CPT 90837 vs 90834: Time-Based Documentation Audit Risk

Across the roughly 50 behavioral health practices we work with at Revenant Care Group, CPT 90837 and CPT 90834 sit at the center of more post-payment audits, recoupment demands, and internal compliance failures than almost any other code pair in outpatient psychiatry and therapy billing. The gap between these two codes is exactly 23 minutes of documented face-to-face psychotherapy time, and that gap is costing practices real money when documentation does not hold up to scrutiny.

We are writing this because the pattern we keep seeing is not random. It is structural. Practices are routinely billing 90837 (53 minutes or more) without the documentation architecture to defend it, and when payers audit, the recoupment math gets painful fast. If you are a CFO or RCM director running a behavioral health group, this is the audit exposure you need to address before a payer requests records.

The Exact Time Thresholds and Why They Matter in 2026

CPT 90834 covers individual psychotherapy of 45 minutes, defined as 38 to 52 minutes of face-to-face time. CPT 90837 covers 60 minutes, defined as 53 minutes or more of face-to-face time. The 2026 Medicare physician fee schedule puts 90837 at approximately $175 to $185 nationally (varying by locality) versus 90834 at approximately $130 to $140. That reimbursement delta of roughly $40 to $50 per session sounds modest until you do the volume math.

A practice billing 90837 for 200 sessions per week and losing 30 percent of those to downcode on audit faces a retroactive liability of roughly $2,600 to $3,000 per week in overpayments demanded back, not counting interest and administrative cost. For a mid-size group with 10 to 15 clinicians, a 12-month lookback from a commercial payer or a Medicare Unified Program Integrity Contractor (UPIC) audit can produce recoupment demands in the $80,000 to $150,000 range based on the volume ratios we have seen.

What Triggers a 90837 vs 90834 Audit in the First Place

Payers use automated anomaly detection, and 90837 utilization ratios are a known trigger. When a single clinician or a practice bills 90837 at a rate significantly above the regional peer benchmark, the claim hits a worklist. For 2026, most commercial payers and Medicare Advantage plans have tightened their outlier thresholds. We are seeing practices flagged when their 90837 rate exceeds 70 to 75 percent of all individual psychotherapy claims, particularly in Place of Service 11 (office) and POS 02 (telehealth).

Telehealth deserves separate attention. Post-PHE, CMS extended many telehealth flexibilities through the end of 2025 and into 2026 under specific legislation, but payers have not relaxed documentation scrutiny for time-based codes delivered via telehealth. In fact, audio-visual session logs, platform timestamps, and clinician attestation of start and stop times have become a specific records request item when 90837 is billed under POS 10 (telehealth in patient’s home) or POS 02.

The Documentation Gaps We Actually Find on Audit Prep Reviews

When we pull records for practices preparing for or responding to a payer audit, the failures cluster around four specific documentation problems:

• No start and stop times recorded. The CPT time thresholds for 90837 require documented face-to-face time of 53 minutes or more. A progress note that says “60-minute session” without actual clock times is defensible in some cases but vulnerable in a technical audit. Many EHR templates do not default to capturing this field.
• Face-to-face time conflated with total encounter time. Coordination of care, documentation time, and collateral calls do not count toward the psychotherapy time threshold. We regularly see clinicians documenting total appointment duration rather than face-to-face therapy time, which creates a 90837 claim that cannot survive scrutiny.
• Medical Decision Making (MDM) add-on confusion. When a prescribing psychiatrist bills 90837 with the evaluation and management add-on code 90833, the time requirements and documentation standards are distinct from stand-alone 90837. We see this structure billed incorrectly in a significant share of integrated care practices.
• Inconsistent session length patterns. A clinician whose schedule shows 50-minute appointment slots but who bills 90837 on every claim creates a mathematical implausibility that audit tools flag immediately.

How Payers Recoup and What the Extrapolation Risk Looks Like

This is the part that most practice operators do not fully internalize until it happens to them. When a payer audits a statistically valid sample of claims and finds a documentation error rate, they apply that error rate to the full universe of claims in the lookback period through statistical extrapolation. A finding that 40 percent of a 50-claim sample cannot support 90837 billing becomes a 40 percent recoupment demand against every 90837 claim submitted over 12 to 36 months depending on the payer and the program.

For a practice billing $1.2 million annually with 60 percent of revenue tied to 90837, that extrapolated demand can reach $288,000 before the practice has an opportunity to submit individual claim-level appeals. The appeals process under most commercial contracts allows for redetermination, but the administrative burden is substantial and the timeline is measured in months. Proactive documentation correction and clinician training is a fraction of that cost.

The Modifier and POS Variables That Add Complexity

Several modifier and coding combinations interact with 90837 and 90834 in ways that increase audit surface area. Modifier 95 for synchronous telehealth is required by many payers when billing these codes via video, and missing it can trigger a claim-level denial that rolls up into a broader documentation review. Modifier GT, while largely phased out under Medicare, is still required by a subset of commercial and Medicaid managed care plans through 2026.

POS selection errors also create audit triggers independent of the time documentation issue. Billing 90837 under POS 11 for a session that platform logs show was conducted remotely creates a claim integrity problem that compounds the time documentation risk. For practices operating in multiple states or billing across multiple Medicaid managed care organizations, the POS and modifier requirements vary enough that a centralized billing review function is not optional.

If your practice also provides substance use disorder services, the documentation discipline required for time-based codes extends to your SUD billing profile. Payers increasingly pull SUD and BH claims together in a single audit request, which is why getting your coding infrastructure right across service lines matters. Our detailed breakdown of G0480 to G0483 drug screen coding and the revenue impact of under-coding is relevant context if you run an integrated BH and SUD program.

What a Defensible 90837 Documentation Standard Actually Looks Like

We recommend that every behavioral health practice billing 90837 build the following into its clinical documentation standard before the next payer request arrives:

• Discrete start time and end time fields in every progress note template, required at the EHR level, not optional.
• A clinician attestation statement that distinguishes face-to-face psychotherapy time from total appointment time, written into the note structure.
• For telehealth sessions, a platform-generated session duration log retained as part of the medical record, not just the clinician’s self-report.
• A quarterly internal audit sampling at least 20 to 30 claims per clinician, reviewed against the actual CPT time threshold, with a feedback loop to clinical staff.
• A written policy distinguishing when 90837 versus 90834 is appropriate, distributed to all billing and clinical staff and updated when CPT guidance changes.

Practices that have mental health parity challenges layered on top of documentation risk face compounded exposure. If your commercial payers are also applying non-quantitative treatment limitations to psychotherapy codes, that is a separate but related revenue recovery opportunity that we have written about in detail in our guide on MHPAEA parity appeals and how behavioral health practices are leaving money on the table.

Act on This Before Your Next Payer Records Request

The practices that manage 90837 audit risk well are not doing anything complicated. They have tight documentation standards, they run internal audits on a defined schedule, and they understand their utilization ratios relative to payer benchmarks. The practices that get hurt are the ones that assume a busy schedule and good clinical outcomes will protect them from a billing integrity review. They do not. If you want to understand your current exposure before a payer does, we offer a free 30-day denial audit for behavioral health practices. You can schedule a time to talk through your specific situation directly at our scheduling link, and we will come in with the data you need to make an informed decision about where your documentation risk actually lives.