Medicare physical therapy audits: what reviewers cite

Medicare paid physical therapists in private practice a projected $659.2 million it should not have in the 2024 reporting period, an improper payment rate of 15.8% on Part B claims. Those figures come from CMS’s provider compliance tip sheet for PTs in private practice, which the agency refreshed in February 2026 with the newest review data. The breakdown underneath the headline is the part worth pinning to the wall. Insufficient documentation caused 88.6% of those improper payments. Missing documentation entirely caused another 8.3%. Incorrect coding, the subject most compliance courses spend their hours on, caused 1.5%.

Reviewers are not catching PTs picking the wrong CPT code. They are recouping payment for visits that mostly did happen, because the chart cannot prove what the claim said.

Who reviews PT claims, and at what dollar amount?

Two dollar figures matter in 2026, and they do different jobs. The KX modifier threshold sits at $2,480 for PT and SLP services combined, per CMS’s therapy services page. Once a patient’s therapy spending crosses it, every further claim needs the KX modifier certifying medical necessity, and CMS is blunt about the consequence: claims over the threshold without the modifier are denied. No reviewer is involved in that denial. It is mechanical, and it fails silently if nobody is watching the running total. The threshold is proposed to rise to $2,540 next year, which we covered in our breakdown of the 2027 Medicare fee schedule.

The second figure is $3,000, the targeted medical review threshold, which holds at that amount until 2028, when it begins indexing to inflation. Crossing it does not trigger anything by itself. CMS notes that “not all claims exceeding the MR threshold amount are subject to review as they once were”; contractors select claims based on billing patterns, not on the raw dollar amount.

The reviews themselves mostly arrive through Targeted Probe and Educate, run by your Medicare Administrative Contractor. MACs use data analysis to pick providers with high claim error rates or billing that looks unusual next to their peers. CMS’s TPE page says most providers will never be selected, and that compliant billers are not chosen at all. The practices that are selected tend to already show up as outliers in the data before the first records request lands.

What do reviewers actually ask for?

Five artifacts, and CMS lists them on the same compliance tip sheet: the initial evaluation and any re-evaluations, the plan of care, the physician or NPP certification of that plan plus recertifications, progress reports including a discharge note, and a treatment note for every single treatment day.

The failure points hide in the timing rules, which live in the Medicare Benefit Policy Manual, chapter 15. The initial certification is timely when it is dated within 30 calendar days of the first treatment under the plan. Recertification is due within 90 days. There is even a mercy rule: a late certification is acceptable without justification for 30 days after it was due, and later than that only with a documented reason for the delay. Progress reports are due at least once every 10 treatment days, counted from the first visit of the episode, whether that visit was an evaluation or a treatment.

None of this is exotic. CMS’s own TPE material offers “a missing physician’s signature” as its example of a common error, and calls errors like it simple and easily corrected. That is the texture of the 88.6%: plans of care sitting unsigned in a referring physician’s inbox while the claims for those visits go out the door.

The daily note is where audits are won

Chapter 15 requires four things in every treatment note: the date, each intervention provided “in language that can be compared with the billing on the claim,” the total timed code minutes plus the total treatment time in minutes, and the signature and professional identification of whoever furnished or supervised the care.

The minutes requirement carries a sentence worth memorizing: “The billing and the total timed code treatment minutes must be consistent.” That is the 8-minute rule as auditors actually apply it. The unit math comes from the Medicare Claims Processing Manual, chapter 5: one unit covers 8 through 22 timed minutes, three units cover 38 through 52, and nothing under 8 minutes is billable on its own. Bill four units over a note that totals 52 timed minutes and the claim is citable on arithmetic alone. No reviewer has to argue medical necessity to recoup it; 52 minutes supports three units, and the fourth was never documented.

This is the check worth running on your own charts before a contractor does. Pull ten recent Medicare visits and add up the timed minutes in each note. If the totals are missing, or the units billed do not fit the ranges, that pattern is sitting in your claims data right now. Claims data is exactly what MACs mine to choose TPE targets.

How does a TPE audit work?

The MAC requests 20 to 40 claims with their supporting records. It reviews them, sends a results letter, and offers a one-on-one education session built from your specific errors. You then get at least 45 days to improve before the next round, and there are up to three rounds. Pass, and CMS says you will not be reviewed again on that topic for at least a year. Fail all three, and the file goes to CMS for next steps that include 100% prepay review, extrapolation of the error rate across your billing, or referral to a Recovery Auditor.

Extrapolation is the word that should hold your attention. A bad error rate on a 40-claim sample can be applied as a percentage across everything you billed, which turns a modest repayment into a multiple of it. The denied visit was never the expensive part.

Make the chart do the remembering

Everything reviewers cite is checkable inside your own system a week before it is citable in an audit. A running total against the $2,480 threshold, so the KX modifier lands on the crossing claim. Certification dates lined up against first-visit dates on every active plan of care. A treatment-day counter that flags the eighth visit since the last progress report. Two totals fields in the daily note that refuse to stay empty.

This is work software should carry, because humans drift and the data does not. In Orion, timed codes missing their minutes are flagged in the visit before you can sign, and the claim scrub checks units against documented treatment time on the way out. Care plans keep evaluation, goals, progress and discharge in one structure on every case. Aurora, the ambient AI scribe included on both plans, drafts the note while you treat, so the fields a reviewer reads are filled before the patient reaches the parking lot. Focus on your patient, not your keyboard.

A reviewer never meets your patient. As far as Medicare is concerned, the chart is the visit. Write it so a stranger with a checklist agrees it happened.