Physical Therapy Billing Services for U.S. Healthcare Providers

Physical therapy billing runs on minutes. Timed codes, unit rules, plan of care dates, and visit limits all have to line up on every claim, for every visit, across a course of treatment that can run dozens of sessions. 360 Clinical Solutions runs the full revenue cycle for private practices, outpatient rehab centers, and multi-specialty clinics, so your claims reflect the care you delivered and your front desk isn’t buried in authorizations.

Physical Therapy Billing That Delivers Results

Therapy billing is a game of small numbers repeated many times. A patient comes in twice a week for eight weeks. Every visit has timed codes that depend on minutes. Every claim needs the right modifier. The plan of care has to be current, the authorization has to cover the visit count, and the copay has to be collected each time. Miss any one of them and a payable visit becomes a denial.

We handle all of it: verification, coding, claims, denials, payment posting, and A/R follow-up. Our experienced billing and coding team understands time-based CPT codes, therapy modifiers like GP and KX, and prior authorization requirements, and brings more than ten years of working experience. You get accurate claims, steadier cash flow, and more time for patient care.

Why Physical Therapy Billing Is Different

Most specialties bill for a visit. Physical therapy bills for minutes. Timed codes are counted in 15-minute units, and how many units you can bill depends on the total treatment time and the payer’s counting method. Two payers can look at the same session and allow different unit counts.

Then there’s the paper trail. A plan of care has to be established, certified, and kept current. Progress reports have to be written on schedule. Visit limits and authorizations run out mid-treatment. Medicare adds annual thresholds that change what documentation you need. And since therapy means so many visits per patient, small copays and balances become real money over a course of care.

None of it is mysterious. It just takes people who track it every single day.

Our Physical Therapy Billing Services

Insurance Verification & Prior Authorization

Coverage, visit limits, and approvals confirmed before the first visit, with renewals tracked as treatment continues.

Therapy CPT Coding & Modifiers

Accurate timed and untimed codes with GP, KX, CQ, and distinct-service modifiers applied correctly.

Unit & Time Calculation

Units checked against documented minutes, using the right counting method for each payer.

Plan of Care & Certification Tracking

Certification and recertification dates tracked so visits aren’t billed outside a valid plan.

Medicare Threshold Tracking

Annual therapy thresholds monitored so documentation requirements don’t catch you off guard.

Denial Management & Appeals

We find out why a claim was denied, correct it, and push the appeal through.

Payment Posting & Reconciliation

Every payment matched against what the contract says you should have received.

A/R Follow-Up & Collections

Aging claims worked until they’re paid, not reviewed once and forgotten.

How We Handle Your Billing

No black box. Here’s what happens to every visit, in order.

Intake & Verification

Payments are posted and compared to expected reimbursement. Denied or underpaid claims get corrected and resubmitted.

Evaluation & Plan of Care

We make sure the evaluation is coded correctly and the plan of care is documented and certified on time.

Charge Capture

Every timed and untimed service is captured with the minutes behind it, so units are supported.

Coding Review

Certified coders assign CPT and ICD-10 codes and modifiers from the documentation, not guesswork.

Claims Scrubbing

Claims are checked for units, modifiers, bundling edits, and authorization status before submission. This is where most denials get stopped.

Submission

Clean claims go to the payer electronically.

Payment & Denials

Payments are posted and compared to expected reimbursement. Denied or underpaid claims get corrected and resubmitted.

Reporting

You see claim status, visits remaining, collections, and A/R without having to ask.

Physical Therapy Billing, By Practice Type

Private Physical Therapy Practices

Owner-run clinics where every visit counts and billing can’t eat the clinician’s time.

Outpatient Rehabilitation Centers

Larger programs with multiple therapists, payers, and heavy visit volume.

Multi-Specialty Clinics With Therapy

Therapy lines inside larger practices, billed with rules that differ from the physician side.

Sports & Injury Rehab Clinics

High visit counts, with auto injury and workers’ comp mixed in alongside commercial plans.

Pelvic Health & Pediatric Therapy

Niche programs with their own coding, documentation, and payer rules.

Multi-Location Therapy Groups

Multiple clinics, therapists, and payer contracts run as one coordinated billing operation.

The 8-Minute Rule and Unit Billing, Explained

Timed therapy codes are billed in 15-minute units. Under Medicare’s 8-minute rule, you add up all the timed minutes in a session, then convert the total to units. Eight to 22 minutes is one unit, 23 to 37 is two, 38 to 52 is three, and so on. Many commercial payers use a different method, counting each code on its own and allowing a unit once you pass the midpoint. Same session, different unit counts. Add untimed codes like evaluations and some modalities, which don’t count toward the timed total, and the math gets easy to miss. We apply each payer’s counting method and check units against documented minutes before the claim goes out.

Plan of Care, Certification, and Medicare Thresholds

For Medicare, therapy needs a certified plan of care. The physician or qualified practitioner signs it within 30 days of the first treatment, and it has to be recertified at least every 90 days or when the plan changes. Progress reports are due at least every 10 treatment days. Miss one of these and the visits can be denied, even if the care was excellent. Medicare also sets an annual threshold above which services need the KX modifier and documentation of medical necessity. Many payers have their own versions of these rules. We track all of these dates so no visit gets billed outside a valid plan.

