Specialty Billing July 6, 2026 · 11 min read

Mental Health Billing Guide 2026: CPT Codes, MBHO Rules & Parity Laws

Mental health billing is more complex than most specialties — MBHO carve-outs, parity compliance, credentialing nuances, and constantly shifting telehealth rules make it easy to leave money on the table. This guide covers everything your practice needs to bill accurately and get paid in 2026.

Psychotherapy CPT Codes: The Complete 2026 Reference

The psychotherapy code family is time-based. Selecting the wrong code — or miscalculating session time — is the single most common coding error in behavioral health billing.

CPT Code	Service	Time Required	2026 Medicare Rate
90832	Psychotherapy, individual	16–37 minutes	~$85
90834	Psychotherapy, individual	38–52 minutes	~$122
90837	Psychotherapy, individual	53+ minutes	~$175
90847	Family psychotherapy (patient present)	50 minutes	~$131
90846	Family psychotherapy (patient absent)	50 minutes	~$112
90853	Group psychotherapy	Per session	~$35/patient
90785	Interactive complexity add-on	With any code above	~$22

Time documentation rule: Document the exact start and stop time of the psychotherapy portion of the visit — not the total appointment time. Medical record review and treatment planning time doesn't count toward psychotherapy time.

E&M + Psychotherapy Add-On Codes (Prescribers Only)

Psychiatrists and other prescribers who provide both medication management and psychotherapy in the same visit should bill an E&M code plus a psychotherapy add-on — not the standalone psychotherapy code. This is one of the most consistently underbilled combinations in behavioral health.

Add-On Code	Used With	Time	What It Captures
90833	99213, 99214, 99215	16–37 min psychotherapy	Brief therapy with med management
90836	99213, 99214, 99215	38–52 min psychotherapy	Standard therapy with med management
90838	99213, 99214, 99215	53+ min psychotherapy	Extended therapy with med management

Documentation requirement: The note must clearly separate medical decision-making (for the E&M) from the psychotherapy content. A single combined note that doesn't distinguish the two components won't support both codes on audit.

MBHO Carve-Outs: Navigating the Biggest Billing Trap

Many commercial health plans carve out behavioral health benefits to a separate Managed Behavioral Health Organization (MBHO) — companies like Optum Behavioral Health, Magellan Health, Beacon Health Options, and ComPsych. The medical plan and the MBHO are billed separately, and sending a behavioral health claim to the medical insurer is an automatic denial.

How to Identify Carve-Out Plans

During eligibility verification, check for a separate behavioral health phone number or payer ID on the insurance card
Run eligibility on both the medical plan and the behavioral health plan if listed separately
Ask the patient at intake: "Do you have a separate insurance card or phone number for mental health?"
Check the EOB after the first claim — carve-out denials often say "not covered under this plan — contact behavioral health"

Common MBHO Payer IDs (2026)

MBHO	Parent Plans	Clearinghouse Payer ID
Optum Behavioral Health	UnitedHealthcare, Oxford, some BCBS	87726
Magellan Health	Aetna, some Medicaid plans	MGLNBH
Beacon Health Options	Various commercial + Medicaid	BCNBH
ComPsych	Employer-sponsored EAP plans	COMPSY
New Directions Behavioral Health	Various regional plans	NDBH

Mental Health Parity Compliance in 2026

The Mental Health Parity and Addiction Equity Act (MHPAEA) requires that mental health and substance use disorder benefits be no more restrictive than medical/surgical benefits. In 2026, following the final MHPAEA rules issued in 2024, insurers face stricter scrutiny on non-quantitative treatment limitations (NQTLs) — things like prior authorization requirements, step therapy protocols, and network adequacy.

What this means for your practice: If a payer requires prior authorization for a 90837 but not for a comparable medical visit, that may be a parity violation. Document and appeal denials that appear to apply more restrictive criteria to behavioral health than to comparable medical benefits — these appeals have a strong basis under the law.

