90834 vs 90837: The Billing Difference (and the Revenue You May Be Losing)

90834 vs 90837: the one difference that matters

90834 and 90837 are both codes for individual psychotherapy. The clinical content can be identical. The only thing that separates them is documented session time:

• 90834 — an individual therapy session of 38 to 52 minutes.
• 90837 — an individual therapy session of 53 minutes or more.

That is the whole distinction. There is no "complexity" requirement and no special authorization for 90837 in most plans — if the session ran 53 minutes and you documented it, 90837 is the correct code.

Why the gap matters: about $53 a session

Because 90837 represents a longer session, it reimburses more. At 2026 Medicare rates, 90837 pays roughly $167 versus about $114 for 90834 — a gap of about $53 per session. Commercial payers differ, but the direction is always the same.

Across a full caseload, that difference is not small. A clinician who runs 53-plus-minute sessions but defaults to billing 90834 for, say, 20 clients a week can leave well over $10,000 a year in legitimate reimbursement on the table.

You can see the gap for your own state and weekly volume with the free therapy billing revenue-leak calculator.

The leak is documentation, not aggressive coding

Here is the part most billing guides get backwards. The goal is not to bill 90837 more often to earn more. That would be upcoding, and it is fraud.

The real leak runs the other way: a therapist genuinely provides a 53-minute session, but the note does not record the time, so on review it gets downcoded to 90834. The fix is not a bigger code — it is documentation. Record your start and end times, and the code you bill holds up.

So the honest summary is:

• Bill 90834 for documented 38–52 minute sessions.
• Bill 90837 for documented 53-plus-minute sessions.
• Never bill a longer code than the session you actually delivered and documented.

Don't forget the 90785 add-on

Separately from the 90834-vs-90837 question, CPT 90785 (interactive complexity) is an add-on you can bill alongside psychotherapy codes when specific factors complicate the session — using an interpreter, a caregiver whose behavior disrupts treatment, a sentinel event requiring mandated reporting, or high-conflict family dynamics. It pays a small amount per eligible session (roughly $15 at Medicare rates; commercial rates vary) and is frequently left off claims that qualify.

Bill what you document

The therapists who collect what they are owed are not the ones who code aggressively — they are the ones who document thoroughly, so the right code is defensible. If you want to see what correct coding is worth in your state, the free revenue-leak calculator estimates the gap from under-coded sessions and missed add-ons. For what insurers actually pay each code, see the therapy reimbursement benchmark, and browse all the free tools for private-pay therapists.

This article is for general informational purposes and is not billing, coding, or legal advice. CPT codes have specific time and documentation requirements; verify with your payer or a certified coder.