Physical Therapy CPT Codes 2027: Complete Billing Guide to Units, Modifiers & Denials

Your therapist treated the patient for 38 minutes. Your biller sent three units. The payer paid two. Repeated across a full schedule, that single unit is how outpatient rehab practices quietly lose five figures a year.

This guide covers the full physical therapy CPT code set used in outpatient rehab, the 8-minute rule that converts treatment minutes into billable units, the modifiers each claim needs, the ICD-10 and HCPCS codes that pair with them, every 2027 rule change, and the denial patterns that survive perfectly correct coding.

2027 raises the stakes. Medicare’s proposed conversion factor drops, the KX threshold climbs again, remote therapeutic monitoring may be rebuilt from the ground up, and Medicare telehealth for therapists enters the last year of its current extension.

Physical Therapy Billing Changes in 2027 at a Glance

Medicare proposes a lower conversion factor, a higher KX threshold and a final telehealth deadline of December 31, 2027. These are the numbers that decide your 2027 claims.

Note on 97110: the figure is the national non-facility amount at a geographic index of 1.0, before the multiple procedure payment reduction, calculated from CMS relative value files. Your locality will differ.

CMS released the CY 2027 Physician Fee Schedule proposed rule on July 14, 2026. Anything marked “proposed” can still change when the final rule is published, which is expected in November.

What Is a CPT Code for Physical Therapy?

A CPT code for physical therapy is the five-digit code that tells a payer exactly what your therapist did. Most sit in the 97000 series, with remote monitoring codes in the 98000s. The AMA maintains the code set and revises it every January 1.

Timed vs. Untimed Physical Therapy CPT Codes

The codes themselves are easy. The split underneath them is where claims break:

• Service-based (untimed) codes are billed once per date of service no matter how long the service took. Evaluations, hot packs, and mechanical traction fall here.
• Time-based (timed) codes are billed in 15-minute units of direct, one-on-one treatment. Therapeutic exercise, manual therapy, and gait training fall here.

Billing a timed code as if it were untimed leaves underbilled units on the table every single visit. Billing extra units without the minutes to support them invites a post-payment audit and a refund demand. Both outcomes come from the same gap: clinical documentation that never gets reconciled against what the biller submitted.

That reconciliation is where physical therapy billing sits apart from general medical coding services. You are not just coding a procedure. You are defending a clock.

CPT vs. ICD-10 vs. HCPCS: What Each Code Does on a PT Claim

Three code sets appear on every PT claim, and each answers a different question.

A procedure code the diagnosis does not support is one of the fastest routes to a medical-necessity denial, so the three layers must agree on every claim.

Most Common Physical Therapy CPT Codes (2027 List)

A core set of codes carries the most outpatient volume. Learn how each one is billed and most of your denial risk disappears.

None of these codes were among the headline changes in the AMA’s CPT 2027 release, but descriptors are revised every January 1. Use the AMA CPT code set as your source of truth.

97110 vs. 97530: Which Code Should You Bill?

Bill 97110 when the goal is a physical capacity such as strength, range of motion or endurance. Bill 97530 when the goal is functional performance in a real-world task. Quad sets on a table are 97110. Training a patient to stand safely from a low toilet seat is 97530.

Both codes can appear on one claim when each service is documented separately and the total timed minutes support both units. Choose by what the note shows, not by therapist habit. Payers watch utilization patterns, so a clinic that bills the two interchangeably without notes to explain it invites review. Either code needs a documented link to a functional goal in the plan of care.

How Does the 8-Minute Rule Work for Physical Therapy CPT Codes?

Add every minute of direct, one-on-one timed treatment in the visit. Divide the total, not each code separately.

Evaluation codes and untimed modalities stay out of that total. They are billed on their own.

Medicare follows this total-minutes method. Some commercial payers apply each code’s minutes separately instead, which can change the unit count, so confirm payer policy before you build a global billing rule.

