KX modifier and Medicare therapy thresholds for occupational therapy, 2026.

Two dollar figures decide whether an OT claim goes out clean, needs a modifier, or lands in a review queue: $2,480, the KX modifier threshold, and $3,000, the targeted medical review threshold above it. Neither number changes how you treat a patient, but both change how the claim has to be built, and missing either one is entirely preventable if the running total is tracked instead of estimated. This is our KX modifier and therapy threshold guide for occupational therapy — what counts toward each threshold, how the KX attestation actually works, what happens once a claim crosses into targeted review, and the compliance exposure of appending KX without the record to back it up.

The two thresholds, side by side

Congress repealed the hard Medicare therapy cap in 2018, but replaced it with a structure that functions similarly in practice: a dollar figure that, once crossed, requires an attestation to keep billing, and a second, higher figure that exposes claims to review. Both numbers are recalculated annually and both apply per calendar year, resetting to zero every January 1 regardless of where a patient's plan of care stands.

⚠️ This page states the CY2026 figures as reported by CMS Transmittal R13437CP via secondary industry reporting (a state PT/OT association bulletin summarizing the transmittal); CMS's own therapy-services and transmittal pages returned access errors to automated retrieval while researching this build. Confirm the current-year figure directly against the transmittal or your MAC's published therapy threshold notice before relying on it operationally — these amounts are indexed and republished annually, typically in the November before the effective calendar year.

What actually counts toward the $2,480 KX threshold

The number that accumulates toward the threshold is the Medicare Physician Fee Schedule allowed amount for the beneficiary's outpatient OT services — not the amount your practice charged, and not the amount Medicare actually paid after sequestration or any other post-allowed adjustment. Allowed amount sits between those two figures, and using the wrong one to track your own running total will throw the number off in either direction.

• 1Tracked per calendar year, per beneficiary, resetting every January 1. A patient mid-plan-of-care on December 31 starts the new year back at zero, regardless of how close to or past the prior year's threshold they were.
• 2Tracked separately from PT/SLP. The PT/SLP combined threshold happens to also be $2,480 for 2026, but the two totals do not share a pool — a patient can be well under the PT/SLP figure while already past the OT one, especially in a multi-discipline plan of care.
• 3Not visible to your practice in real time by default. CMS doesn't push a running total to the provider; it has to be tracked in your own billing system against allowed amounts as claims process, which means a system built on billed charges instead of allowed amounts will drift from the real figure over time.

Because the allowed amount for any given code is locality-specific and not fixed, the exact visit count at which a given patient crosses $2,480 varies by geography and by which codes were billed — there's no universal "visit 14" rule. Track the dollar total directly rather than trying to translate it into a visit-count heuristic; a heuristic built for one locality's fee schedule will be wrong in another.

How the KX modifier attestation actually works

Appending KX to a claim line is a self-attestation, not a documentation submission. Nothing extra accompanies the claim — no additional form, no attached note, no separate authorization request. What KX attests, specifically, is that the services billed on that line are medically necessary and that documentation justifying that necessity exists in the patient's medical record, on file and ready to produce if a MAC, a program integrity contractor, or an auditor asks for it.

That "ready if asked" structure is exactly where practices get into trouble. Because nothing is checked at the point of billing, a claim with KX appended but a chart that doesn't actually support continued medical necessity will still pay — right up until the record is requested. The absence of a submission gate makes it feel like a formality; it isn't. The three documentation elements that hold up under a KX-related record request are the same ones that hold up under any OT medical necessity review: measurable functional goals stated in terms a reviewer can verify against progress notes, a documented baseline to measure change against, and an explicit statement of why continued treatment requires a skilled therapist rather than a home program or unskilled assistance. A plan of care that just says "continue POC" past the threshold, without restating why skilled OT is still required, is the pattern most likely to fail a post-hoc review even though the claim itself processed cleanly.

What happens at the $3,000 targeted review trigger

The targeted medical review process, established under Section 202 of MACRA and retained by the Bipartisan Budget Act of 2018 at the current $3,000 level, is frequently misdescribed as an automatic review of every claim past that dollar amount. It isn't. Crossing $3,000 makes a beneficiary's claims eligible for selection under a risk-based review process — the MAC or another CMS program integrity contractor selects specific claims based on factors like a provider's billing pattern, history of denials, aberrant utilization, or other program integrity criteria, not a blanket rule that pulls every claim above the threshold.

Being selected means receiving an additional documentation request (ADR) with a response deadline, typically 30 to 45 days depending on the contractor. The record submitted in response has to independently support medical necessity for the specific dates of service under review — the KX attestation on the claim doesn't substitute for producing the actual documentation once it's requested. Missing the ADR deadline results in an automatic denial regardless of whether the underlying care was medically necessary, which makes ADR tracking a workflow issue as much as a documentation one: a practice with strong charting but a slow mailroom process can still lose a claim it should have won on the merits.

The compliance risk of appending KX without a documented basis

Because KX is a self-attestation rather than a submission requirement, the temptation in a high-volume billing operation is to treat it as a switch that flips automatically once the running total crosses $2,480 — append it, move on, never look at the chart again. That's the exposure. KX attests to medical necessity specifically, not merely to "the patient is still over the threshold and still coming to visits." A record that doesn't support continued medical necessity, with KX attached anyway, is a false attestation on the claim, and that exposure sits with the practice regardless of whether any individual claim is ever selected for review. A pattern of KX-attached claims with thin or templated documentation is also exactly the kind of aberrant billing signal that increases the odds of being selected under the $3,000 targeted review process described above — the two thresholds aren't independent risks in practice, even though they're separate rules on paper.

Frequently asked questions

Related resources

• Occupational therapy billing and coding guide
• ICD-10 specificity for occupational therapy claims
• Prior authorization and Medicare Advantage denials in occupational therapy
• Denial management