Sixty-One Percent: What OIG Found in Outpatient PT Claims

by | Feb 13, 2026 | Compliance & Risk

pt documentation compliance

The documentation failures that cost outpatient physical therapy practices money are not exotic. CMS publishes the list. Most practices have never read it.

Key Takeaways

  1. OIG reviewed 300 outpatient physical therapy claims and found 61 percent did not comply with medical necessity, coding, or documentation requirements, estimating $367 million in improper payments over a six-month period.
  2. For CY 2026 the KX modifier threshold is $2,480 for PT and SLP combined. The targeted medical review threshold stays at $3,000 through 2028.
  3. Since January 1, 2025, a signed and dated physician or NPP order or referral may substitute for the signature on an initial therapist-established plan of care under defined conditions.
  4. The most common CERT errors are mundane: missing certifications, missing signatures, incomplete plans of care, missing total timed minutes, and missing progress reports.

In March 2018 the HHS Office of Inspector General published the result of a stratified random sample of 300 Medicare claims for outpatient physical therapy services. Sixty-one percent of them – 184 claims – did not comply with Medicare medical necessity, coding, or documentation requirements. Extrapolated across the six-month audit period, OIG estimated Medicare paid $367 million for outpatient physical therapy services that did not meet requirements. CMS generally disagreed with the findings and with the first recommendation, arguing that some of the policy interpretations warranted further analysis. OIG maintained its determinations. That disagreement is worth knowing, but it is not a reason to relax: OIG’s recommendation to improve provider education explicitly cited the 61-percent error rate, and CMS implemented it.

For context on the broader environment, CMS reported a Medicare fee-for-service improper payment rate of 6.55 percent for fiscal year 2025, or $28.83 billion, down from 7.66 percent the prior year. Most improper payments across CMS programs are not fraud. They are situations where a reviewer could not determine whether payment was proper because the documentation was insufficient. That is precisely the failure mode outpatient physical therapy is built for, because the service is delivered in minutes and justified in narrative.

The useful part is that CMS publishes the specific errors it finds. Its outpatient rehabilitation therapy documentation fact sheet, updated in September 2025, lists them directly. None are exotic. Most are clerical. All of them are preventable by a process rather than by clinical skill.

The Errors CMS Actually Finds

The published CERT error list for outpatient rehabilitation therapy reads like an operations checklist, which is how you should treat it:

  • Missing certifications and recertifications. The physician’s or NPP’s dated signature approving the plan of care, absent from the record.
  • Missing signature on the plan itself. The therapist who developed the plan did not sign, date, or add professional identification.
  • Missing or incomplete plan of care. CMS specifies the minimum: diagnoses, long-term treatment goals, service type, and the amount, frequency, and duration of therapy.
  • Missing significant plan-of-care changes. A materially modified plan was never recertified.
  • Missing total time. Total minutes of timed-code treatment, and total treatment time including untimed services, not documented for the date of service.
  • Missing or incomplete initial evaluation, and missing or incomplete progress reports. Progress reports are required at least once every 10 treatment days and must carry signature, professional identification, and date.

Note the sixth item carefully, because it connects directly to the economics of the practice. The units you bill are defended by documented minutes. If the record does not show total timed minutes and total treatment time separately for that date, the units are not supportable regardless of what actually happened in the gym.

Certification: The Clock Most Practices Do Not Run

The physician or NPP certifies the initial plan of care with a dated signature or verbal order within 30 calendar days from the first day of treatment, including evaluation. Verbal orders must be signed and dated within 14 calendar days. A correctly written and signed plan satisfies certification for the duration of the plan or 90 calendar days from initial treatment, whichever is less. Recertification is required whenever a significant modification becomes evident, or at least every 90 calendar days.

There is meaningful relief here that took effect January 1, 2025, following coordinated advocacy by APTA and AOTA. For therapist-established plans of care, the physician’s or NPP’s dated signature on the written order or referral may substitute for a signature on the initial plan of care if that physician or NPP has not signed and returned the plan within 30 calendar days of the initial evaluation. The conditions are specific: the order or referral must be signed and dated, must identify the physician or NPP and the patient, and must indicate the type of therapy needed. The record must contain both that order and evidence the plan of care was delivered to the physician or NPP within 30 calendar days of the initial evaluation. The exception does not apply to recertifications, and it does not apply in a comprehensive outpatient rehabilitation facility.

That is a genuine reduction in administrative burden for practices that chase unsigned plans. It is also useless if nobody in your office is tracking the 30-day delivery evidence, which is the piece most practices do not currently capture.

Documented minutes are what defend billed units. Everything that happened in the gym but not in the note is charity.

Thresholds, the KX Modifier, and Targeted Review

For CY 2026 the KX modifier threshold is $2,480 for physical therapy and speech-language pathology services combined, with a separate $2,480 for occupational therapy. That is up from $2,410 in 2025 and $2,330 in 2024; the amount is indexed annually by the Medicare Economic Index. These are not caps. When a patient’s cumulative charges exceed the threshold, subsequent claims carry the KX modifier as your attestation that the services are medically necessary and that the record justifies them.

