Occupational Therapy Billing & Coding Guide
OT eval 97165-97167, therapeutic activities, ADL training, modifier GO for OT plan of care.
Common Occupational Therapy CPT Codes
Ranked by claim frequency, with current MPFS work RVUs and global periods.
| Code | Description | Work RVU | Total RVU | Global |
|---|---|---|---|---|
| 97165 | Ot eval low complex 30 min | 1.54 | 3.01 | XXX |
| 97166 | Ot eval mod complex 45 min | 1.54 | 3.01 | XXX |
| 97167 | Ot eval high complex 60 min | 1.54 | 3.01 | XXX |
| 97168 | Ot re-eval est plan care | 0.96 | 2.05 | XXX |
| 97110 | Therapeutic exercises | 0.45 | 0.87 | XXX |
| 97112 | Neuromuscular reeducation | 0.50 | 0.98 | XXX |
| 97129 | Ther ivntj 1st 15 min | 0.50 | 0.67 | XXX |
| 97130 | Ther ivntj ea addl 15 min | 0.48 | 0.63 | ZZZ |
| 97140 | Manual therapy 1/> regions | 0.43 | 0.83 | XXX |
| 97150 | Group therapeutic procedures | 0.29 | 0.54 | XXX |
| 97530 | Therapeutic activities | 0.44 | 1.05 | XXX |
| 97535 | Self care mngment training | 0.45 | 0.97 | XXX |
| 97537 | Community/work reintegration | 0.48 | 0.96 | XXX |
| 97542 | Wheelchair mngment training | 0.48 | 0.93 | XXX |
| 97755 | Assistive technology assess | 0.62 | 1.13 | XXX |
| 97760 | Orthotic mgmt&traing 1st enc | 0.50 | 1.38 | XXX |
| 97761 | Prosthetic traing 1st enc | 0.50 | 1.21 | XXX |
| 97799 | Unlisted physcl med/rehab px | 0.00 | 0.00 | XXX |
What Occupational Therapy practices are leaving on the table
High-value services that consistently get under-billed across the specialty. Each one is rooted in current 2026 fee schedule and policy updates.
Under-billed re-evaluation (97168): Many practices bill 97168 only at discharge, missing intermediate re-eval billable at 60+ days post-initial if treatment plan changes or new functional limitation identified. Typical impact: 1-2 additional re-evals per patient episode = $150-300 per patient per year. Workflow: document functional reassessment at 45-60 day mark; if new goal or regression found, bill 97168.
Assistive technology assessment (97755) not captured: OT often delivers AT recommendations verbally without formal code billing. 97755 (0.62 RVU) captures equipment assessment, trial, training, and recommendation. Impact: $50-80 per assessment. Workflow: create simple AT checklist in OT note when equipment (grab bars, reacher, adaptive utensils, orthotic) is trialed; bill 97755 separately if distinct session or block time.
Modifier 51 multiple procedures bundling: Practices often bill only 97110 when session includes 97110 + 97140 + 97530. Payers reimburse primary at 100%, secondary/tertiary at 50%; omission leaves money on table. Impact: $40-120 per claim depending on payer contraction. Workflow: document three distinct time blocks (e.g., 0-15 min exercise, 15-25 min manual therapy, 25-30 min functional activities); code all three with 51 appended to secondary/tertiary.
Group therapy (97150) under-utilized: Practices default to individual codes; group session (2-4 patients) reimbursed at lower RVU (0.29) but counts toward multiple patients. Impact: $30-60 per patient per group session vs. zero if not billed. Workflow: designate 1-2 weekly group OT slots for functional/community activities; bill 97150 for all participants with matching documentation of group activity and individual functional goal attainment.
Code pairs that auto-bundle to CO-97
From the National Correct Coding Initiative for Occupational Therapy. The rationale tells you when a modifier legitimately bypasses the edit and when it cannot.
97129 is first 15 min; 97130 is each additional 15 min. These are time-based and inherently bundle. Use 97130 only when documentation clearly shows distinct additional 15-min blocks beyond the initial 97129. Modifier 59 does not separate time units of the same service.
97110 (therapeutic exercises) and 97112 (neuromuscular reeducation) often overlap in clinical delivery. Bundle unless documentation shows separate body regions, distinct treatment objectives, or separate time blocks. Modifier 59 requires clear anatomic or procedural distinction, not just intensity variation.
97530 (therapeutic activities) and 97537 (community/work reintegration) can both address functional goals. They bundle if the same activity session addresses both. Separate only if documentation shows distinct therapy session focused on one vs. the other on same day.
Initial evaluation (97165/97166/97167) and re-evaluation (97168) do not bundle within the same episode. Re-eval may be billed on same day as treatment only if medically necessary plan change documented. Most payers require minimum 60 days between initial and re-eval.
Modifier Guidance for Occupational Therapy
When each modifier legitimately applies in this specialty, with denial-pattern context and audit-defense documentation.
Modifier 25 allows billing an E/M visit (not in your OT code set) on the same day as OT procedures. Example: patient has established OT plan for stroke recovery, presents with acute complaint of worsening pain (new, separate E/M), then receives 97110 therapy. Bill E/M with 25 only if documented as distinct problem assessment and decision-making separate from the OT treatment plan.
Use modifier 59 only when two OT procedures are normally bundled but performed as distinct services. Example: 97110 and 97140 might bundle if used for same shoulder limitation, but if 97110 targets hand dexterity and 97140 targets shoulder range via manual therapy on different anatomic regions documented in separate timed blocks, append 59 to the second code. Requires granular time and anatomic documentation.
Modifier GO indicates service delivered under an outpatient OT plan of care. Required by Medicare for all OT services to trigger therapy plan of care rules. Must be appended to every OT CPT code (97129, 97110, etc.). Omission will trigger claim rejection or RAC audit for unbundled/unlicensed services.