Which Modifiers Do Physical Therapy CPT Codes Require?

Correct codes with missing modifiers still deny. These six decide whether the claim pays.

• GP: The service was furnished under an outpatient physical therapy plan of care. Leave it off a Medicare claim and the claim is rejected without review.
• KX: Attached once the patient’s allowed charges pass the annual therapy threshold, attesting that continued care is medically necessary. For 2027, CMS proposes raising that line from $2,480 to $2,540 for PT and SLP combined, with a separate $2,540 for OT. Allowed charges are counted at the Medicare fee schedule rate less any multiple procedure payment reduction, not at your billed charges. Claims above the threshold without KX deny automatically.
• CQ: The service was furnished in whole or in part by a physical therapist assistant beyond the 10% de minimis standard. It triggers a 15% payment reduction, so applying it where it is not required donates revenue.
• 59 (or XE, XP, XS, XU): Unbundles an NCCI edit pair. The classic pair is 97140 with 97530. Medicare allows it only when the two services occupy distinctly different 15-minute intervals, as the Palmetto GBA modifier guidance spells out. Overlapping blocks do not qualify, and different diagnoses are not justification.
• 95: Synchronous telehealth delivery. Medicare telehealth for PTs is authorized through December 31, 2027.
• 96 and 97: Habilitative versus rehabilitative, required by many commercial and marketplace plans.

Payer policy varies by state as well, so modifier logic belongs at the payer level rather than in one global setting. Regional references such as Texas medical billing or California guides show how those differences appear on real claims.

Which ICD-10 & HCPCS Codes Pair With Physical Therapy CPT Codes?

The CPT code says what you did. The ICD-10-CM code says why it was necessary. Unspecified diagnoses are one of the fastest routes to a medical-necessity denial.

ICD-10-CM codes seen most in outpatient rehab:

• M54.51 vertebrogenic low back pain and M54.59 other low back pain, far stronger than the generic M54.50
• M25.561 pain in right knee, M17.11 unilateral primary osteoarthritis, right knee
• M75.101 unspecified rotator cuff tear, right shoulder, not traumatic
• M62.81 muscle weakness (generalized), M62.830 muscle spasm of back
• R26.2 difficulty in walking, R26.81 unsteadiness on feet, R29.6 repeated falls
• S83.511A sprain of ACL of right knee, initial encounter
• M48.061 spinal stenosis, lumbar region, without neurogenic claudication
• I69.351 hemiplegia following cerebral infarction, right dominant side
• Z47.1 aftercare following joint replacement surgery, reported with the joint implant status code

Laterality and the seventh character are not optional. A right-knee protocol coded to an unspecified knee is a denial waiting for a reviewer.

New for FY2027 (dates of service on or after October 1, 2026):

• Plantar fasciitis has its own category. M67.A0- now captures it, with M67.A01 for the right foot, M67.A02 for the left foot and M67.A09 for an unspecified foot. M72.2- now describes plantar fascial fibromatosis, so plantar fasciitis claims still coded to M72.2 are out of date.
• R26.2 and R26.81 no longer exclude each other. The Excludes1 note between difficulty in walking and unsteadiness on feet became an Excludes2 note, so both can be reported when both are documented.

HCPCS Level II codes that belong on rehab claims:

• G0283: Unattended electrical stimulation, the Medicare substitute for 97014.
• G0281: Electrical stimulation for chronic Stage III and IV pressure ulcers.
• G0151: PT services in the home health or hospice setting, every 15 minutes.
• G2168: PTA services in the home health setting, every 15 minutes.
• G0541–G0543: Medicare caregiver training services. CMS asked for comment on their valuation in the 2027 proposed rule.
• E0730: TENS unit, four or more leads, with A4595 electrode supply.
• L1832: Knee orthosis, prefabricated and custom fitted.
• S8990: Maintenance therapy, recognized by many commercial plans and not by Medicare.

