Physical therapy billing codes describe the services reported to a payer. A usable claim also needs the appropriate diagnosis information, units, modifiers, provider details, and supporting record. Knowing a code number is useful; understanding why that code appears on a particular claim is what makes a billing review meaningful.
This guide helps practice owners discuss physical therapy billing and coding with their clinical and billing teams. It is a selected orientation, not a complete codebook or a recommendation to submit a particular code. Use current licensed code references and the applicable payer policy for final coding decisions.
Common physical therapy billing codes
The descriptions below are brief explanations in our own words, not full CPT descriptors. The table identifies selected service categories discussed in Medicare contractor article A56566. That article is contractor-specific; its detailed coverage rules should not be assumed to apply to every payer or jurisdiction.
| Code or family | Service category | Owner’s review question |
|---|---|---|
| 97161–97163 | Initial PT evaluation, with different complexity levels | Does the record support the selected evaluation level? |
| 97164 | PT reevaluation | What in the record supports a reevaluation? |
| 97110 | Exercise-based treatment | Is the purpose of the intervention explained? |
| 97112 | Treatment addressing movement control and coordination | Can the clinician explain the distinction from the other services? |
| 97116 | Treatment focused on walking function | Does the documentation describe the skilled work? |
| 97140 | Hands-on treatment techniques | Are the intervention and its purpose identifiable? |
| 97530 | Functional task-based treatment | Does the record explain the activity and its treatment goal? |
| 97535 | Training for self-care or managing daily needs | What skill was taught and why was skilled help needed? |
CPT is a registered trademark of the American Medical Association. Consult the current CPT reference for complete descriptors and instructions.
A code list does not establish that two services can be billed together or that a service is covered. APTA explains the role of CPT in reporting interventions and the importance of professional scope and payer policy in its coding-for-interventions guidance.
Distinguish the service, diagnosis, units, and modifiers
Think of a claim review as four separate questions:
- Service: what care does the procedure code represent?
- Diagnosis: does the reported diagnosis information accurately reflect the clinical record and relevant coding requirements?
- Units: what quantity is supported under that service’s unit basis and payer rules?
- Modifiers: is there a supported circumstance that needs an additional reporting indicator?
A correct answer to one does not resolve the others. For example, identifying a therapy service does not establish its duration. An authorization number does not establish that the submitted code matches the care provided.
Keep the clinical interpretation with the treating team. The billing workflow should surface specific questions rather than ask a biller to infer undocumented clinical facts. The owner’s billing guide maps the broader handoff from visit through reconciliation.
Timed codes and evaluation codes need different checks
For the selected treatment codes 97110, 97112, 97116, 97140, 97530, and 97535, time is part of the reporting basis. PT evaluation and reevaluation codes are not converted into 15-minute units using Medicare’s timed-treatment chart. Selecting an evaluation level also involves its required components, not simply choosing by appointment length. Refer to the contractor’s evaluation and treatment guidance.
For applicable Medicare timed services, review both the total eligible time and how units are allocated. Our physical therapy billing units and 8-minute-rule guide includes the chart and worked examples. For other payers, confirm the method instead of copying Medicare’s calculation automatically.
Modifiers answer different questions
A modifier is not a general fix for a rejected or denied claim. Start with what the modifier means and whether the actual record supports it.
| Modifier | What to verify |
|---|---|
| GP | Whether the service is being reported under a physical therapy plan of care and the payer requires this indicator. |
| KX | Whether the applicable Medicare therapy requirements above the threshold are met and supported by documentation. |
| CQ | Whether the Medicare rules for PTA participation require this indicator for the reported service. |
| 59 or an applicable X modifier | Whether a distinct-service circumstance meets the relevant edit and documentation criteria. |
CMS therapy guidance addresses therapy-specific reporting, including KX and assistant participation. Our denials hub explains the 2026 KX threshold in context. The GP plan-of-care indicator is described in CMS Chapter 5, section 20.1.
For code-pair edits, CMS says an appropriate modifier depends on qualifying circumstances and documentation. Two different code numbers are not, by themselves, enough to justify bypassing an edit. Use CMS’s guidance on modifiers 59 and XE/XP/XS/XU and the current applicable edit files.
Build a coding-question handoff that gets resolved
The most useful improvement may be a clearer path for questions rather than another reference sheet. Consider this hypothetical workflow:
A biller finds that a submitted unit count cannot be reconciled with the available treatment record. The biller records the discrepancy and asks a specific question. The treating clinician reviews the original record and supplies the appropriate clarification through the practice’s documentation process. The billing team then determines the supported claim action and records the outcome.
That workflow gives each person a defined job. It does not ask the clinician to justify a predetermined claim or the biller to create a clinical explanation.
Use a shared record with these fields:
| Field | What to record |
|---|---|
| Issue | The precise difference or missing information being reviewed. |
| Evidence | Where the authorized reviewer can find the relevant record and payer message. |
| Owner | The person who can answer the question. |
| Due date | When the answer is needed, with relevant filing or response deadlines. |
| Decision | What the review established and the supported next action. |
| Follow-through | Who checks that the correction or response reached its destination. |
Use approved systems for actual patient records. A public spreadsheet or informal sales conversation is not the place for that work record.
Questions to ask your billing company
Ask a prospective provider to explain how its team handles a code question from discovery to resolution. Request an example using fictional information. In particular:
- Who distinguishes a missing field from a clinical ambiguity?
- How are code-set and payer-policy updates maintained?
- Who reviews a proposed modifier change and its evidence?
- How do open questions appear in the practice’s reporting?
- How are recurring issues brought back to the practice for review?
Evaluate the response alongside service scope, access, reporting, and pricing using our PT billing company comparison checklist.
Bring recurring coding questions into a billing review
An owner does not need to memorize a codebook to insist on a clear process. Start by identifying which questions repeatedly delay claims and whether they concern documentation, payer requirements, system configuration, or task ownership.
William Avery provides physical therapy medical billing support. Book a 15-minute fit call with a summary of the issue, your practice setup, and your current system. Clinical decisions remain with your treating team.
Sources checked October 9, 2026. Requirements vary by payer, service date, and setting. This page does not establish coverage or payment for an individual claim.