Physical Therapy Medicare Audits and the Therapy Threshold

A physical therapy practice billing Medicare beyond the annual per-beneficiary threshold must add the KX modifier to confirm that the services are medically necessary. For calendar year 2026, the KX modifier threshold for physical therapy and speech-language pathology services combined is $2,480, and services above a second amount, $3,000, can be selected for targeted medical review. The stakes run past paperwork. A Medicare Administrative Contractor, a Recovery Audit Contractor, or a Supplemental Medical Review Contractor can, once a sustained or high level of payment error is found or education has failed to correct it, extrapolate a sample's error rate across the claim universe, and the projected overpayment can be recovered by recoupment or offset.

The CY 2026 KX Modifier and Medical Review Thresholds

Section 50202 of the Bipartisan Budget Act of 2018 repealed the hard dollar caps on outpatient therapy and replaced them with two per-beneficiary thresholds under Section 1833(g)(7) of the Social Security Act. The first is the KX modifier threshold: $2,480 for physical therapy and speech-language pathology combined, and a separate $2,480 for occupational therapy, for calendar year 2026, per CMS Transmittal 13437 and Change Request 14252, effective January 1, 2026. Claims submitted above that amount without the KX modifier are denied. The second is the targeted medical review threshold, set at $3,000 for each year before 2028. Not every claim above it is reviewed: HHS selects therapy providers for review using factors that may include a high claims denial percentage or aberrant billing. A Recovery Audit Contractor or a Supplemental Medical Review Contractor can also review therapy claims under its own program. Practices billing near either number should confirm exactly what any applicable local coverage determination requires the medical record to show.

Maintenance Therapy Under the Jimmo Standard

Medicare coverage of skilled therapy turns on the beneficiary's need for skilled care, not on whether the patient is expected to improve. The Jimmo v. Sebelius settlement, approved by the federal district court on January 24, 2013, confirmed that skilled therapy is covered when a therapist's clinical judgment is needed to maintain a patient's current function or to slow or prevent decline. CMS built that standard into the Medicare Benefit Policy Manual, Chapter 15. The audit risk lives in the gap between that legal standard and the documentation on file: therapy to carry out a maintenance program holds up only when the record shows why a skilled therapist, rather than a caregiver or a home exercise program, was necessary to perform it safely and effectively.

When the patient, a family member, a caregiver or unskilled personnel can carry out a maintenance program, Medicare does not cover a therapist's services to deliver it.

Treatment Note and Progress Report Quality

The Medicare Benefit Policy Manual directs contractors to consider the entire record, so that one missing item of documentation does not negate medical necessity when the record as a whole shows it. The manual also requires an initial evaluation, a certified plan of care, a progress report at least once every ten treatment days that assesses progress toward each goal, and a treatment note for each treatment day. A physician or non-physician practitioner must certify the plan within 30 calendar days of the first day of treatment, or later with a reason for the delay, and recertify it at least every 90 calendar days. When a therapist establishes the plan, the initial certification does not need a physician's or practitioner's signature if their written order or referral is in the patient's record and the plan was delivered to them within 30 days of the initial evaluation; recertification still requires a signature. CMS lists missing certifications and recertifications, missing total treatment time and missing or incomplete progress reports among the common outpatient therapy errors found in CERT audits. The timed code minutes in each treatment note must support the units billed, and these records are what a practice is expected to submit in response to an additional documentation request.

Why Early Legal Counsel Is Critical

Early legal intervention can shape how a practice responds to a contractor's request and preserve its appeal rights at every level.

How Health Law Alliance Can Help

Health Law Alliance handles Medicare audits from the initial document request through anything that follows, including Medicare Administrative Contractor medical reviews, Targeted Probe and Educate audits, Recovery Audit Contractor and Supplemental Medical Review Contractor audits, and the five-level appeal. Its Medicare audit defense team helps providers understand why they were selected for an audit and how to prove compliance with Medicare billing requirements.