Federal Rules for Behavioral Health: 3 Easy Checks
Federal rules for behavioral health set the floor for how plans must treat mental health coverage, how substance use records are protected, and how Medicare pays. Three of them affect a practice’s billing in 2026: the federal parity law, 42 CFR Part 2 and the Medicare Physician Fee Schedule. This guide shows what each one does and what to check first.
The three federal rules for behavioral health at a glance
Each rule works differently and reaches different people. Parity applies to health plans. Part 2 applies to certain substance use treatment programs. The fee schedule sets Medicare payment.
| Rule | Who it reaches | Status on 10/24/26 |
|---|---|---|
| Mental Health Parity and Addiction Equity Act (MHPAEA) | Group health plans and insurers | Law in force; new 2024 rule provisions not being enforced |
| 42 CFR Part 2 | Federally assisted substance use disorder programs | Final rule compliance date was February 16, 2026 |
| Medicare Physician Fee Schedule | Providers billing Medicare | 2027 rule proposed, not final |
Check 1: parity, the federal rule for plans
The federal rules for behavioral health start with parity: a plan that covers mental health or substance use care cannot limit it more harshly than medical and surgical care. The Centers for Medicare & Medicaid Services (CMS) explains that MHPAEA does not itself require plans to cover mental health care. It covers both fully insured and self-funded employer plans, and it does not apply directly to Medicare or Medicaid.
Parity binds the plan, so ask counsel before you rely on it in an appeal. On May 15, 2025, the Departments of Labor, Health and Human Services and the Treasury said they will not enforce the new provisions of the September 2024 final rule while they reconsider it. Their statement says the underlying statute still applies. States can add their own enforcement, as the Connecticut parity law shows.
Check 2: does 42 CFR Part 2 reach your practice?
Among federal rules for behavioral health, Part 2 protects records of substance use disorder (SUD) treatment, and it applies to a “part 2 program,” not to every practice. The federal regulation defines that as a federally assisted program that provides SUD diagnosis, treatment or referral. Federal assistance can include Medicare participation or a federal registration, so a practice that treats SUD should ask counsel whether it qualifies.
HHS says its 2024 final rule lets a patient give one consent for future treatment, payment and health care operations, and lets HIPAA covered entities that receive the records redisclose them under HIPAA. SUD counseling notes still need separate consent, and the rule says segregating Part 2 records is not required. The compliance date was February 16, 2026.
Check 3: the Medicare fee schedule, a payer rule
The Medicare Physician Fee Schedule sets what Medicare pays for each service. Among the federal rules for behavioral health, it is the one that changes every year. CMS proposed its 2027 version on July 14, 2026, and the proposal is not final. The proposal would change rates and finish the psychotherapy payment phase-in, but nothing is final. Check CMS’s fee schedule page before you change any budget.
How the rules differ by payer type
Private payers
Commercial contracts set your rates, authorization rules and appeal windows. Parity affects the plan’s limits, not your contract rate. Keep your underpayments log current and watch the remittance for pattern changes. See electronic remittance advice for how to read it.
Medicare and Medicaid
Medicare pays under the Physician Fee Schedule. Medicaid is run by each state, with its own rates and billing rules. Federal parity provisions reach certain Medicaid managed care plans, but your state’s Medicaid manual is the rule you bill by.
State rules
State insurance laws can add to the federal floor, and they differ. Check your state insurance department and Medicaid agency for your state’s rules. Do not assume another state’s rule applies to you.
Do federal rules for behavioral health apply the same way to every practice?
No. A hospital and a solo practice face the same statutes but different applicability tests, especially under Part 2, which turns on whether you run a federally assisted SUD program. Ask counsel or your compliance officer how each rule applies to your practice, not to practices in general.
What to do Monday morning
- Record, for each patient, whether the plan is fully insured or self-funded. Our insurance verification routine has a place for it.
- Ask counsel whether any of your services make you a Part 2 program, and write down the answer.
- Keep a log of behavioral health denials and authorization delays with date, payer, code and reason.
- List your top Medicare codes and check them in the CMS look-up tool before you plan 2027.
- Add the billing terms glossary and this list of federal rules for behavioral health to your staff reading list.
The short version: federal rules for behavioral health
Federal rules for behavioral health come down to three checks: parity binds plans and its newest provisions are not being enforced, Part 2 applies only to certain SUD programs, and the Medicare fee schedule changes every year. Ask counsel about scope and log what you see.
How MCM South helps
MCM South Medical Billing Service, LLC bills exclusively for mental and behavioral health, for psychotherapists and psychiatrists in solo and medium-size practices. We bill out-of-network claims for clients. See who we serve to learn which practices we work with.
Keep going
Related reading
Want help keeping up with payer changes? We can talk through your practice.
FAQ
Does the federal parity law require plans to cover mental health care?
Not by itself. CMS explains that MHPAEA bars less favorable limits on mental health and substance use benefits when a plan offers them. The Affordable Care Act separately requires that coverage in non-grandfathered individual and small group plans.
Is the 2024 parity rule in effect?
The Departments said on May 15, 2025 that they will not enforce its new provisions while they reconsider it. The underlying parity law still applies.
Does 42 CFR Part 2 apply to my therapy practice?
Only if you are a part 2 program, which means a federally assisted program that provides SUD diagnosis, treatment or referral. Ask counsel to decide that for your practice.
Are the 2027 Medicare rates final?
No. CMS proposed the 2027 fee schedule on July 14, 2026. Check CMS for the final rule before you make decisions.
Where MCM South works
MCM South Medical Billing Service, LLC works with psychotherapists and psychiatrists in our ten currently served states: Georgia, Massachusetts, Connecticut, Texas, Florida, New York, Colorado, Tennessee, North Carolina and Illinois. We serve solo and medium-size practices that bill mental and behavioral health. Founder Michael Williams has worked with insurance payers in all 50 states. Browse the state and regional billing guides for rules that vary by state, or see our billing services.
This post is operational guidance for billing, not legal advice. Rules change, so confirm with the payer or your counsel.
