diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index e69de29bb2d..2711e565f0b 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -0,0 +1,4 @@
+- bump: minor
+  changes:
+    added:
+    - Colorado OmniSalud program providing ACA marketplace subsidies for undocumented immigrants and DACA recipients.
diff --git a/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/child_max_age.yaml b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/child_max_age.yaml
new file mode 100644
index 00000000000..7e87aaffa3b
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/child_max_age.yaml
@@ -0,0 +1,15 @@
+description: Colorado OmniSalud defines children as individuals this age and under for eligibility purposes.
+metadata:
+  unit: year
+  period: year
+  label: Colorado OmniSalud child maximum age
+  reference:
+    - title: C.R.S. 10-16-1203(7) - Qualified individual definition
+      href: https://law.justia.com/codes/colorado/title-10/health-care-coverage/article-16/part-12/section-10-16-1203/
+    - title: Colorado OmniSalud Guide 2024
+      href: https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf#page=4
+    - title: Connect for Health Colorado OmniSalud 2025 Updates
+      href: https://connectforhealthco.com/get-started/omnisalud/
+
+values:
+  2022-01-01: 18
diff --git a/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/covers_daca.yaml b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/covers_daca.yaml
new file mode 100644
index 00000000000..ae26e82f93f
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/covers_daca.yaml
@@ -0,0 +1,18 @@
+description: If true, Colorado OmniSalud covers DACA recipients, otherwise they use the regular ACA marketplace.
+metadata:
+  unit: bool
+  period: year
+  label: Colorado OmniSalud covers DACA recipients
+  reference:
+    - title: C.R.S. 10-16-1203(7) - Qualified individual (regardless of immigration status)
+      href: https://law.justia.com/codes/colorado/title-10/health-care-coverage/article-16/part-12/section-10-16-1203/
+    - title: Connect for Health Colorado OmniSalud 2025 Updates
+      href: https://connectforhealthco.com/get-started/omnisalud/
+    - title: Colorado OmniSalud Guide 2024, p. 3
+      href: https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf#page=3
+    - title: Health First Colorado - Health Coverage for Immigrants
+      href: https://www.healthfirstcolorado.com/health-coverage-for-immigrants/
+
+values:
+  2022-01-01: true
+  2025-01-01: false
diff --git a/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/covers_undocumented_children.yaml b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/covers_undocumented_children.yaml
new file mode 100644
index 00000000000..9d20ed90c98
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/covers_undocumented_children.yaml
@@ -0,0 +1,18 @@
+description: If true, Colorado OmniSalud covers undocumented children and pregnant individuals, otherwise they use Health First Colorado (Medicaid).
+metadata:
+  unit: bool
+  period: year
+  label: Colorado OmniSalud covers undocumented children
+  reference:
+    - title: C.R.S. 10-16-1203(7) - Qualified individual (regardless of immigration status)
+      href: https://law.justia.com/codes/colorado/title-10/health-care-coverage/article-16/part-12/section-10-16-1203/
+    - title: Connect for Health Colorado OmniSalud 2025 Updates
+      href: https://connectforhealthco.com/get-started/omnisalud/
+    - title: Colorado OmniSalud Guide 2024, p. 4
+      href: https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf#page=4
+    - title: Health First Colorado - Health Coverage for Immigrants (Cover All Coloradans, HB 22-1289)
+      href: https://www.healthfirstcolorado.com/health-coverage-for-immigrants/
+
+values:
+  2022-01-01: true
+  2025-01-01: false
diff --git a/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/in_effect.yaml b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/in_effect.yaml
new file mode 100644
index 00000000000..56be046e958
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/in_effect.yaml
@@ -0,0 +1,16 @@
+description: If true, Colorado OmniSalud provides health coverage access for immigrants ineligible for federal programs.
