Common Psychiatry Billing Mistakes and How to Avoid Them (2026)

The most common psychiatry billing mistakes are choosing the wrong psychotherapy code for the time documented, misusing the psychotherapy add-on codes with E/M visits, attaching modifiers that are not needed (or missing the ones that are), weak medical necessity documentation and skipping benefit and authorization checks. Each one is preventable with clear rules and a short pre-billing review.

Psychiatry sits between two coding worlds: time-based psychotherapy codes and evaluation and management (E/M) services for medication management. Most denials and audit findings come from the seams between them. This guide explains the rules that actually apply, using CPT definitions and CMS guidance, and how to build checks that catch errors before claims go out.

Mistake 1: Picking the Psychotherapy Code by Session Length Instead of Documented Time

CPT defines psychotherapy codes by time ranges, and the time must be face-to-face with the patient and/or family member, with the patient present for all or part of the service. Scheduled session length does not count; documented start and stop times or total time do.

Psychotherapy of less than 16 minutes is not reported with these codes. A “50-minute hour” that was documented as 50 minutes is 90834, not 90837. Our mental health CPT codes guide covers the full code set, and our guide on how to bill for mental health therapy walks through session documentation.

Mistake 2: Misusing Psychotherapy Add-On Codes With E/M

A psychiatrist or other qualified prescriber who provides medication management and psychotherapy on the same day reports an E/M code (for example 99213 or 99214) plus a psychotherapy add-on code. The add-on codes 90833, 90836 and 90838 can only be reported with an E/M service; they are never billed alone and cannot be paired with stand-alone psychotherapy codes.

• The E/M must be significant and separately identifiable from the psychotherapy.
• Time spent on the E/M (history, exam, medical decision making) does not count toward psychotherapy time.
• If the E/M level is chosen by time, that time cannot overlap the psychotherapy time; many practices select the E/M level by medical decision making instead.
• The note should make both services visible, for example with separate headings and a separately documented psychotherapy time.

Crisis psychotherapy (90839 and 90840) has its own rules and is not reported with the other psychotherapy codes on the same day by the same provider. See our psychiatry denial management strategies for how payers apply these edits.

Mistake 3: Using Modifier 25 Where It Is Not Needed

Modifier 25 identifies a significant, separately identifiable E/M service on the same day as a procedure. Because the psychotherapy add-on codes are designed to be reported with an E/M, coding references such as AAPC’s Psychiatry Coding Alert note that modifier 25 is not needed on the E/M when the only other service is a psychotherapy add-on code. Some commercial payers still ask for it, so follow written payer policy where it exists.

Modifier 25 does matter when an E/M is billed on the same day as a separately reportable procedure, such as a psychiatric diagnostic evaluation (90791 or 90792) or an injection. Payers generally do not expect an E/M and a diagnostic evaluation on the same day by the same provider, so check NCCI edits and documentation before billing both. Modifier 59 or the X modifiers are only for overriding NCCI edits when services are truly distinct, not as a routine fix for bundling denials.

Mistake 4: Outdated Telehealth Modifiers and POS Codes

Telehealth rules vary by payer and change often, which makes it easy to keep using an old rule. For Medicare:

• Modifier GT is no longer used on professional claims; First Coast lists it as allowed only on institutional claims from critical access hospitals billing under method II.
• Place of service 10 is used when the patient is at home, and POS 02 when the patient is somewhere other than home.
• Modifier 93 identifies audio-only services, which Medicare allows for mental health services to patients at home when the patient cannot or does not consent to use video.
• Modifier 95 is required only in specific situations, so follow current CMS and MAC instructions for the date of service.

Commercial plans and Medicaid programs set their own POS and modifier requirements. Keep a payer-by-payer telehealth grid and review it at least yearly.

Mistake 5: Documentation That Does Not Show Medical Necessity

Payers deny or recoup psychiatry claims when the record does not support the diagnosis, the service and the time billed. A note that supports payment usually includes:

• The current diagnosis, coded to the highest specificity supported in ICD-10-CM.
• Symptoms and functional impact that justify the visit.
• The type of psychotherapy and the interventions used, and the patient’s response.
• Psychotherapy time (or start and stop times), separate from any E/M work.
• Progress toward goals in the treatment plan, and the plan going forward.
• A signature and date that meet payer requirements.

Our mental health ICD-10 codes guide covers diagnosis specificity.

Mistake 6: Skipping Benefit, Network and Authorization Checks

Behavioral health benefits are often carved out to a separate managed behavioral health organization, with its own eligibility, visit limits and authorization rules. Common front-end errors include billing the medical plan instead of the behavioral health carve-out, missing an authorization for intensive services, and continuing sessions after an authorization expires. Verify eligibility, the responsible payer, network status and authorization requirements before the first visit and at regular intervals after.

Worked Example: Medication Management Plus Psychotherapy

An established patient with major depressive disorder sees a psychiatrist. The psychiatrist reviews symptoms and side effects, adjusts the medication dose and documents moderate medical decision making. The psychiatrist then provides 30 minutes of psychotherapy, documented separately.

1. E/M level. Selected by medical decision making: 99214 (moderate MDM).
2. Psychotherapy add-on. 30 minutes falls in the 16–37 minute range, so +90833.
3. Modifiers. None needed for the E/M and add-on pairing under CPT design; check whether this payer has a written exception.
4. Claim. 99214 and 90833, both linked to the depression diagnosis, with the psychotherapy time documented in the note.

If the same psychiatrist had documented 52 minutes of psychotherapy with no E/M, the correct code would be 90834, not 90837.

A Pre-Billing Checklist for Psychiatry Claims

• Psychotherapy time is documented and matches the code’s time range.
• Add-on codes appear only with an E/M, and E/M time is not counted twice.
• Modifiers match payer policy, not habit.
• Telehealth claims use the right POS and modifiers for the payer and date of service.
• Eligibility, responsible payer and authorization are confirmed.
• Diagnosis codes are specific and supported by the note.

Frequently Asked Questions