What Changed for Physical Therapy CPT Codes in 2027?

Six changes affect what you code, how you bill and what you collect this year. Medicare items below come from the CY 2027 proposed rule and are subject to the final rule.

1. The conversion factor falls, but therapy codes net slightly up

The one-year 2.5% increase Congress added for 2026 expires on December 31, 2026. As a result, CMS proposes a 2027 conversion factor of $32.84 for clinicians outside a qualifying advanced payment model, which covers most private practices. That is a 1.68% cut. Qualifying participants would see $33.17, a 1.19% cut.

Therapy is partly cushioned. CMS proposes practice expense changes that phase out the indirect practice cost index over two years and cap year-over-year practice expense RVU swings at 5% for codes that are not otherwise revised. CMS’s impact table estimates roughly a 3% rise in allowed charges for physical and occupational therapy from the RVU changes, which nets to about 1.3% once the lower conversion factor is applied. Averages hide code-level swings, so compare your top ten codes once final RVUs publish.

The 2.5% efficiency adjustment adopted for 2026 also stays in the proposed rule. Timed therapy services were exempted in the 2026 final rule, and CMS publishes the exemption list each year, so check how your untimed codes are treated when the final list appears.

2. The KX threshold rises and the review buffer narrows

The proposed KX threshold is $2,540 for PT and SLP combined, plus a separate $2,540 for OT, up from $2,480. The targeted medical review threshold stays at $3,000 for 2027 and, beginning in 2028, is updated annually by the Medicare Economic Index.

The buffer between “attest to necessity” and “expect a reviewer” shrinks from $520 to $460, roughly three or four visits for an average patient. Track accrual per patient, apply KX the moment the line is crossed, and watch RTM and other add-on services that accrue against the same total.

3. Remote therapeutic monitoring faces its biggest overhaul yet

The 2026 RTM codes, including 98979, 98984 and 98985, apply until a final rule says otherwise. But CMS has proposed conditions that could reshape how RTM is staffed and billed starting January 1, 2027:

• Established patients only. RTM would be limited to patients with an existing relationship with the billing practitioner.
• A separate initiating visit. A face-to-face visit, in person or by telehealth, would have to take place with RTM discussed. That visit can be billed separately.
• Direct employees only. Clinical staff time would count only if the staff are direct employees of the practitioner or practice, which ends payment for services run by third-party vendors.
• Lower valuations. CMS proposes revising the practice expense inputs behind several RTM codes.
• A possible code rewrite. CMS is seeking comment on replacing the current RPM and RTM code families with four new G-codes, including GRTM1 for initial setup and education and GRTM2 for monthly monitoring and management.

The comment period closed on September 14, 2026. Until the final rule publishes, avoid scaling vendor-staffed RTM programs.

4. Telehealth enters its final year of the current extension

The Consolidated Appropriations Act signed in February 2026 extended Medicare telehealth eligibility for PTs, OTs and SLPs through December 31, 2027. That makes 2027 the last year covered by current law. It is an extension, not permanence, and APTA continues advocating for a permanent fix. Build your telehealth volume with that expiry date in your plan.

5. CPT 2027 and ICD-10-CM FY2027 updates

The AMA released the CPT 2027 code set on September 9, 2026, effective January 1, 2027, with 299 new codes, 74 revisions and 80 deletions. Three updates matter for rehab practices:

• Biofeedback: A new time-based code structure takes effect. Pelvic health practices should review the new descriptors in the CPT 2027 codebook before January.
• Speech-language pathology: CPT 92507 is deleted and replaced by ten new time-based treatment codes. Multi-discipline clinics should update SLP charge masters.
• New 97xxx numbers are not PT codes. The new codes in that range, such as 97173 and 97180, describe adaptive behavior services. Check descriptors before you map them.

The ICD-10-CM changes that took effect October 1, 2026, including plantar fasciitis and the R26.2 and R26.81 note change, are covered in the ICD-10 section above.

