Mental Health Claim Denied? Causes and Fixes

Mukesh MakwanaFounder & CEO · 8+ years hands-on in medical billing & RCM · Reviewed October 1, 2026

When a mental health claim is denied, the reason code usually points to one of five causes: the session time does not support the psychotherapy code billed, the clinician was not credentialed or eligible with that plan, an authorization was missing or exceeded, a telehealth claim had the wrong place of service or modifier, or the payer did not accept medical necessity. Read the code, match it to the cause, then correct and resubmit or appeal before the deadline.

Common mental health denial codes and what they mean

CARC	Official description (X12)	Typical mental health cause
B7	This provider was not certified/eligible to be paid for this procedure/service on this date of service.	Clinician not yet credentialed or effective with the plan.
185	The rendering provider is not eligible to perform the service billed.	Code billed under a license type the plan does not accept for that service.
197	Precertification/authorization/notification/pre-treatment absent.	Plan requires authorization after a set number of sessions, and none was obtained.
198	Precertification/notification/authorization/pre-treatment exceeded.	Sessions billed beyond the approved count or dates.
58	Treatment was deemed by the payer to have been rendered in an inappropriate or invalid place of service.	Telehealth session with the wrong place of service.
4	The procedure code is inconsistent with the modifier used.	Wrong or missing telehealth modifier for that payer.
50	These are non-covered services because this is not deemed a 'medical necessity' by the payer.	Documentation does not support continued treatment under the plan's criteria.
11	The diagnosis is inconsistent with the procedure.	Diagnosis code does not support the service billed.

Session time and the psychotherapy code

Psychotherapy codes are chosen by documented face-to-face time. Under CPT, 90834 is reported for 38 to 52 minutes and 90837 for 53 minutes or more. A 50-minute session billed as 90837, or a note with no start and stop times, invites a denial or a downcode on audit. When a prescriber delivers therapy during a medication management visit, the therapy is billed as an add-on to the E/M (90833, 90836 or 90838) with therapy minutes documented separately, never as a standalone psychotherapy code next to the E/M. For intakes, 90791 and 90792 are chosen by whether the clinician provides medical services. Our psychiatry billing page covers the E/M and add-on rules in more detail.

Credentialing and who may bill

Every rendering clinician must be credentialed and effective with the plan on the date of service, or claims deny as not eligible.
Plans differ on which license types they accept for which codes, and on whether pre-licensed clinicians can bill under a supervisor.
For Medicare, marriage and family therapists and mental health counselors have been able to enroll and bill directly since January 1, 2024; CMS does not grant them effective dates earlier than that.

See our credentialing services for therapists.

Eligibility verification (EV), benefits verification (BV), prior authorizations, and denial management at no cost for your first 30 days.

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Telehealth claims

For Medicare telehealth, CMS's telehealth FAQ (updated February 26, 2026) directs practitioners to use place of service 02 for telehealth provided other than in the patient's home and place of service 10 for telehealth provided in the patient's home, and notes that since January 1, 2024 Medicare pays telehealth services to patients at home at the non-facility rate. Commercial and Medicaid plans set their own telehealth place of service and modifier rules, so each payer's policy has to be loaded separately.

Medical necessity and continued treatment

Medical necessity denials are a smaller share of reported denials: in KFF's review of 2024 federal data for HealthCare.gov plans, lack of medical necessity was the stated reason for 5% of in-network denials where a reason was reported. In mental health they often arrive after many sessions, when a plan questions continued treatment. The answer is documentation: a current diagnosis, a treatment plan with measurable goals, progress against those goals, and why continued care is needed. Our guide to medical necessity denials covers the appeal.

What to do this week with a denied mental health claim

Read the reason and remark codes and note the appeal deadline.
Check the note: time, code, diagnosis, place of service and modifier.
Check the clinician's credentialing and effective date with that plan.
Check the authorization: number, sessions used, dates.
Correct and resubmit billing errors; appeal judgment calls with the treatment plan and progress notes.
Log the cause so the same denial does not repeat next month.

How Sterling Global Solution LLC prevents mental health denials

We verify benefits and session authorization rules before treatment starts, check each claim's code against the documented time, confirm the clinician's credentialing and the payer's telehealth rules, track authorizations by session count, and work every denial inside its deadline. See our behavioral health and therapist billing services, and start with our 30-Day Free Trial.

Frequently asked questions

Why are mental health claims denied?

Usually because the documented session time does not support the psychotherapy code, the clinician was not credentialed or eligible with the plan, an authorization was missing or exceeded, a telehealth claim had the wrong place of service or modifier, or the payer did not accept medical necessity.

What session length supports CPT 90837?

Under CPT, 90837 is reported for 53 minutes or more of psychotherapy, and 90834 for 38 to 52 minutes. The note should document the time.

Which place of service should be used for telehealth therapy with Medicare?

CMS directs practitioners to use place of service 10 when the patient is at home and place of service 02 when the patient is somewhere other than home. Commercial and Medicaid plans set their own rules.

What does denial code B7 mean for a therapy claim?

CARC B7 means the provider was not certified or eligible to be paid for the service on that date of service, usually because the clinician was not yet credentialed or effective with the plan.

Can mental health counselors bill Medicare?

Yes. Since January 1, 2024, marriage and family therapists and mental health counselors who meet CMS requirements can enroll in Medicare and bill directly.

Sources

X12, Claim Adjustment Reason Codes: CARC 4, 11, 50, 58, 185, 197, 198 and B7.
American Medical Association, CPT 2026 Professional Edition: psychotherapy time ranges and add-on codes.
Centers for Medicare & Medicaid Services, Telehealth FAQ, updated February 26, 2026: place of service 02 and 10 and home telehealth payment.
Centers for Medicare & Medicaid Services, MFT and MHC Provider Enrollment FAQs: Medicare enrollment from January 1, 2024.
KFF, Claims Denials and Appeals in ACA Marketplace Plans in 2024, March 24, 2026: share of denials for lack of medical necessity.

CPT® is a registered trademark of the American Medical Association. Payer rules vary. How we verify this guidance.