+metadata:
+  unit: bool
+  period: year
+  label: Colorado OmniSalud program in effect
+  reference:
+    - title: C.R.S. 10-16-1203 - Health Insurance Affordability Enterprise definitions
+      href: https://law.justia.com/codes/colorado/title-10/health-care-coverage/article-16/part-12/section-10-16-1203/
+    - title: Colorado OmniSalud Guide 2024, p. 1
+      href: https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf#page=1
+    - title: Connect for Health Colorado OmniSalud Overview
+      href: https://connectforhealthco.com/get-started/omnisalud/
+
+values:
+  2020-01-01: false
+  2022-01-01: true
diff --git a/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/income_limit.yaml b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/income_limit.yaml
new file mode 100644
index 00000000000..c61d24b9f63
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/co/hcpf/omnisalud/eligibility/income_limit.yaml
@@ -0,0 +1,15 @@
+description: Colorado OmniSalud provides SilverEnhanced Savings financial assistance to individuals with income at or below this percent of FPL.
+metadata:
+  unit: /1
+  period: year
+  label: Colorado OmniSalud income limit as fraction of FPL
+  reference:
+    - title: C.R.S. 10-16-1203(4) - Federal poverty line definition
+      href: https://law.justia.com/codes/colorado/title-10/health-care-coverage/article-16/part-12/section-10-16-1203/
+    - title: Colorado OmniSalud Guide 2024, p. 2
+      href: https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf#page=2
+    - title: Connect for Health Colorado OmniSalud Overview
+      href: https://connectforhealthco.com/get-started/omnisalud/
+
+values:
+  2022-01-01: 1.50
diff --git a/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/co_omnisalud.yaml b/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/co_omnisalud.yaml
new file mode 100644
index 00000000000..1a811b82be4
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/co_omnisalud.yaml
@@ -0,0 +1,115 @@
+# Tests for Colorado OmniSalud benefit calculation
+# The benefit equals the SLCSP (second lowest cost silver plan) premium
+# for eligible individuals
+
+- name: Eligible undocumented adult receives SLCSP as annual benefit
+  period: 2024
+  input:
+    people:
+      adult:
+        age: 30
+        immigration_status: UNDOCUMENTED
+        is_pregnant: false
+        medicaid_income_level: 1.0  # 100% FPL - under 150% limit
+    tax_units:
+      tax_unit:
+        members: [adult]
+        slcsp: 6_000  # Yearly SLCSP
+    households:
+      household:
+        members: [adult]
+        state_code: CO
+  output:
+    co_omnisalud_eligible: [true]
+    co_omnisalud: 6_000
+
+- name: Ineligible citizen receives zero benefit
+  period: 2024
+  input:
+    people:
+      adult:
+        age: 30
+        immigration_status: CITIZEN
+        is_pregnant: false
+        medicaid_income_level: 1.0  # 100% FPL
+    tax_units:
+      tax_unit:
+        members: [adult]
+        slcsp: 6_000
+    households:
+      household:
+        members: [adult]
+        state_code: CO
+  output:
+    co_omnisalud_eligible: [false]
+    co_omnisalud: 0
+
+- name: Tax unit with one eligible member receives benefit
+  period: 2024
+  input:
+    people:
+      citizen_adult:
+        age: 35
+        immigration_status: CITIZEN
+        is_pregnant: false
+        medicaid_income_level: 1.0  # 100% FPL
+      undocumented_spouse:
+        age: 32
+        immigration_status: UNDOCUMENTED
+        is_pregnant: false
+        medicaid_income_level: 1.0  # 100% FPL
+    tax_units:
+      tax_unit:
+        members: [citizen_adult, undocumented_spouse]
+        slcsp: 9_600  # Yearly SLCSP for couple
+    households:
+      household:
+        members: [citizen_adult, undocumented_spouse]
+        state_code: CO
+  output:
+    # Citizen is not eligible, undocumented spouse is eligible
+    co_omnisalud_eligible: [false, true]
+    # Tax unit gets benefit because at least one member is eligible
+    co_omnisalud: 9_600
+
+- name: Income too high - no benefit
+  period: 2024
+  input:
+    people:
+      adult:
+        age: 30
+        immigration_status: UNDOCUMENTED
+        is_pregnant: false
+        medicaid_income_level: 2.0  # 200% FPL - above 150% limit
+    tax_units:
+      tax_unit:
+        members: [adult]
+        slcsp: 6_000
+    households:
+      household:
+        members: [adult]