6. MIPS holds steady, with an end date for traditional reporting

The MIPS performance threshold holds at 75 points for 2027. CMS proposes to sunset traditional MIPS after the 2028 performance year and move to MIPS Value Pathways. For therapists, CMS also proposes new body-region Functional Improvement measures for neck, upper extremity, back, lower extremity and knee impairments to replace the current Functional Status Change measures.

Practices tracking quality alongside revenue should align this with their MIPS reporting for 2027.

Why Do Physical Therapy Claims Get Denied Even With the Correct CPT Code?

Most rehab denials have nothing to do with the CPT code. They come from the layer around it.

• The plan of care certification expired. Medicare requires a certified plan of care and recertification at least every 90 days.
• A required progress note is missing. Medicare expects a progress report at least once every 10 treatment days.
• Documented minutes do not match billed units. Record total timed minutes and the minutes per code, then reconcile them before the claim goes out.
• CPT 97164 is used for routine follow-ups. Re-evaluation requires a documented change in condition or new clinical findings, not a scheduled check-in.
• MPPR reduced the payment. Medicare reduces the practice expense payment on the second and subsequent timed units billed on the same day. Expect it, and model it into your expected reimbursement.
• Medicare Advantage prior authorization was missing. Verify authorization requirements at scheduling, not at billing.
• A required ABN was not signed. Without it, you may not be able to bill the patient for a non-covered service.
• Diagnosis coding is out of date. Plantar fasciitis coded to M72.2 after October 1, 2026, or unspecified laterality, invites a medical-necessity denial.
• KX was missed. The threshold moves every year, so a hard-coded $2,480 will let claims through that should carry KX.

Conclusion

Physical therapy billing in 2027 will depend on accurate units, modifiers, diagnoses, documentation, and threshold tracking. Before January 1:

1. Match documented minutes to billed units.
2. Track the new KX threshold ($2,540, pending the final rule).
3. Update FY2027 ICD-10-CM codes.
4. Review RTM requirements before expanding vendor-staffed programs.
5. Track the Medicare telehealth authorization through December 31, 2027.

Getting these details right can prevent avoidable revenue loss.

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Frequently Asked Questions

How many units can be billed for a 60-minute physical therapy session?

Four units, when all 60 minutes are direct one-on-one timed treatment. Supervised modalities and documentation time do not count toward that total.

Can a PT bill an evaluation and treatment on the same day?

Yes. Evaluation codes 97161 through 97163 are untimed, and their minutes stay out of the timed-code total used for the 8-minute calculation.

What is the CPT code for dry needling?

20560 for one or two muscles and 20561 for three or more. Both sit outside the therapy code list, and Medicare generally does not cover them for PTs. Check payer and state-law rules before billing.

Does Medicare limit the number of PT visits per year in 2027?

No visit cap exists. Once allowed charges cross the KX threshold, proposed at $2,540 for 2027, the KX modifier is required on every subsequent claim line. Targeted medical review applies at $3,000.

Who can bill CPT 97110 besides a physical therapist?

Occupational therapists bill it under an OT plan of care with the GO modifier. Physicians and certain non-physician practitioners can furnish therapy under a plan of care with the matching therapy modifier. Chiropractic coverage varies by commercial payer, and Medicare does not pay chiropractors for it.

Are PT CPT codes updated every year?

Yes. The AMA publishes revisions each January 1, and CMS releases the annual therapy code list alongside the fee schedule. The CPT 2027 code set was released on September 9, 2026.

What is the Medicare conversion factor for physical therapy in 2027?

CMS proposes $32.84 for clinicians outside a qualifying advanced payment model and $33.17 for qualifying participants. The final figures are expected with the final rule in November.

Is Medicare telehealth for physical therapy still available in 2027?

Yes. Medicare telehealth eligibility for PTs, OTs and SLPs is authorized through December 31, 2027. Plan for the expiry date unless Congress extends it.