Why behavioral-health claims get denied

You’ll read in a lot of places that behavioral-health claims are denied more often than medical claims. We’re not going to quote a rate here. We haven’t found a primary source that measures it cleanly across payers, and a number without a source isn’t worth much. What we can do is explain why these claims carry extra ways to fail. Most of it comes down to a handful of things.

Timed codes

The core psychotherapy codes are timed. A session is billed under one code if it ran a certain number of minutes and a different code if it ran longer. The note has to show the time, and the time has to match the code. If the note says “session” with no start and end time, a payer that audits the claim can deny it. Many practices lose money here simply because the template doesn’t prompt for time.

Add-on codes

When a psychiatrist does both a medication check and psychotherapy in the same visit, the therapy is billed as an add-on to the evaluation-and-management code. Payers apply edits to that pairing. If the add-on is sent without the base code, or the two aren’t linked correctly on the claim, it denies. This is one of the most common reasons a psychiatry claim bounces and one of the easiest to fix once you know to look for it.

Prior authorization

Some payers require authorization before certain behavioral-health services, and the rules vary by plan and by service. An authorization can also run out: it covers a set number of visits or a date range, and the practice keeps scheduling past it. The claim is then denied as “no authorization on file” even though one existed at the start of care.

Medical-necessity documentation

Payers expect the record to support the diagnosis, the treatment plan, and why this level of care is needed. For therapy that means a plan with goals and progress against them, not just a narrative of what was discussed. When the documentation doesn’t tie the visit back to the plan, a reviewer can deny the claim after the fact and ask for money back.

Telehealth rules

A large share of behavioral-health care moved to video. Telehealth claims need the right place-of-service code and, for many payers, a modifier. Those rules have changed several times in recent years, and they differ by payer. A claim that was fine last year can deny this year because a payer updated its telehealth policy and the practice-management system was never updated to match.

Clinician enrollment

In a group practice, each clinician has to be enrolled and linked to the group with each payer before their visits can be billed. A new therapist starts seeing patients while the enrollment is still pending, and every one of those claims denies. Fixing it later means re-submitting weeks of claims, some of which may now be past the payer’s filing deadline.

Carve-outs

Some health plans hand their behavioral-health benefits to a separate administrator. The patient’s card shows one company, but mental-health claims have to go to another. If eligibility isn’t checked for the behavioral-health benefit specifically, the claim goes to the wrong payer and comes back denied.

What to do with this

None of these are exotic. They’re the ordinary failure points of a specialty with more moving parts than a routine office visit. If you want to know which of them are hitting your practice, pull your denials by reason code for the last few months and sort by count. The top three or four reasons usually explain most of the total. That’s where the fix is.