CPT 90853: Group Psychotherapy

Mukesh MakwanaFounder & CEO · 8+ years hands-on in medical billing & RCM · Reviewed September 29, 2026

Group psychotherapy is the most misunderstood unit in behavioral health billing. It is not timed, it is not billed per hour, and it is not billed per group. It is billed once per patient per session, and almost every 90853 problem traces back to a team that believed one of those three things.

What CPT 90853 covers

90853 is group psychotherapy, other than of a multiple-family group. Each participating patient generates one claim line under their own name and their own benefit. The group is not the billable unit; the patient in it is.

Its close relative is 90849, multiple-family group psychotherapy, for a group made up of families rather than individual patients. They are different codes for different formats and are not interchangeable.

Units and time: the rule that answers most questions

The NCCI policy manual is unusually direct here. The unit of service for 90849 and 90853 is each separate and distinct therapy session even if it lasts longer than one hour. These are not timed codes and must not be reported with a unit of service corresponding to any particular time interval. A practitioner may report only one unit of service on a single date of service.

There is one carve-out. An outpatient facility may report one unit for each separate and distinct group session, so a facility running genuinely distinct morning and afternoon groups is in a different position from a practitioner. And in a partial hospitalization or intensive outpatient programme, group therapy may be reported with either 90853 or the timed codes G0410 and G0411, which is a programme-level decision rather than a per-claim one.

CPT does not attach a minimum duration to 90853, but payers frequently do, and a group short enough to be questionable clinically will be questioned on review. Record actual start and stop times even though the code is not timed.

Documentation requirements

Group notes are where practices are most exposed, because the temptation to write once and paste for everyone is strongest.

• An individual note for every participant. A single shared group note does not support a claim for each patient.
• That patient's own participation, response and progress, not a description of what the group did.
• The link to that patient's treatment plan and diagnosis. Group membership is not a diagnosis.
• Group size and composition, and the modality or curriculum used.
• Start and stop times, even though the code is not timed.
• The clinician who led the group, with credentials.
• Where delivered by telehealth, the modality and the patient's location.

Identical notes across participants on the same date are the single clearest audit trigger on this code, and they are trivially detectable.

Common denials and the exact fix

Modifier rules

• 95: synchronous telehealth by real-time audio and video. Group psychotherapy is on the Medicare telehealth list.
• 93: synchronous telehealth by audio only, permitted for behavioral health.
• GT: retired for Medicare professional claims, still required by some Medicaid programmes and older commercial contracts.
• 59, XE, XP, XS, XU: for a genuinely distinct second service, most often individual therapy delivered in a separate time interval on the same date.
• Place of service: 11 in the office, 10 for telehealth to the patient's home, 02 for telehealth elsewhere.
• HQ: a group-setting modifier some Medicaid programmes require. Not a Medicare modifier, and where a state wants it, omitting it denies.
• No 26 or TC: PC/TC indicator 0.

Local coverage: is there an LCD for this code?

There is no national coverage determination for psychotherapy or psychiatric evaluation, so coverage is set locally and it differs by jurisdiction. Several Medicare Administrative Contractors publish a local coverage determination for psychiatric services together with a billing and coding article that carries the actual code list. Novitas Solutions, for example, maintains LCD L35101 (Psychiatric Codes, effective January 1, 2024) with billing and coding article A57130, which is where the covered CPT and HCPCS codes and the covered diagnoses actually live.

Two practical consequences. First, the diagnosis list that supports CPT 90853 in one jurisdiction may not support it in another, so the article to read is the one from the contractor that processes your claims. Second, LCDs and their articles are revised without much notice, which is why a claim that paid last quarter can deny this quarter with nothing changed on your side. Search the CMS Medicare Coverage Database by code and by your contractor, and re-check it when a denial pattern appears.

NCCI bundling edits

From the Medicare practitioner procedure-to-procedure file effective October 1, 2026.

