97110 CPT Code: Therapeutic Exercise Billing Guide

The 97110 CPT code reports therapeutic exercise — strength, endurance, range-of-motion, and flexibility activities — billed in timed 15-minute units. It is the most frequently billed physical-therapy code, and because it is timed, the number of units depends on cumulative minutes under Medicare's 8-minute rule. Counting those minutes correctly, and pairing 97110 cleanly with other timed services, is what keeps these claims paid.

What is the 97110 CPT code? 97110 is the Current Procedural Terminology code for therapeutic exercise to develop strength, endurance, range of motion, and flexibility, billed as a timed service in 15-minute units.

Undeny's Take

97110 denials are almost never about whether the exercise was appropriate — they are about minutes and modifiers. The two recurring leaks are unit miscounts under the 8-minute rule and bundling edits when 97110 is billed with manual therapy (97140). Therapists who win these claims do two things: they document total timed minutes per service so the unit math is defensible, and they apply modifier 59 (or the X-series) only when 97110 and 97140 were genuinely separate, documented services. Sloppy time logs cost more revenue here than any coverage dispute.

What the 97110 Code Covers

97110 covers therapeutic exercises performed to develop strength and endurance, range of motion, and flexibility, delivered with direct one-on-one patient contact. It is a constant-attendance, timed procedure under a plan of care. It differs from therapeutic activities (97530), which involve dynamic, functional movements, and from manual therapy (97140), which is hands-on technique.

Units, the 8-Minute Rule, and Reimbursement

97110 is billed in 15-minute timed units, so the units depend on total minutes spent. Under Medicare's 8-minute rule, a single timed unit requires at least 8 minutes; cumulative timed minutes then determine the number of units (for example, 8–22 minutes is one unit and 23–37 minutes is two). Reimbursement follows each payer's fee schedule — Medicare from the code's RVUs on the Physician Fee Schedule. Use your contracted rate or the CPT estimator for a working figure.

Modifiers and Add-Ons

GP — services delivered under an outpatient physical-therapy plan of care (required by Medicare and many payers).
59 / XU — distinct service, when 97110 is correctly separate from a bundled timed code such as 97140.
KX — attests the service meets medical-necessity requirements where thresholds apply.

Common 97110 Denials

Unit count not supported by documented timed minutes (8-minute-rule errors).
Bundling edits with 97140 when no distinct-service modifier or documentation supports separation.
Missing therapy plan-of-care modifier (GP) or plan-of-care documentation.
Medical-necessity or frequency limits exceeded.

Related Codes

97110 is one of the core timed therapy procedures. 97530 is therapeutic activities, the functional-movement counterpart often billed alongside it. Browse the full set under CPT codes.

Frequently Asked Questions

What does 97110 cover?

97110 covers therapeutic exercise to build strength, endurance, range of motion, and flexibility, provided with direct one-on-one contact under a plan of care. It is billed as a timed service in 15-minute units.

How does the 8-minute rule apply to 97110?

Because 97110 is timed, you need at least 8 minutes to bill one unit, and cumulative timed minutes set the total units — roughly 8–22 minutes for one unit, 23–37 for two, and so on. Document total minutes to support the units billed.

What modifier does 97110 need?

Medicare and many payers require the GP modifier to show the service was furnished under a physical-therapy plan of care. Modifier 59 or an X-series modifier may apply when 97110 is a distinct service from a bundled code like 97140.

Why is 97110 denied with 97140?

97110 and 97140 hit a bundling edit, so billing them together without a distinct-service modifier and supporting documentation triggers a denial. Use modifier 59 only when the two services were genuinely separate and documented.

Informational only — not legal, medical, or billing advice. Always verify against current CPT guidance and your payer policy.

Estimate 97110 reimbursement

See typical units, the 8-minute-rule math, and reimbursement for 97110 in seconds. Try the CPT estimator · Browse CPT codes