H-codes: Medicaid's parallel universe for BH services

H-codes vs CPT: two code sets built for two different purposes

CPT is the procedure code set the AMA maintains and updates annually, and it's the code set HIPAA names for professional health-care transactions — built around discrete medical and psychotherapeutic procedures a clinician performs 1Ref 1American Medical Association (2026).CPT® (Current Procedural Terminology).Supports that CPT is AMA-maintained, updated annually, and the HIPAA-named procedure code set, contrasted against the state-defined H-code range.. A lot of what a state Medicaid behavioral-health or substance-use program pays for doesn't fit that frame at all: targeted case management, day treatment, peer support, and other rehabilitative or care-coordination services are defined by the state's own Medicaid plan, not by a CPT procedure description — which is why Medicaid bills much of this work under a different code family entirely, one whose specific meaning varies by state.

That state-by-state variation is the single most important fact here, so it's worth stating plainly before anything else: a given H-code's definition, what it covers, and what it pays in one state's Medicaid manual will not necessarily match another state's manual using the identical code. Always confirm against your own state's authority — never assume a neighboring state's definition travels.

Why CPT doesn't cover most of what a Medicaid BH program pays for

As a practice pattern, state Medicaid behavioral-health and SUD systems commonly cover a layer of rehabilitative and case-management services that sit outside what a CPT procedure code was ever built to describe — supportive services delivered by a broader range of staff than the clinicians CPT assumes, often measured in units of time or per encounter rather than a discrete procedure. Rather than stretch CPT to cover work it wasn't designed for, states use the H-code range as the vehicle for these state-plan-defined services.

This is why a solo BH practice enrolled in both commercial insurance and Medicaid frequently runs two entirely separate fee schedules in the same practice-management system: one CPT-based for standard psychotherapy and evaluation, one H-code-based for whatever rehabilitative or case-management services the state Medicaid plan covers and the practice is licensed to deliver.

How a state assigns meaning to its own H-codes

Each state Medicaid agency publishes its own provider manual and fee schedule defining what a specific H-code means, who can bill it, and what it pays within that state's program — and the four examples below show how differently this plays out in practice, not a template to generalize from:

• California — the Department of Health Care Services publishes California's behavioral-health billing manuals and fee schedules for its Medicaid program 2Ref 2California Department of Health Care Services (2026).California Department of Health Care Services.Named example of a state Medicaid agency publishing its own billing manuals and fee schedules for behavioral-health H-codes..
• Texas — the Texas Medicaid & Healthcare Partnership publishes Texas's own enrollment, billing manuals, and fee schedules 3Ref 3Texas Health and Human Services Commission (2026).Texas Medicaid & Healthcare Partnership (TMHP).Named example of a state Medicaid agency publishing its own billing manuals and fee schedules for behavioral-health H-codes..
• Florida — the Agency for Health Care Administration publishes Florida's Medicaid provider manuals and fee schedules 4Ref 4Florida Agency for Health Care Administration (2026).Florida Agency for Health Care Administration.Named example of a state Medicaid agency publishing its own billing manuals and fee schedules for behavioral-health H-codes..
• New York — eMedNY, the New York State Department of Health's provider system, publishes New York's own billing manuals and fee schedules 5Ref 5New York State Department of Health (2026).eMedNY.Named example of a state Medicaid agency publishing its own billing manuals and fee schedules for behavioral-health H-codes..

If you're enrolled in more than one state's Medicaid program, treat each state's manual as its own closed reference — don't carry an H-code definition, unit value, or billing rule from one state's manual into a claim submitted to another.

Medicare's different path: CPT, not H-codes

Medicare covers psychiatric evaluation and psychotherapy under the standard CPT code set, the same codes used in commercial billing, rather than the state-specific H-code range Medicaid behavioral-health programs use 6Ref 6Centers for Medicare & Medicaid Services (2025).Medicare and Mental Health Coverage.Supports that Medicare covers behavioral health services under the standard CPT code set rather than the Medicaid H-code range.. A client who carries both Medicare and Medicaid coverage — a dual-eligible beneficiary — can therefore generate claims under two different code families depending on which payer a given service is billed to, which is a common source of confusion in a solo billing operation juggling both programs for the same person.

When a private administrator still bills you into H-codes

Many states carve out behavioral-health benefits under Medicaid to a private managed behavioral-health organization rather than administering claims directly — understanding your state's Medicaid BH carve-outs structure tells you which entity's manual actually governs the claim, since it may not be the state agency's own published fee schedule at all. A large national vendor's own provider portal, such as Optum's Provider Express, is one example of how a private administrator runs enrollment, authorization, and claims for a behavioral-health network it manages on a payer's behalf 7Ref 7Optum Behavioral Health (2026).Provider Express.Illustrates how a private managed behavioral-health organization can administer a state's Medicaid BH carve-out under its own provider portal and code list. — and where that vendor administers a state's Medicaid BH carve-out, its H-code list and unit definitions are the ones that control, not a generic state-wide assumption.

Telehealth and screening: two questions the H-code list doesn't answer by itself

Whether a specific H-code is payable when delivered by telehealth is a separate question from whether the code exists on your state's list at all — your state's Medicaid telehealth rules, and more specifically when audio-only sessions are billable, each carry their own answer that has to be checked against the H-code list, not assumed from it.

A validated screening instrument billed under a CPT screening code like 96127 alongside E/M typically stays a CPT claim even for a Medicaid beneficiary, since a screening instrument is a procedure CPT already defines — it doesn't move to the H-code list simply because the payer is Medicaid. Keep the two codebooks straight rather than assuming everything billed to Medicaid runs through the H-code range.

Finding your state's actual H-code list

Go to your own state Medicaid agency's provider manual or fee schedule directly — not a national summary, and not another state's — and confirm the code's current definition, unit value, and any prior-authorization or provider-type restriction before billing it for the first time. States update these manuals on their own schedule, so recheck at renewal rather than assuming last year's definition still holds.

If you're running or planning the EHR migration for a solo BH practice that bills both Medicaid and commercial insurance, confirm the system can carry two separate fee schedules — CPT and your state's H-code list — as distinct code sets with their own unit and modifier rules, rather than one merged list that quietly drops one codebook's specific requirements.