Modifiers That Matter in Therapy Billing

A handful of modifiers play an important role in therapy billing and can significantly affect claim processing. The GP modifier indicates services delivered under a physical therapy plan of care, while KX is used for services exceeding the Medicare threshold when medical necessity is properly documented. CQ identifies services furnished in whole or in part by a physical therapist assistant, and 59 or X modifiers may be required to indicate distinct services that would otherwise be bundled, such as manual therapy performed alongside therapeutic activities. The 95 modifier may be used for telehealth services when required by the payer. Because modifier requirements vary by payer, we incorporate each payer’s specific rules into our claim checks to help ensure accurate and compliant billing.

The Billing Problems That Actually Hurt Physical Therapy Practices

Unit Calculation Errors

Billing the wrong number of units, in either direction, creates denials or overpayment risk.

Expired Plans of Care

Visits outside a certified plan of care get denied, and appeals rarely succeed.

Visit Limits and Authorizations

Plans cap visits per year, and authorizations run out mid-treatment, often without warning.

Modifier Mistakes

A missing GP, KX, or CQ turns a payable claim into a denial or a reduced payment.

Bundling Edits

Payers bundle certain code pairs, and legitimate services get denied without the right modifier.

Uncollected Copays

A small copay across a long course of care becomes thousands of dollars in balances.

Physical Therapy Billing vs. General Medical Billing

They share a foundation, but therapy adds layers general billing never touches.

General Medical Billing

Standard visit and procedure claims, mostly one visit at a time.

Physical Therapy Billing

Time-based units, plan of care dates, visit limits, and therapy modifiers on every claim.

Medicare Therapy Billing

Certification and progress report rules, annual thresholds, and KX and CQ modifiers.

Why the difference matters

A biller who’s strong on general claims can still get therapy wrong, because the rules behind most therapy denials (units, plan of care dates, visit limits) barely exist in general billing.

Payers and Coverage Rules We Work With

Therapy practices bill commercial plans, Medicare, Medicare Advantage, and Medicaid, plus auto injury and workers’ comp carriers. Each has its own visit limits, authorization rules, and documentation standards, and Medicare Advantage plans in particular often require authorization that traditional Medicare doesn’t. State rules on direct access and referrals add another layer. We learn how each payer works and build it into your billing.

Signs It's Time to Get Billing Help

Most practices don’t switch billing partners because of one bad month. They switch because the same problems keep showing up. Sound familiar?

Why Practices Outsource This

Less Admin Work

Billing stops eating your front-desk and clinical staff’s time.

Fewer Errors

A dedicated coding and claims process catches what a generalist team misses.

Fewer Denials

Unit, modifier, and authorization checks happen before submission, not after rejection.

Faster Payment

Clean claims and consistent follow-up shorten the gap between service and payment.

Fewer Compliance Headaches

Someone else tracks payer policy changes so you don’t have to.

Therapists Stay Therapists

Less billing noise means more time with patients.

About 360 Clinical Solutions

360 Clinical Solutions is a medical billing and revenue cycle management company built for U.S. healthcare providers. Physical therapy is one of the specialties we serve. We handle patient information under HIPAA safeguards and keep claims moving so reimbursement stays predictable.

360 Clinical Solutions at a Glance

Company	360 Clinical Solutions
Industry	Medical Billing & Revenue Cycle Management
Service	Physical Therapy Billing Services
Audience	U.S. Physical Therapy Practices
Availability	Nationwide in the United States
Related Services	Medical Billing, Credentialing, Eligibility Verification, Medical Coding, Denial Management, Payment Posting

Frequently Asked Questions

What is the 8-minute rule and how does it affect physical therapy billing?

It’s Medicare’s method for converting total timed minutes into billable units. You add all timed minutes in a visit, then 8 to 22 minutes is one unit, 23 to 37 is two, and so on. Many commercial payers count differently, so we apply the right method for each.

How do you track Medicare therapy dollar thresholds?

We monitor each patient’s running total against the annual threshold, flag patients who are approaching it, and make sure the KX modifier and medical necessity documentation are in place before claims go out.

What happens if a plan of care isn't recertified on time?

Visits outside a valid certification can be denied, and those denials are hard to win. We track certification and recertification dates and alert your team before they lapse.

Do you bill for both timed and untimed CPT codes?

Yes. Evaluations, re-evaluations, and some modalities are untimed, while exercise, manual therapy, and activities are timed. We code both correctly and keep untimed services out of the timed minute count.

How do you handle billing for functional limitation reporting requirements?

Medicare’s old functional limitation G-code reporting ended in 2019, but payers still expect documented functional outcomes to support medical necessity, and some quality programs use outcome measures. We make sure the documentation supports each claim and follow any payer-specific reporting.

Can you bill for physical therapy delivered via telehealth?

Yes, where the payer covers it. Telehealth rules for therapy have changed repeatedly, so we confirm current coverage, modifiers, and place of service for each payer before billing.

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