Modifier KX certifies that medical policy requirements have been met (typically threshold visit limits or medical necessity thresholds). Some MACs and commercial payers require KX when OT visits exceed standard frequency (e.g., more than 3x/week). Check payer LCD or medical policy; when required, failure to append KX results in CARC 50 or 151 denials.
Modifier 51 applies when multiple distinct OT procedures are billed in one session. Example: 97110 (exercises) + 97140 (manual therapy) + 97530 (therapeutic activities) billed same day. Append 51 to the secondary and tertiary codes. Most payers reduce reimbursement by 50% for secondary procedures; document separate time blocks for each to justify multiple procedures.
Documentation requirements
What needs to live in the encounter note for these codes to survive a payer audit.
- Time blocks for each OT code billed: total session time, time per code (especially for 97129/97130 stacking), supports visit frequency and prevents bundling denials.
- Anatomic body region treated per code: hand/wrist vs. shoulder vs. trunk differentiates 97110 from 97140 and justifies multiple procedures same day.
- Distinct functional goal and objective achieved per code: explains why 97530 (therapeutic activities) differs from 97537 (work reintegration) in same session.
- Plan of care update or modification: required if re-eval (97168) billed within 60 days of initial eval; otherwise bundled as routine follow-up.
- Medical necessity for frequency and duration: OT over 3x/week or beyond 30 visits requires clinical rationale tied to measurable progress; supports KX modifier and withstands RAC frequency-of-service audits.
- Provider credentials and OT licensure: billing entity must be licensed OT or direct OT supervision documented; failure is primary RAC finding and results in 100% recoupment plus interest.
OIG and audit triggers in Occupational Therapy
Patterns that show up in OIG Work Plans, RAC audits, and CERT improper payment reviews. Build internal compliance checks around these.
RAC Pattern: OT frequency audits target visits exceeding payer norms without documented progress. Finding: claims for 3+ visits/week billed without measurable functional gain or plan modification. Defense: maintain session notes with specific measurable outcomes per visit (ROM improvement, ADL independence gain, assistive device mastery) tied to plan-of-care goals.
OIG Work Plan: Supervision and credential verification. Finding: billing under OT NPIs without active licensure verification or unlicensed aide delivering service. Defense: maintain current state licensure documentation, attestation of direct supervision if aide involved, and OT review/co-signature on chart notes monthly.
RAC Pattern: Bundling of 97110/97112 without anatomic or procedural separation. Finding: single claim with both codes, same time block, no documented distinct goals or body regions. Defense: time each code separately (e.g., 0-15 min hand exercises 97110, 15-30 min shoulder neuromuscular re-ed 97112), document distinct functional objectives.
CMS Policy: Plan of care requirement for all OT. Finding: initial eval (97165/97166/97167) billed without physician/ordering provider signature or plan documentation within 7 days. Defense: obtain signed plan of care from referring MD before billing eval; maintain attestation that OT credentials verified before service.
Payer-specific billing notes
Where the major payers diverge from generic Medicare rules in Occupational Therapy.
ME Medicare +
LCD varies by MAC region; most require physician referral within 30 days pre-service, signed plan of care before OT initiation, and 97165/97166/97167 eval within first visit. Prior auth not required nationally but some MACs (Palmetto, WPS) request medical necessity form for visits exceeding 15-20 per episode. CMS 2026 change: therapy services now subject to PEPPER outlier scrutiny; practices billing over 75th percentile visits/episode face RAC pre-claim audits. Append GO modifier mandatory; omission = automatic rejection.
UN UnitedHealthcare +
Optum delegates OT to local medical policy; typical limit 2x/week without prior auth, 30 visits per episode. Requires eviCore prior auth if stroke rehab or orthotic fitting exceeds frequency. UHC medical policy requires functional goal per visit and 10% measured improvement per 10 visits or plan modification. Denies 97129/97130 stacking beyond 45 min/session without KX modifier and clinical justification.
AN Anthem +
Uses ICR (Internal Claim Review) algorithm for frequency threshold 3x/week; auto-approves under 20 visits per episode, requests medical necessity documentation for 21-40 visits. Anthem AIM (Anthem Intelligent Management) requires prior auth for all evaluations (97165/97166/97167); missing auth = 100% denial. Anthem contracts often carve out 97755 (AT assessment) to durable medical equipment; verify before billing.
CI Cigna +
Medical policy caps OT at 30 visits per calendar year without exception; eviCore delegates orthotic/prosthetic coding (97760/97761). Requires documented medical necessity every 15 visits; does not recognize KX modifier effectively, so billing beyond 30 requires manual peer-to-peer. Cigna denies 97168 (re-eval) if billed within 30 days of 97165/97166/97167; enforces strict episode bundling. Prior auth required for all initial evals in many state plans.
Standard Occupational Therapy coding workflow
Step 1: Verify OT licensure and credentials for billing provider or supervising clinician; append GO modifier to all codes. Step 2: Identify primary diagnosis (ICD-10) and validate medical necessity against payer LCD or medical policy for covered conditions (stroke, hand injury, orthotic fitting, etc.). Step 3: Document distinct time blocks and anatomic regions for each CPT billed in session; if 97129/97130, count 15-min increments and ensure only one first-15 code. Step 4: Check payer frequency limits (Medicare 3x/week standard; UnitedHealthcare 2x/week typical); append KX if threshold exceeded and medical necessity documented. Step 5: Review claim pre-submission for modifier 51 (multiple procedures same day), modifier 59 (non-standard bundling separation), and plan-of-care status (new eval vs. re-eval vs. ongoing treatment) to avoid CARC 50, 151, and 97 denials.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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