Physical Medicine & Rehabilitation Billing & Coding Guide
Inpatient rehab admit, EMG/NCS in PM&R setting, prosthetic management coding.
Common Physical Medicine & Rehabilitation CPT Codes
Ranked by claim frequency, with current MPFS work RVUs and global periods.
| Code | Description | Work RVU | Total RVU | Global |
|---|---|---|---|---|
| 97161 | Pt eval low complex 20 min | 1.54 | 2.93 | XXX |
| 97162 | Pt eval mod complex 30 min | 1.54 | 2.93 | XXX |
| 97163 | Pt eval high complex 45 min | 1.54 | 2.93 | XXX |
| 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 |
| 99221 | 1st hosp ip/obs sf/low 40 | 1.63 | 2.23 | XXX |
| 99222 | 1st hosp ip/obs moderate 55 | 2.60 | 3.50 | XXX |
| 99223 | 1st hosp ip/obs high 75 | 3.50 | 4.68 | XXX |
| 99231 | Sbsq hosp ip/obs sf/low 25 | 1.00 | 1.32 | XXX |
| 99232 | Sbsq hosp ip/obs moderate 35 | 1.59 | 2.11 | XXX |
| 99233 | Sbsq hosp ip/obs high 50 | 2.40 | 3.20 | XXX |
| 99238 | Hosp ip/obs dschrg mgmt 30/< | 1.50 | 2.24 | XXX |
| 99239 | Hosp ip/obs dschrg mgmt >30 | 2.15 | 3.19 | XXX |
| 95860 | Needle emg 1 extremity | 0.94 | 3.58 | XXX |
| 95861 | Needle emg 2 extremities | 1.50 | 4.85 | XXX |
| 95863 | Needle emg 3 extremities | 1.82 | 6.60 | XXX |
| 95864 | Needle emg 4 extremities | 1.94 | 7.20 | XXX |
| 95867 | Ndl emg cranial nrv musc uni | 0.77 | 3.21 | XXX |
| 95885 | Musc tst done w/nerv tst lim | 0.34 | 1.93 | ZZZ |
What Physical Medicine & Rehabilitation 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.
Occupational therapy evals (97165-97167) are under-billed in inpatient rehab. Average reimbursement $180-220 per eval; most facilities default to PT-only and miss OT eval on admission. Add OT screening at admission to identify ADL/fine motor deficits; capture 1-2 OT evals per patient stay. Impact: $300-440 per patient, 20-30 patients/month = $6,000-13,200/month.
Modifier 25 under-utilization on E/M + modality same-day billing. Physicians see patient for medication management, then therapy modality applied; only 15% of practices append 25 to E/M. Educate providers that medication titration + therapy is separately identifiable; 25 adds 40-50% E/M reimbursement. Impact: $60-120/claim, 10-15 claims/week = $600-1,800/week.
Cranial nerve EMG (95867) rarely billed in isolation. Bell's palsy, trigeminal neuralgia, and post-stroke facial weakness patients warrant 95867; most coders skip it because it is not paired with extremity EMG. Yield: $200-280/code, 2-4 cases/month = $400-1,120/month.
Plan of care documentation under-captured for modality continuation. Therapy notes lack explicit frequency justification; insurers deny continuation weeks 4+. Implement template: 'Functional goal progress: ROM improved 15 degrees, pain reduced 2 points; frequency remains medically necessary; anticipated discharge week 6.' This single line defends 2-3 additional weeks of 97032 at $80-100/week = $160-300/patient.
Code pairs that auto-bundle to CO-97
From the National Correct Coding Initiative for Physical Medicine & Rehabilitation. The rationale tells you when a modifier legitimately bypasses the edit and when it cannot.
Needle EMG (95861) and muscle testing with nerve testing (95885) bundle on the same day for the same two extremities. Modifier 59 does NOT bypass this. Use 59 only if testing anatomically distinct nerve distributions (e.g., one extremity has radial nerve testing, other has median). Chart must show separate clinical indications for each nerve pathway.