+        state_code: CO
+  output:
+    co_omnisalud_eligible: [false]
+    co_omnisalud: 0
+
+- name: Program not in effect before 2022
+  period: 2021
+  input:
+    people:
+      adult:
+        age: 30
+        immigration_status: UNDOCUMENTED
+        is_pregnant: false
+        medicaid_income_level: 1.0  # 100% FPL
+    tax_units:
+      tax_unit:
+        members: [adult]
+        slcsp: 6_000
+    households:
+      household:
+        members: [adult]
+        state_code: CO
+  output:
+    co_omnisalud_eligible: [false]
+    co_omnisalud: 0
diff --git a/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_eligible.yaml
new file mode 100644
index 00000000000..4b7ec67a09d
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_eligible.yaml
@@ -0,0 +1,78 @@
+# Tests for overall Colorado OmniSalud eligibility
+
+- name: Undocumented adult with low income eligible
+  period: 2024
+  input:
+    age: 30
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    medicaid_income_level: 1.0  # 100% FPL
+    state_code: CO
+  output:
+    co_omnisalud_eligible: true
+
+- name: Undocumented adult with income too high NOT eligible
+  period: 2024
+  input:
+    age: 30
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    medicaid_income_level: 2.0  # 200% FPL (above 150% limit)
+    state_code: CO
+  output:
+    co_omnisalud_eligible: false
+
+- name: DACA recipient with low income eligible in 2024
+  period: 2024
+  input:
+    age: 25
+    immigration_status: DACA
+    is_pregnant: false
+    medicaid_income_level: 1.0  # 100% FPL
+    state_code: CO
+  output:
+    co_omnisalud_eligible: true
+
+- name: DACA recipient NOT eligible in 2025
+  period: 2025
+  input:
+    age: 25
+    immigration_status: DACA
+    is_pregnant: false
+    medicaid_income_level: 1.0  # 100% FPL
+    state_code: CO
+  output:
+    co_omnisalud_eligible: false
+
+- name: US citizen NOT eligible regardless of income
+  period: 2024
+  input:
+    age: 30
+    immigration_status: CITIZEN
+    is_pregnant: false
+    medicaid_income_level: 1.0  # 100% FPL
+    state_code: CO
+  output:
+    co_omnisalud_eligible: false
+
+- name: Program not in effect before 2022
+  period: 2021
+  input:
+    age: 30
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    medicaid_income_level: 1.0  # 100% FPL
+    state_code: CO
+  output:
+    co_omnisalud_eligible: false
+
+- name: NOT eligible at exactly 150% FPL
+  period: 2024
+  input:
+    age: 30
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    medicaid_income_level: 1.5  # 150% FPL (at limit, not below)
+    state_code: CO
+  output:
+    co_omnisalud_eligible: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_immigration_status_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_immigration_status_eligible.yaml
new file mode 100644
index 00000000000..52f3367d735
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_immigration_status_eligible.yaml
@@ -0,0 +1,118 @@
+# Tests for Colorado OmniSalud immigration status eligibility
+
+# Undocumented adults are eligible
+- name: Undocumented adult eligible for OmniSalud
+  period: 2024
+  input:
+    age: 30
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: true
+
+# DACA recipients eligible before 2025
+- name: DACA recipient eligible in 2024
+  period: 2024
+  input:
+    age: 25
+    immigration_status: DACA
+    is_pregnant: false
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: true
+
+- name: DACA recipient NOT eligible in 2025 (moves to regular ACA)
+  period: 2025
+  input:
+    age: 25
+    immigration_status: DACA
+    is_pregnant: false
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: false
+
+# Undocumented children eligible before 2025
+- name: Undocumented child eligible in 2024
+  period: 2024
+  input:
+    age: 10
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: true
+
+- name: Undocumented child NOT eligible in 2025 (moves to Health First CO)
+  period: 2025
+  input:
+    age: 10
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: false
+
+# Undocumented pregnant individuals
+- name: Undocumented pregnant person eligible in 2024
+  period: 2024
+  input:
+    age: 25
+    immigration_status: UNDOCUMENTED
+    is_pregnant: true
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: true
+
+- name: Undocumented pregnant person NOT eligible in 2025 (moves to Health First CO)
+  period: 2025
