Physical Therapy CPT Codes — Practitioner Reference

Accurate physical therapy billing services begin at the evaluation, which uses three complexity tiers under CPT 97161 (low complexity, ~20 minutes), 97162 (moderate, ~30 minutes), and 97163 (high, ~45 minutes). Re-evaluation is 97164 (~20 minutes). The complexity tier is driven by AMA criteria covering history, examination, clinical presentation, and clinical decision-making — NOT raw time. Commercial payers profile eval-tier distribution across a provider's new-patient mix, and a book weighted toward 97163 draws documentation requests; no payer publishes the mix threshold that triggers one, and we do not quote a number for it. Documentation must support the chosen tier with specific findings on each criterion. Practices that default to 97163 without supporting documentation get downcoded to 97162 on review; no payer publishes a downcoding rate, so we do not quote one. The 2017 evaluation code restructure also requires plan-of-care goals tied to functional outcome measures (LEFS, DASH, Oswestry, NDI) — payers increasingly require these scores at eval and re-eval for continued authorization.

These are the timed direct-contact codes: 97110 (therapeutic exercise), 97112 (neuromuscular re-education), 97116 (gait training), 97140 (manual therapy techniques), 97530 (therapeutic activities), 97535 (self-care/home management training), 97542 (wheelchair management training), and 97750 (physical performance test, each 15 minutes). Under the CMS 8-Minute Rule (Internet-Only Manual Pub 100-04, Chapter 5), units are calculated by total minutes of direct one-on-one time across all timed codes: 0-7 minutes = 0 units, 8-22 = 1 unit, 23-37 = 2 units, 38-52 = 3 units, 53-67 = 4 units, 68-82 = 5 units. Mixed remainders are allowed — a session with 9 minutes of 97110 and 9 minutes of 97140 totals 18 minutes (1 unit), allocated to the code with more minutes. Group therapy (97150) does NOT follow the 8-Minute Rule — it is billed as 1 unit regardless of duration, and cannot overlap with timed codes for the same patient at the same time.

Manual therapy (97140) and therapeutic activities (97530) are bundled under CMS National Correct Coding Initiative (NCCI) Procedure-to-Procedure edits when billed on the same date of service for the same patient. Without modifier 59 — or, more precisely since 2015, modifier XS (separate structure) or XU (unusual non-overlapping service) — the lower-paying code is denied as bundled. Documentation must show the services were performed on different anatomic structures or in distinct time blocks. Payers including UnitedHealthcare and Cigna audit modifier 59/XS use on PT claims and recoup payment when documentation does not support distinct services. The fix: structure the SOAP note to identify the body region treated by manual therapy versus the functional task addressed in therapeutic activities, and timestamp the transitions.

Modalities split into supervised (untimed, billed once per session) and constant-attendance (timed). Supervised modalities: 97010 (hot/cold packs — bundled by Medicare into the other services on the claim, never separately payable), 97012 (mechanical traction), 97014 (electrical stimulation, unattended — not a Medicare-recognized code; Medicare's code for unattended e-stim outside wound care is G0283). Constant-attendance modalities: 97032 (electrical stimulation attended, 15-min timed), 97035 (ultrasound, 15-min timed), 97039 (unlisted modality). Many practices still send 97014 to Medicare from old templates, on a code Medicare does not recognize; the fix is templating G0283 (supervised) or 97032 (attended, timed) instead. Commercial coverage of 97014 varies by plan and by contract — read the fee schedule loaded for each payer rather than assuming a rate.

The KX modifier signals to Medicare that services above the therapy threshold are medically necessary and the documentation supports continued treatment. The CY 2026 KX modifier threshold is $2,480 for PT and SLP services combined, with a separate $2,480 for OT services — CMS indexes the amount annually to the Medicare Economic Index, and the CY 2025 amount was $2,410. Above the threshold, KX is mandatory on every line; CMS denies claims over the threshold amount that are submitted without it. A second, lower-profile threshold sits at $3,000 for PT and SLP and $3,000 for OT — the targeted medical review trigger the Bipartisan Budget Act of 2018 retained, which CMS holds at $3,000 each year until 2028, when it begins indexing. Targeted means claims above $3,000 may be selected for review, not that all of them are. Documentation supporting KX usage must show: continued functional progress, an updated plan of care, and a justification for additional sessions. Practices that paste KX on every claim without supporting documentation face manual review and recoupment. Practices that fail to apply KX above the threshold have those lines denied outright; we have found no published figure for what that costs in aggregate and do not quote one.

Therapy plan-of-care discipline modifiers: GP (services delivered under outpatient PT plan of care), GO (OT plan of care), GN (SLP plan of care). These are mandatory on every therapy line for proper claim adjudication — missing them triggers immediate rejection. Telehealth: 95 modifier (synchronous via real-time interactive A/V) replaces the deprecated GT. POS 02 (telehealth provided other than at patient's home) and POS 10 (telehealth provided at patient's home) drive the fee schedule. Other PT-relevant modifiers: 22 (increased procedural services — rare), 76 (repeat procedure same provider), 77 (repeat procedure different provider), 59/XS/XU (distinct service for NCCI), CQ (PTA-rendered service, more than 10% of the unit — required for Medicare since 2022), CO (OTA-rendered).

Medicare requires a physician or NPP (nurse practitioner, physician assistant, clinical nurse specialist) signature on the PT plan of care within 30 days of the initial evaluation, per 42 CFR 410.61. Without the signed plan, all subsequent therapy claims are at risk of post-payment recoupment during a Targeted Probe and Educate (TPE) review. The plan must include: diagnoses, long-term goals, treatment frequency, treatment duration, and the type of services. Recertification is required every 90 days or sooner if the plan changes substantially. Commercial payers vary — Aetna and Cigna often follow Medicare's 30-day rule; BCBS plans frequently require initial plan signature within the first visit. We track every plan of care against its 30-day clock, route the signature request through the EHR's own transmission workflow rather than by hand, and report the unsigned list weekly; no one publishes a compliance rate for either approach, so we do not quote one.