apache License, Version 2.0 found in
 # the LICENSE.txt file in the root directory of this source tree.
 
-"""
-OPENQASM parser.
-"""
+"""OpenQASM parser."""
+
 import os
 import shutil
 import tempfile
@@ -15,9 +14,9 @@
 import ply.yacc as yacc
 import sympy
 
-from . import _node as node
+from . import node
 from .exceptions import QasmError
-from ._qasmlexer import QasmLexer
+from .qasmlexer import QasmLexer
 
 
 class QasmParser:
diff --git a/test/python/test_qasm_parser.py b/test/python/test_qasm_parser.py
index 53a3d8eddfcd..274d3c9942f5 100644
--- a/test/python/test_qasm_parser.py
+++ b/test/python/test_qasm_parser.py
@@ -11,7 +11,7 @@
 import ply
 
 from qiskit.qasm import Qasm, QasmError
-from qiskit.qasm._node._node import Node
+from qiskit.qasm.node.node import Node
 from qiskit.test import QiskitTestCase, Path