+  input:
+    age: 25
+    immigration_status: UNDOCUMENTED
+    is_pregnant: true
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: false
+
+# Undocumented adults still eligible in 2025
+- name: Undocumented adult still eligible in 2025
+  period: 2025
+  input:
+    age: 30
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: true
+
+# Citizens and LPRs should NOT be eligible (they use regular programs)
+- name: US citizen NOT eligible for OmniSalud
+  period: 2024
+  input:
+    age: 30
+    immigration_status: CITIZEN
+    is_pregnant: false
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: false
+
+- name: LPR NOT eligible for OmniSalud
+  period: 2024
+  input:
+    age: 30
+    immigration_status: LEGAL_PERMANENT_RESIDENT
+    is_pregnant: false
+    state_code: CO
+  output:
+    co_omnisalud_immigration_status_eligible: false
+
+# Non-CO residents not eligible
+- name: Undocumented person in TX not eligible
+  period: 2024
+  input:
+    age: 30
+    immigration_status: UNDOCUMENTED
+    is_pregnant: false
+    state_code: TX
+  output:
+    co_omnisalud_immigration_status_eligible: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_income_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_income_eligible.yaml
new file mode 100644
index 00000000000..9d980504195
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_income_eligible.yaml
@@ -0,0 +1,50 @@
+# Tests for Colorado OmniSalud income eligibility
+# Income limit is 150% FPL for SilverEnhanced Savings financial assistance
+
+- name: Income below 150% FPL is eligible
+  period: 2024
+  input:
+    medicaid_income_level: 1.0  # 100% FPL
+    state_code: CO
+  output:
+    co_omnisalud_income_eligible: true
+
+- name: Income at exactly 150% FPL is NOT eligible
+  period: 2024
+  input:
+    medicaid_income_level: 1.50  # 150% FPL (at limit, not below)
+    state_code: CO
+  output:
+    co_omnisalud_income_eligible: false
+
+- name: Income above 150% FPL is NOT eligible
+  period: 2024
+  input:
+    medicaid_income_level: 1.51  # 151% FPL
+    state_code: CO
+  output:
+    co_omnisalud_income_eligible: false
+
+- name: Income at 200% FPL is NOT eligible
+  period: 2024
+  input:
+    medicaid_income_level: 2.0  # 200% FPL
+    state_code: CO
+  output:
+    co_omnisalud_income_eligible: false
+
+- name: Very low income is eligible
+  period: 2024
+  input:
+    medicaid_income_level: 0.5  # 50% FPL
+    state_code: CO
+  output:
+    co_omnisalud_income_eligible: true
+
+- name: Non-CO resident not eligible
+  period: 2024
+  input:
+    medicaid_income_level: 1.0  # 100% FPL
+    state_code: TX
+  output:
+    co_omnisalud_income_eligible: false
diff --git a/policyengine_us/variables/gov/hhs/medicaid/eligibility/is_medicaid_eligible.py b/policyengine_us/variables/gov/hhs/medicaid/eligibility/is_medicaid_eligible.py
index a67f255a857..d3ff8be4292 100644
--- a/policyengine_us/variables/gov/hhs/medicaid/eligibility/is_medicaid_eligible.py
+++ b/policyengine_us/variables/gov/hhs/medicaid/eligibility/is_medicaid_eligible.py
@@ -19,6 +19,7 @@ def formula(person, period, parameters):
         )
         ca_ffyp_eligible = person("ca_ffyp_eligible", period)
         il_hbi_eligible = person("il_hbi_eligible", period)
+
         p = parameters(period).gov.hhs.medicaid.eligibility
         if p.work_requirements.applies:
             work_requirement_eligible = person(
diff --git a/policyengine_us/variables/gov/states/co/hcpf/omnisalud/co_omnisalud.py b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/co_omnisalud.py
new file mode 100644
index 00000000000..3eef12f9273
--- /dev/null
+++ b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/co_omnisalud.py
@@ -0,0 +1,23 @@
+from policyengine_us.model_api import *
+
+
+class co_omnisalud(Variable):
+    value_type = float
+    entity = TaxUnit
+    label = "Colorado OmniSalud premium subsidy"
+    unit = USD
+    definition_period = YEAR
+    defined_for = "co_omnisalud_tax_unit_eligible"
+    adds = ["slcsp"]
+    reference = [
+        "https://connectforhealthco.com/get-started/omnisalud/",
+        "https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf",
+    ]
+    documentation = """
+    Colorado OmniSalud provides a premium subsidy (SilverEnhanced Savings)
+    that covers the full cost of health insurance premiums for eligible
+    individuals, resulting in $0 monthly premium.