Filing a Parity Complaint

Request the plan's comparative analysis (required under the 2021 MHPAEA rules)
File with your state insurance commissioner if the payer refuses or the analysis is inadequate
For self-insured employer plans, file with the Department of Labor (dol.gov/mhpaea)
Document all communication — parity complaints require a paper trail

Telehealth Rules for Mental Health in 2026

Mental health telehealth expanded significantly during COVID and most expansions are now permanent or extended for 2026. Key rules:

Medicare: Audio-video psychotherapy services covered with no geographic restriction through December 31, 2026. Audio-only (telephone) covered for mental health when patient lacks video capability — document the reason
Place of service: Use POS 10 (patient's home via telehealth) for most mental health telehealth. POS 02 is for other telehealth originating sites
Modifier 95: Required on telehealth claims for most commercial payers. Some payers require GT instead — verify by payer before billing
State parity laws: Most states now require commercial payers to cover telehealth mental health at parity with in-person — check your state's rules as coverage scope varies
Prescribers: Prescribing controlled substances via telehealth still requires compliance with DEA special registration rules — confirm patient state and DEA schedule before prescribing remotely

Top 7 Mental Health Billing Denials and How to Prevent Them

#	Denial Reason	Root Cause	Prevention
1	Non-covered service	Claim sent to wrong payer (MBHO carve-out)	Verify behavioral health benefits separately at every visit
2	Authorization required	Sessions exceeded approved number or auth expired	Track auth units weekly; request extensions 2 weeks before expiry
3	Timely filing exceeded	Delayed submission after MBHO ID confirmed late	Submit to best-guess payer within 30 days; correct and resubmit quickly
4	Duplicate claim	Resubmitting without correcting original	Always use claim correction (frequency code 7) not a new claim
5	E&M not separately payable	90833 billed without supporting E&M documentation	Ensure MDM or time-based E&M documentation supports the level billed
6	Provider not credentialed	New clinician seeing patients before credentialing complete	Never see insurance patients until credentialing confirmed in writing
7	Telehealth modifier missing	Modifier 95 or GT omitted from telehealth claims	Build modifier into billing templates for all telehealth visit types

Group therapy billing alert: 90853 (group psychotherapy) is billed once per patient, not once per session. If you see 8 patients in one group session, you submit 8 separate claims — each for one unit of 90853. Billing one claim for the group is a common error that results in systematic underpayment.

Credentialing Nuances for Mental Health Providers

Mental health credentialing has unique complexity that differs from medical credentialing:

License types matter: Payers credential differently for MD/DO psychiatrists, licensed psychologists (PhD/PsyD), LCSWs, LPCs, MFTs, and NPs. Verify which license types each payer accepts before signing up patients
Supervision requirements: Some payers require that associate-level clinicians bill under a supervising licensed provider — know your payer's rules before billing independently
CAQH maintenance: Mental health providers often let CAQH attestations lapse, triggering credentialing delays. Set a calendar reminder to attest quarterly
Medicare enrollment: Requires a separate PECOS application and NPI enrollment. Social workers billing Medicare must have an LCSW — MSW alone is not sufficient

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Documentation Best Practices for Audit Defense

Mental health claims face higher audit scrutiny than most medical specialties. OIG and commercial payers both target psychotherapy claims — particularly high-volume providers billing 90837 exclusively. Protect your practice:

Document the specific start and stop time of the psychotherapy portion — not just the appointment time
Include a treatment plan that justifies ongoing sessions (diagnosis, functional impairment, treatment goals, expected duration)
Progress notes must reflect individualized care — templated notes that look identical session to session are a major audit red flag
For group therapy, document the group composition, therapeutic modality used, and each individual patient's participation and response
For 90847/90846 (family therapy), document clearly whether the patient was present or not — billing 90847 when the patient was absent is a common audit finding

Mental health billing rewards practices that get the details right. MBHO navigation, correct code selection, parity-aware appeals, and tight documentation all compound — practices that master these generate significantly more revenue per clinician hour than those treating billing as an afterthought.