• 90791 or 90792 with 90853: indicator 0. The evaluation and a group session cannot share a date.
• 90839 or 90840 with 90853: indicator 0. Crisis psychotherapy is not billed alongside a group session.
• 90853 with 90832, 90834, 90837, 90833, 90836 or 90838: indicator 1. Individual therapy may be billed with group therapy where it was separate, distinct and in its own time interval.
• 90853 with 90845, 90846, 90847, 90849 or 90865: indicator 1, listed as mutually exclusive, so a modifier is required and the documentation has to justify it.
• 90853 with 99202 to 99215: indicator 1. Unlike the individual psychotherapy codes, group therapy is not hard-blocked against an office visit, though the E/M still has to stand on its own.
• 90853 with 96127: indicator 0.
• 90853 with 97151, 97153, 97155 or 97156: indicator 0.
• 96156, 96158 or 96167 with 90853: indicator 0. Health behavior intervention and group psychotherapy do not share a date.
• 90880 with 90853: indicator 0.

What CPT 90853 pays

90853 carries the lowest work value in the psychotherapy family per claim line, which is the point: the economics of a group come from the number of participants, not from the rate. That also means an error on this code multiplies by group size every session.

2026 Medicare RVUs for CPT 90853

Source: CMS CY 2026 PFS Relative Value File, RVU26D (October release, published 08/26/2026). RVUs are national and unadjusted; commercial and Medicaid payers set their own rates and their own coverage.

In the 2026 CMS relative value file, CPT 90853 carries 0.67 work RVUs, with 0.91 total RVUs in a non-facility setting and 0.73 in a facility. The gap is practice expense: in an office the practice carries it, in a facility the facility does. Its PC/TC indicator is 0: CMS treats it as a physician service, so modifiers 26 and TC do not apply to it in any setting. Its global indicator is XXX: the surgical global period concept does not apply, so there is no postoperative period bundling other services into it. Across the family and group psychotherapy codes, work RVUs run from 0.67 (90849) to 2.86 (90847); 90853 sits at 0.67.

Units per day. Medicare's medically unlikely edit allows 1 unit of CPT 90853 per patient per day (a date of service edit set on clinical grounds, rationale: CMS policy). A second unit on the same date will not pay. MUE values are published quarterly in the Medicare NCCI practitioner services MUE table; the value above is from the table effective October 1, 2026.

To turn RVUs into payment, each component is multiplied by your locality's geographic practice cost index, the three are added, and the sum is multiplied by the 2026 conversion factor: $33.4009, or $33.5675 for qualifying APM participants (CMS-1832-F; CMS fact sheet). The CMS Physician Fee Schedule Look-Up Tool runs that calculation for your own locality.

Frequently asked questions

Sources

American Medical Association, CPT 2026 Professional Edition.
Centers for Medicare & Medicaid Services, CY 2026 PFS Relative Value File RVU26D (October release, published 08/26/2026): RVUs, PFS status indicator, PC/TC indicator and global indicator for 90853.
Centers for Medicare & Medicaid Services, CY 2026 Physician Fee Schedule final rule, CMS-1832-F: conversion factors.
Centers for Medicare & Medicaid Services, Medicare NCCI Practitioner Services medically unlikely edit table, effective October 1, 2026.
Centers for Medicare & Medicaid Services, Medicare NCCI procedure-to-procedure edits for practitioner services, 2026 Q4 file effective October 1, 2026.
Centers for Medicare & Medicaid Services, Medicare Coverage Database: Novitas Solutions local coverage determination L35101 (Psychiatric Codes, effective 01/01/2024) and billing and coding article A57130.
Centers for Medicare & Medicaid Services, National Correct Coding Initiative Policy Manual for Medicare Services, revision date 1/1/2026, Chapter XI (Medicine), Section C, Psychiatric Services.

CPT® is a registered trademark of the American Medical Association. Payer policy, NCCI edits and MUE values change quarterly, so check your own contractor and your commercial contracts before submission. How we verify this guidance.

Related codes

• CPT 90837. Individual psychotherapy, billable alongside a group session only when genuinely distinct.
• CPT 90791. The diagnostic evaluation, which cannot share a date with a group session.
• CPT 90792. The prescriber's evaluation, also blocked against group therapy on the same date.

Related reading

• Behavioral health & psychiatric billing. How we scrub session-based claims, track prior authorization and bill collaborative care.
• Psychotherapy add-on coding. How the add-on psychotherapy codes pair with an E/M visit and where the time rules bite.
• Behavioral health prior authorization in 2026. Why authorizations lapse mid-episode and what catching them early is worth.
• 2026 behavioral health code changes. What the CY 2026 fee schedule changed for collaborative care, digital mental health and telehealth.