PT eval (97161) and subsequent hospital visit (99231) on same day bundle unless the visit addresses a separate, unrelated medical issue requiring distinct E/M. Modifier 25 is appropriate if eval initiates rehab plan AND physician bill reflects new problem assessment (e.g., acute infection management separate from PT initiation).
Needle EMG codes are hierarchical by extremity count. You cannot bill 95863 (3 extremities) and 95864 (4 extremities) on the same date. Bill the highest level only. If 4 extremities tested, bill 95864 once; do not split.
Stimulation modalities (97032) and iontophoresis (97033) on the same body area on same date typically bundle. They are distinct modalities, so modifier 59 with documentation of separate anatomic sites or separate clinical problems (e.g., joint swelling vs. scar adhesion) is defensible. Requires separate line items with XS modifier acceptable if truly different structures.
Modifier Guidance for Physical Medicine & Rehabilitation
When each modifier legitimately applies in this specialty, with denial-pattern context and audit-defense documentation.
Use modifier 25 when a physician provides a significant, separately identifiable E/M service (99231-99233) on the same day as a procedure (95861, 97161). Example: Patient admitted for inpatient rehabilitation post-stroke. Physician bills 99231 for daily subsequent visit managing hypertension medication adjustment, PLUS 95861 for needle EMG of bilateral lower extremities to assess motor recovery. The E/M and EMG address different clinical purposes, documented in separate sections of the note. Append 25 to the E/M code.
Modifier 59 indicates distinct procedural service when codes normally bundle. In PM&R, use 59 sparingly. Example: 95863 (3-extremity needle EMG) and 95867 (cranial nerve EMG) on same date. EMG of extremities and cranial nerves are anatomically distinct; modifier 59 appended to 95867 is defensible if clinical documentation shows separate diagnostic questions (e.g., ruling out peripheral neuropathy AND facial nerve palsy from Bell's palsy). Without distinct anatomic or clinical separation, expect denial.
Modifier GP indicates services delivered under outpatient physical therapy plan of care. Required on 97161-97167 (evals) and 97032-97033 (modalities) when billed in outpatient PT setting. Omitting GP on PT evaluation codes in non-hospital outpatient setting invites denials for missing plan-of-care indicator. Always append GP to therapy evals and procedures in clinic-based PM&R when PT is the treating discipline.
Modifier KX certifies that medical necessity requirements specified in payer medical policy have been met. Medicare and many commercial plans require KX on high-frequency modality codes (e.g., multiple units of 97032 billed in one week) or when utilization exceeds standard guidelines. Attach KX documentation link (policy met, medical record supports frequency).
Left and right modifiers identify laterality on paired structures. Use LT/RT on 95867 (cranial nerve EMG unilateral) and on modality codes when applied to specific body side. Absence of LT/RT when bilateral treatment is documented creates coding ambiguity and may trigger audits questioning whether both sides were actually treated.
Documentation requirements
What needs to live in the encounter note for these codes to survive a payer audit.
- Distinct clinical indication for each code billed same date (e.g., 'EMG performed to assess median nerve conduction; separate PT eval to establish baseline strength/ROM for post-op protocol')—required to defend modifier 25 or 59.
- Time-stamped start/stop times for each modality unit (97032, 97033) per 15-minute increment—CMS audits modality minutes; vague 'modality applied' denies frequency claims.
- Specific muscles or nerve distributions tested in needle EMG (95861-95864), not 'EMG performed'; document actual needle insertions and sites—payers verify extremity count against billing level.
- Baseline and post-intervention measurement (ROM, strength, functional test) on eval and re-eval only—prevents bundling of sequential evals and supports medical necessity for therapy frequency.
- Plan of care documented at initial eval (97161-97167) with frequency/duration and functional goals—required by Medicare LCD; missing POC invites blanket denials of subsequent visits.
- Clinician credential (PT, OT, physician) and setting (inpatient, outpatient clinic, home health)—billing modifiers (GP, GO, GN) and E/M codes (99221-99239 vs. 97161-97167) depend on clinician type and place of service.