The KX modifier is an attestation, not a submission. You do not send documentation with it. You are responsible for consulting the Medicare manuals and professional literature to determine whether the beneficiary qualifies for the exception, and your attestation does not bind the contractor, which makes the final determination on payability. The judgment CMS asks you to make is whether the services are appropriate to the patient’s condition, diagnosis, complexity, and severity; to the type, frequency, and duration of services provided; and to the interaction of active conditions that cause treatment to exceed the threshold.

Above that sits the targeted medical review threshold of $3,000, which stays fixed through 2028 and is indexed thereafter. Targeted means what it says: not all claims above $3,000 are reviewed. CMS uses a supplemental medical review contractor, and the selection factors are published. Claims are more likely to be pulled where a provider has a high denial percentage for therapy services, a billing pattern aberrant compared with peers, billing of medically unlikely units within a single day, newly enrolled status, treatment of targeted medical conditions, or membership in a group containing a provider already flagged. Read that list as a description of what your own internal monitoring should track, because those are the metrics somebody else is already tracking about you.

From the Field

A two-clinic physical therapy practice in the Mid-Atlantic received an additional documentation request covering fourteen claims and discovered it could not locate signed certifications for six of them. Nothing clinical was wrong; the practice simply had no tracking mechanism, and unsigned plans had been faxed to referring offices and forgotten. A chart audit against the published CERT error list found the same defect in roughly a quarter of the active caseload, plus a widespread failure to document total timed minutes separately from total treatment time. Rather than deliver an audit report, our fractional engagement built a certification tracker into the practice’s existing documentation workflow with a 30-day escalation trigger, implemented the order-and-referral substitution pathway including the delivery evidence CMS requires, ran three chart-review sessions with the clinical team on minute documentation, and worked the response to the open ADR alongside the billing coordinator. The recurring certification defect went to near zero within two months and stayed there through the following year’s internal audit.

Build the Monitoring You Would Want in an Audit

Four internal controls cover most of the exposure. Run a monthly certification aging report so no plan reaches day 25 unsigned. Sample ten charts a month against the published CERT error list – not a custom checklist, the actual list. Track your own KX utilization rate by therapist and your denial rate for therapy services, because those are selection factors. And know that if a MAC identifies a potential Part B overpayment within the six-year lookback period, you are obligated to report and return identified overpayments. Rules in this area change, and high-stakes decisions – an extrapolated overpayment demand, a self-disclosure question – should be reviewed by healthcare counsel.

Advice Versus Execution

A consultant can audit your charts, benchmark your KX utilization, and hand you a corrective action plan that is accurate and complete. If you have a compliance lead or an office manager with real time to implement it, that is frequently the better value and the more economical choice, and we will say so.

Compliance plans do not fail at the finding stage. They fail because implementing one means sitting with the front desk to build a certification tracker into a workflow that already feels full, running chart reviews with clinicians who are treating full caseloads, and holding the sampling cadence in month seven when nothing has gone wrong and everyone has stopped worrying. A fractional executive does the same analysis and then does that work inside your practice with your staff. Be a careful buyer, though – “fractional executive” is an unregulated label and some firms sell ordinary consulting under it. Ask directly whether the person will be working in your documentation system with your team or delivering a plan for you to deploy. Both are real services. Only one of them changes your charts.

Sources

  1. HHS Office of Inspector General, A-05-14-00041, Many Medicare Claims for Outpatient Physical Therapy Services Did Not Comply With Medicare Requirements — https://oig.hhs.gov/reports/all/2018/many-medicare-claims-for-outpatient-physical-therapy-services-did-not-comply-with-medicare-requirements
  2. CMS, MLN905365, Complying With Outpatient Rehabilitation Therapy Documentation Requirements (September 2025) — https://www.cms.gov/files/document/mln905365-complying-outpatient-rehabilitation-therapy-documentation-requirements.pdf
  3. APTA, Medicare Payment Thresholds for Outpatient Therapy Services — https://www.apta.org/your-practice/payment/medicare-payment/coding-billing/therapy-cap
  4. CMS, Fiscal Year 2025 Improper Payments Fact Sheet — https://www.cms.gov/newsroom/fact-sheets/fiscal-year-2025-improper-payments-fact-sheet
  5. APTA, CMS Updates Guidance to Reflect Current Plan of Care Signature Exception (December 2025) — https://www.apta.org/article/2025/12/03/cms-updates-guidance-to-reflect-current-plan-of-care-signature-exception
  6. CMS, Medicare Benefit Policy Manual (Pub. 100-02), Chapter 15 — https://www.cms.gov/Regulations-and-Guidance/Guidance/Manuals/downloads/bp102c15.pdf

More in the Physical Therapy Series

See the full Physical Therapy practice management page →