CPT 97110
Therapeutic Exercise, Timed
How it is billed
- Billed in 15-minute units of direct one-to-one patient contact; supervised exercise without the therapist present is not this code
- Under Medicare's eight-minute rule, units come from total timed-code minutes in the session: 8 to 22 minutes is one unit, 23 to 37 is two, 38 to 52 is three, and so on
- Minutes from all timed codes in the session are summed first, then allocated — billing each code's minutes independently and rounding each is the most common unit error
- Untimed services performed in the same session do not contribute minutes to the calculation
- Where the annual therapy threshold is exceeded, the modifier attesting medical necessity is required for continued payment
What the record must show
- Timed minutes per service, recorded so that total treatment time and total timed minutes are both derivable from the note
- The specific exercises, the body parts treated and the objective they serve — strength, endurance, range of motion or flexibility — since the code is defined by purpose rather than activity
- Objective measures showing progress toward functional goals, because continued medical necessity is what supports a course of treatment rather than any single session
A worked example
A patient receives 22 minutes of therapeutic exercise and 20 minutes of manual therapy in the same visit. Total timed minutes are 42, which is three units under the eight-minute rule.
Those three units are then allocated between the two services by their minutes: two units of therapeutic exercise and one of manual therapy, reflecting the larger share. Billing two units for each service — rounding 22 up and 20 up independently — claims four units where three were earned, and is the error most commonly found in therapy audits.
The same session without direct one-to-one contact for part of the time is shorter still. Minutes during which the patient exercised independently while the therapist treated someone else are not billable minutes for this code, however therapeutic the exercise was.
What decides payment
The eight-minute rule exists to stop a fifteen-minute unit being claimed for a few minutes of work, and it is arithmetic rather than judgement — which is why unit errors are the most reliably identified finding in any therapy review. Automated edits detect them without reading a note.
Multiple procedure payment reduction compounds the economics. When several therapy services are billed on one date, the practice expense component of the lower-paying ones is reduced, so a session's revenue is not the sum of its parts and unit inflation buys less than it appears to.
The therapy threshold that replaced the old hard caps still requires an attestation modifier past a dollar amount, and claims above a higher threshold face targeted review. Neither is a coverage limit, but both are workflow requirements that silently stop payment when missed.
Denials this code attracts
Modifiers that apply
Codes billed alongside or confused with this one
Billed most in — Physical Therapy · Orthopedics · Chiropractic
Terms used here — Medical Necessity · NCCI Edits · Modifier · Denial
How we handle it — Medical Coding · Denial Management · Practice Analytics
Primary sources
What the code-set maintainers and payers actually publish about billing 97110.
- Medicare Benefit Policy Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — What Medicare covers and under what conditions, as distinct from how a claim is processed. The starting point for any coverage or medical necessity question.
- Medically Unlikely Edits (MUE) tables (opens in a new tab)
Centers for Medicare & Medicaid Services — The maximum units of a code payable for one patient on one day. Unit-based denials usually trace to this table rather than to a coding error.
- Medicare Physician Fee Schedule lookup (opens in a new tab)
Centers for Medicare & Medicaid Services — Official allowed amounts by CPT/HCPCS code and locality. The reference point most commercial contracts are written against as a percentage.
Questions about CPT 97110
Therapeutic exercise to develop strength, endurance, range of motion or flexibility, delivered in direct one-to-one contact with the patient and billed in 15-minute units.
Total the minutes across all timed codes in the session, then convert: 8 to 22 minutes is one unit, 23 to 37 is two, 38 to 52 is three, and so on. Allocate the units to services by their share of the minutes.
Not under Medicare's rule. Rounding each service's minutes independently produces more units than the session earned, and it is the most reliably detected error in therapy billing because an edit can find it without reading the note.
No. The code requires direct one-to-one contact. Minutes in which the patient exercises independently while the therapist is occupied elsewhere are not billable minutes, however appropriate the exercise is.
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