OIG and audit triggers in Physical Medicine & Rehabilitation
Patterns that show up in OIG Work Plans, RAC audits, and CERT improper payment reviews. Build internal compliance checks around these.
OIG Work Plan audits PE/PM practices for upcoding therapy evals (97163 vs. 97161). RACs query high-complexity claims without documented comorbidities or surgical complexity. Defend by linking eval code (low/mod/high) to actual medical decision-making documented (history complexity, multiple problem list items, extensive functional limitations).
Modality frequency audits (97032 billed 10+ units per week) flagged for medical necessity. CMS LCD caps most modality therapy at 2-3 weeks unless specific diagnosis (e.g., burn care). Defense requires physician sign-off on frequency, functional plateau justification, and payer-specific guidelines in medical record.
EMG coding (95861-95864) audited for extremity count mismatches. RAC compares EMG report to billed code; if report documents only 2 extremities but claim shows 95863 (3 extremities), automatic overpayment recoup. Require EMG provider to document all four limbs tested (even if brief, normal) or bill accurate count only.
Payer-specific billing notes
Where the major payers diverge from generic Medicare rules in Physical Medicine & Rehabilitation.
ME Medicare +
CMS LCD for PM&R (varies by MAC/region) typically limits modality therapy to 3 weeks acute, 8 weeks subacute unless documented justification (complex surgery, severe neurologic deficit). EMG requires medical necessity; routine screening EMGs on all admission patients risk denial. Prior auth not universally required but recommended for high-utilization cases (>15 modality units/week). 2026 update: CMS expanded coverage for post-stroke dysphagia treatment under SLP; PM&R practices can now coordinate SLP evals (GN modifier) with PT/OT without automatic bundling denial if documented as distinct impairments.
UN UnitedHealthcare +
UHC delegates PM&R prior authorization to Optum Care Partners. Therapy evals require 48-hour advance PA except inpatient admissions. UHC bundles E/M and therapy evals on same day without modifier 25 even if clinically distinct; use modifier 25 and appeal denials with clinical note separation. High-frequency modality (>2 weeks continuous) requires manual review; auto-approve first 2 weeks, then peer review. No modifier GP requirement, but Optum system flags missing POC documentation.
AN Anthem +
Anthem uses medical policy AIM (Audit, Integrity, Monitoring) for PM&R. Therapy evals must be billed with clinical complexity level documented (e.g., 'complex due to multiple diagnoses and functional limitations'); evals without documented complexity level auto-downcode to 97161 regardless of time. Anthem does NOT recognize modifier 59 for separating EMG codes; do not attempt to bill 95863 + 95867 with 59. Modality caps: 12 visits/month without PA. Prior auth turnaround 5-7 business days.
CI Cigna +
Cigna requires plan-of-care attachment at claim submission for all therapy evals; missing POC = 30-day hold and rework request. Cigna medical policy specifies that modality therapy beyond 4 weeks requires physician recertification letter in patient record (not just note documentation). No automatic bundling of eval codes on same day, but Cigna bundles 97032 and 97033 if both performed same date/body area; modifier 59 or XS required with separate site documentation. Commercial plans (non-Medicare Advantage) allow 2-3 prior authorizations per episode; plan ahead.
Standard Physical Medicine & Rehabilitation coding workflow
Step 1: Identify setting (inpatient hospital, outpatient clinic, home) and primary clinician (MD/DO, PT, OT, SLP) from claim header and note. Step 2: Determine if visit is initial eval or follow-up; if eval, assign 97161-97167 (outpatient PT/OT) or 99221-99233 (inpatient physician). Step 3: List all procedures/modalities performed; for EMG, count extremities and assign 95860-95864 hierarchy (bill highest level only). Step 4: Append modifiers (GP for PT clinic evals, 25 if separate E/M documented, 59 only if anatomically/clinically distinct). Step 5: Attach plan of care, timing documentation, and clinical rationale for modality frequency to claim; submit to payer with prior auth if required by policy.
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Verified against the CMS 2026 code set on May 31, 2026.
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