Idaho Medicaid Program Overview
Enrollment, funding, and managed care facts for Idaho Medicaid.
Get Idaho's Medicaid Fee Schedule →Enrollment
Idaho Medicaid covered approximately 0.31-0.33M people. Two independent sources give different-period figures for total Idaho Medicaid/CHIP enrollment: KFF's state indicator (310,400, May 2026) and CMS's 2024 Medicaid Managed Care Enrollment and Program Characteristics report (331,580 total Medicaid enrollees, July 1, 2024). Consistent with continued post-pandemic 'unwinding' enrollment decline between mid-2024 and mid-2026, not a data error. Reported as a range rather than a single false-precision number.
Funding & federal match
Idaho has adopted ACA Medicaid expansion, effective 2020-01-01.
For FFY2026 (Oct 1, 2025 - Sep 30, 2026), Idaho's Federal Medical Assistance Percentage (FMAP) is 66.91%.
Delivery system & managed care
A large share of Idaho Medicaid is delivered through managed care organizations (MCOs) rather than fee-for-service — estimates range from 6-6.4% of Medicaid enrollees.
Waivers
Idaho operates Medicaid managed care under the Idaho Behavioral Health Transformation, a Section 1115 demonstration waiver. Allows Medicaid reimbursement for mental health and substance use disorder services provided to adults in Institutions for Mental Diseases (IMDs), as part of a broader effort to expand community-based behavioral health care, improve care coordination, and reduce ED visits and inpatient psychiatric hospitalizations. Approved by CMS in April 2020 for a five-year demonstration period (through ~March/April 2025); a full renewal application was submitted March 12, 2025, and CMS granted a temporary extension while that application is under review, currently through September 30, 2026.
Has Idaho expanded Medicaid under the ACA?
Yes. Idaho has adopted ACA Medicaid expansion. Effective 2020-01-01.
How many people are enrolled in Idaho Medicaid?
Approximately 0.31-0.33M people.
What percentage of the federal Medicaid match does Idaho receive?
66.91% for FFY2026 (Oct 1, 2025 - Sep 30, 2026) — meaning the federal government pays roughly 67 cents of every Idaho Medicaid dollar, and the state pays the rest.
Is most of Idaho Medicaid delivered through managed care?
Estimates range from 6-6.4% of Medicaid enrollees in managed care.
What Medicaid waivers does Idaho operate under?
Idaho Behavioral Health Transformation, a Section 1115 demonstration waiver. Allows Medicaid reimbursement for mental health and substance use disorder services provided to adults in Institutions for Mental Diseases (IMDs), as part of a broader effort to expand community-based behavioral health care, improve care coordination, and reduce ED visits and inpatient psychiatric hospitalizations. Approved by CMS in April 2020 for a five-year demonstration period (through ~March/April 2025); a full renewal application was submitted March 12, 2025, and CMS granted a temporary extension while that application is under review, currently through September 30, 2026.
Get Idaho's Free Medicaid Fee Schedule
Request actual Idaho Medicaid reimbursement rates by billing code — free, delivered as a CSV.
Sources
- KFF State Health Facts - Total Monthly Medicaid & CHIP Enrollment
- CMS - Medicaid Managed Care Enrollment and Program Characteristics, 2024
- Federal Register / GPO - Federal Financial Participation in State Assistance Expenditures, FFY2026 FMAP Notice (2024-27910)
- KFF State Health Facts - Federal Matching Rate (FMAP) for Medicaid
- KFF - Status of State Action on the Medicaid Expansion Decision
- healthinsurance.org - Medicaid eligibility and enrollment in Idaho
- MACPAC - MACStats Medicaid and CHIP Data Book, Exhibit 29 (Percentage of Medicaid Enrollees in Managed Care by State, July 1, 2022)
- Idaho Department of Health and Welfare - Idaho Behavioral Health Transformation Waiver
- Medicaid.gov - Idaho Behavioral Health Transformation, CMS Completeness Letter
Data last verified 2026-09-17. Also see our free Medicaid Fee Schedule tool.