+
+    The benefit value is equal to the second lowest cost silver plan (SLCSP)
+    premium, similar to the federal ACA premium tax credit.
+    """
diff --git a/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_eligible.py b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_eligible.py
new file mode 100644
index 00000000000..0fee6d11864
--- /dev/null
+++ b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_eligible.py
@@ -0,0 +1,37 @@
+from policyengine_us.model_api import *
+
+
+class co_omnisalud_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Eligible for Colorado OmniSalud"
+    definition_period = YEAR
+    defined_for = StateCode.CO
+    reference = [
+        "https://connectforhealthco.com/get-started/omnisalud/",
+        "https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf",
+    ]
+    documentation = """
+    Colorado OmniSalud provides marketplace coverage with premium subsidies
+    to individuals who are ineligible for Health First Colorado (Medicaid),
+    CHP+, or federal ACA subsidies due to their immigration status.
+    """
+
+    def formula(person, period, parameters):
+        p = parameters(period).gov.states.co.hcpf.omnisalud.eligibility
+
+        # Program must be in effect
+        in_effect = p.in_effect
+
+        # Must have eligible immigration status (undocumented, DACA before 2025)
+        immigration_eligible = person(
+            "co_omnisalud_immigration_status_eligible", period
+        )
+
+        # Must meet income requirements for financial assistance
+        income_eligible = person("co_omnisalud_income_eligible", period)
+
+        # Must not be eligible for other coverage
+        # (Medicaid/CHP+ eligibility already checked via immigration status)
+
+        return in_effect & immigration_eligible & income_eligible
diff --git a/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_immigration_status_eligible.py b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_immigration_status_eligible.py
new file mode 100644
index 00000000000..b4c1b41b1f5
--- /dev/null
+++ b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_immigration_status_eligible.py
@@ -0,0 +1,65 @@
+from policyengine_us.model_api import *
+
+
+class co_omnisalud_immigration_status_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Has eligible immigration status for Colorado OmniSalud"
+    definition_period = YEAR
+    defined_for = StateCode.CO
+    reference = [
+        "https://connectforhealthco.com/get-started/omnisalud/",
+        "https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf",
+    ]
+    documentation = """
+    Colorado OmniSalud covers immigrants who are NOT eligible for federal
+    ACA subsidies due to their immigration status. This includes:
+    - Undocumented immigrants (adults only starting 2025)
+    - DACA recipients (before 2025 - they move to regular ACA in 2025)
+
+    Starting 2025, undocumented children and pregnant individuals move to
+    Health First Colorado (Medicaid).
