Tribal notification for proposed SPA to expand SMI/SED coverage (IMD-related)
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Notice to Tribal leadership and providers about New Mexico HCA's planned State Plan Amendment (SPA) to maintain and enhance access to mental health services for Medicaid beneficiaries with Serious Mental Illness (SMI) and Serious Emotional Disturbance (SED), including authority to provide treatment for short-term residents in residential and inpatient Institutions for Mental Diseases (IMD). Affects tribal entities as invited consultees. Effective July 1, 2026.
The SPA will authorize provision of clinically appropriate treatment to beneficiaries with SMI and SED while they are short-term residents in residential and inpatient treatment settings that qualify as Institutions for Mental Diseases (IMD).
The SPA is planned to be effective on July 1, 2026.
Estimated federal budget impact: $15,558 FFY2026 and $387,916 FFY2027.
Coverage Criteria for SMI/SED IMD Stays
Proposed SMI/SED IMD Coverage
Proposed coverage expansion under the SMI/SED demonstration component
No specific medical necessity criteria or length-of-stay thresholds provided in this notice
The HCA does not anticipate any impact for Indian Nations, Tribes, and Pueblos and their health care providers with this change.
Actions for Providers and Tribal Entities
SPA proposes IMD-related coverage (no prior auth details in notice)
The letter describes a proposed SPA to allow payment/coverage for short-term IMD stays for beneficiaries with SMI and SED but does not list specific prior authorization requirements, operational rules, or affected billing codes in this notice.
No step therapy requirements described
This notification does not describe any step therapy requirements or step-based treatment sequencing for beneficiaries; no step therapy rules are included in the proposed SPA notice.
Access proposed SPA documents and submit comments
Tribes, Indian health providers, and other interested parties may view the complete draft amendment on the HCA website or request a written copy from HCA/MAD; comments and copies of submitted comments will be made available per the instructions in the notice.
- Draft SPA available at: https://www.hca.nm.gov/2026-comment-period-open/
- Request a written copy by contacting HCA/MAD in Santa Fe at (505) 827-1337.
- Copies of all comments will be made available by HCA/MAD on request, on the HCA/MAD website, or at a location within the requestor's county.
No provider-level authorization or billing details in this notice
Not applicable — this is a tribal notification of a proposed SPA and does not specify provider-level authorization procedures, prior authorization requirements, billing operational details, or denial triggers.
Key Definitions
Residential and Inpatient (IMD) Level-of-Care Criteria
Evidence-Based Services and Treatment Modalities
Background and Purpose
The State Plan Amendment (SPA) is intended to maintain and enhance access to mental health services for Medicaid beneficiaries with Serious Mental Illness (SMI) and Serious Emotional Disturbance (SED). It will authorize provision of clinically appropriate treatment for short-term residents in residential and inpatient settings that qualify as Institutions for Mental Diseases (IMD), and supports delivery system improvements to provide more coordinated, comprehensive, evidence-based care.
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