Physical Therapy E/M Coding and Billing

Overview

Physical therapy billing uses CPT codes 97110-97542 in 15-minute units. Evaluation codes: 97161 (low complexity), 97162 (moderate), 97163 (high complexity). The 8-minute rule governs unit billing: 8+ minutes of service equals 1 unit. Medicare imposes annual therapy caps combining PT, occupational therapy, and speech language pathology under a shared limit (approximately $2,210). Modifier 59 separates distinct therapy services on the same date. Prior authorization required by most commercial payers.

Coding Rules

PT codes bill by 15-minute unit increments using 8-minute rule. Document actual time on each service. Primary codes: 97110 (therapeutic exercises), 97112 (neuromuscular re-education), 97113 (aquatic therapy), 97140 (manual therapy), 97161-97163 (evaluation). Do not bill multiple codes for the same service on the same date. Medicare caps annual spending on combined PT/OT/SLP services at approximately $2,210 per beneficiary per calendar year. Exceptions available for medically necessary continued therapy.

Prior Authorization & Limits

Most commercial payers require prior authorization for PT. Medicare covers PT without initial authorization but applies annual spending cap. Some payers limit PT frequency (e.g., 2-3 times per week) or total sessions (e.g., 30 sessions annually). After reaching session limits, request medical necessity review with clinical documentation and progress notes. State workers compensation programs have varying PT coverage limits. Verify payer-specific limits before initiating treatment.

Bundling & Modifier Rules

Use modifier 59 to separate distinct therapy services (e.g., 97140 manual therapy and 97110 exercises) on the same date. Modifier 26 indicates professional component only when facility bills technical component separately. Do not bill evaluation (97161-97163) and treatment codes on the same date without modifier 25 on the E/M if applicable. Modifier 91 (repeat procedure) is not used for PT billing.

Documentation Requirements

Document specific therapeutic exercises, manual techniques, and modalities used. Record minutes spent on each service (exercises, manual therapy, neuromuscular re-education). Note patient response, functional limitations addressed, and progress toward goals. Include baseline functional status and changes at follow-up visits. Document any barriers to progress. For evaluations: comprehensive history, physical exam findings, and test results justify complexity level selected.

Common Questions