+    """
+
+    def formula(person, period, parameters):
+        p = parameters(period).gov.states.co.hcpf.omnisalud.eligibility
+        immigration_status = person("immigration_status", period)
+        age = person("age", period)
+        is_pregnant = person("is_pregnant", period)
+
+        # Check if undocumented
+        undocumented = (
+            immigration_status
+            == immigration_status.possible_values.UNDOCUMENTED
+        )
+
+        # Check if DACA (covered before 2025)
+        daca = immigration_status == immigration_status.possible_values.DACA
+        daca_tps = (
+            immigration_status == immigration_status.possible_values.DACA_TPS
+        )
+        is_daca = daca | daca_tps
+
+        # Children and pregnant individuals move to Health First Colorado in 2025
+        is_child = age <= p.child_max_age
+
+        # Determine if person's status is covered by OmniSalud
+        # Undocumented adults are always covered
+        # Undocumented children covered before 2025 (parameter controls this)
+        # Undocumented pregnant covered before 2025
+        # DACA covered before 2025 (parameter controls this)
+        undocumented_child_covered = (
+            undocumented & is_child & p.covers_undocumented_children
+        )
+        undocumented_pregnant_covered = (
+            undocumented & is_pregnant & p.covers_undocumented_children
+        )
+        undocumented_adult_covered = undocumented & ~is_child & ~is_pregnant
+        daca_covered = is_daca & p.covers_daca
+
+        return (
+            undocumented_adult_covered
+            | undocumented_child_covered
+            | undocumented_pregnant_covered
+            | daca_covered
+        )
diff --git a/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_income_eligible.py b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_income_eligible.py
new file mode 100644
index 00000000000..8e85a321b5f
--- /dev/null
+++ b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_income_eligible.py
@@ -0,0 +1,25 @@
+from policyengine_us.model_api import *
+
+
+class co_omnisalud_income_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Meets Colorado OmniSalud income eligibility"
+    definition_period = YEAR
+    defined_for = StateCode.CO
+    reference = [
+        "https://connectforhealthco.com/get-started/omnisalud/",
+        "https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf",
+    ]
+    documentation = """
+    Colorado OmniSalud provides financial assistance (SilverEnhanced Savings)
+    to individuals with income below 150% of the Federal Poverty Level.
+    Those with higher income can still enroll but pay full premium.
+    """
+
+    def formula(person, period, parameters):
+        p = parameters(period).gov.states.co.hcpf.omnisalud.eligibility
+        # Use ACA MAGI as the income measure
+        income_level = person("medicaid_income_level", period)
+
+        return income_level < p.income_limit
diff --git a/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_tax_unit_eligible.py b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_tax_unit_eligible.py
new file mode 100644
index 00000000000..2c5324c9164
--- /dev/null
+++ b/policyengine_us/variables/gov/states/co/hcpf/omnisalud/eligibility/co_omnisalud_tax_unit_eligible.py
@@ -0,0 +1,19 @@
+from policyengine_us.model_api import *
+
+
+class co_omnisalud_tax_unit_eligible(Variable):
+    value_type = bool
+    entity = TaxUnit
+    label = "Tax unit eligible for Colorado OmniSalud"
+    definition_period = YEAR
+    defined_for = StateCode.CO
+    reference = [
+        "https://connectforhealthco.com/get-started/omnisalud/",
+        "https://coloradoimmigrant.org/wp-content/uploads/2024/03/Eng.-OmniSalud-Guide-2024.pdf",
+    ]
+    documentation = """
+    A tax unit is eligible for Colorado OmniSalud if any member is eligible.
+    """
+
+    def formula(tax_unit, period, parameters):
+        return tax_unit.any(tax_unit.members("co_omnisalud_eligible", period))
diff --git a/policyengine_us/variables/household/healthcare_benefit_value.py b/policyengine_us/variables/household/healthcare_benefit_value.py
index 1e1bc0dd1af..68668b8e45c 100644
--- a/policyengine_us/variables/household/healthcare_benefit_value.py
+++ b/policyengine_us/variables/household/healthcare_benefit_value.py
@@ -11,4 +11,5 @@ class healthcare_benefit_value(Variable):
         "medicaid_cost",
         "per_capita_chip",
         "aca_ptc",
+        "co_omnisalud",
     ]