A federal report released in May 2026 found that physicians performing peripheral vascular procedures in office-based labs collected $105 million in payments that may reflect more atherectomies and tibial artery procedures than patients needed. The U.S. Department of Health and Human Services Office of Inspector General traced that pattern to a narrow group: 26 physicians accounted for nearly two-thirds of it. UPIC (Unified Program Integrity Contractor) investigators work from similar billing-pattern data, so a lab that repeats atherectomy on the same leg now sits inside a documented audit target. The exposure runs from a sample-claim recoupment demand to a referral for further investigation.
Why Office-Based Labs Draw UPIC Scrutiny
Medicare pays physicians more for a peripheral vascular procedure performed in an office-based lab than for the identical procedure in a hospital outpatient department or an ambulatory surgical center. An office-based lab bundles its facility costs into the physician's Part B payment; a hospital or surgical center bills its facility costs separately. That structure helped drive a shift in where these procedures happen: the office-based share rose from 37.8 to 46.5 percent between 2019 and 2023. By 2023, three-quarters of the peripheral vascular procedures billed from office-based labs included an atherectomy, and nearly half involved a tibial artery. Medicare has a national coverage policy for angioplasty and for stenting of the iliac, femoral, and popliteal arteries, but none for atherectomy or tibial artery procedures. Without that national standard, medical necessity for the two procedures auditors scrutinize most turns on the individual chart, not a settled federal rule.
The Billing Patterns Auditors Flag
OIG's review identified four billing patterns that, on their own, justify a closer look, short of alleging fraud. Eighty-two physicians billed a tibial artery procedure for at least 95 percent of their Medicare patients, against a 57 percent average for everyone else, accounting for $61.2 million in flagged payments. Forty-three physicians averaged 5.7 procedures per patient against a 2.3-procedure average, accounting for $42.2 million. Twenty-six physicians performed an atherectomy in both the femoral and tibial arteries during 84 percent of their surgical sessions, against a 27 percent average. That pattern, repeated intervention on more than one vessel in the same limb in a single visit, is the one OIG's report says whistleblower fraud cases have alleged as unnecessary atherectomy billing. A fourth group of 38 physicians treated at least 94 percent of their patients for early-stage disease that the professional guidelines OIG's report cites say should be managed first with medication and lifestyle changes, not a procedure.
Twenty-six physicians, about one percent of those billing for office-based vascular procedures, accounted for nearly two-thirds of the payments OIG flagged as possibly medically unnecessary.
The Documentation That Holds Up
An auditor reviewing a vascular claim reads the angiogram or duplex study next to the operative note, not the CPT code. The record has to show the specific vessel and lesion treated, the degree of disease the imaging documented, and, for a repeat procedure, why the vessel needed treatment again. A chart that skips the medication and lifestyle step that guidance calls for on early-stage disease is the same chart OIG's early-stage measure would flag. A complete signature log matters too. An auditor who cannot match an illegible or stamped signature to the ordering physician can deny the claim on that basis alone, regardless of the clinical record underneath it.
What a UPIC Investigation Looks Like
CMS directs its Medicare Administrative Contractors to open a provider-specific review on referral from a UPIC, OIG, or a Recovery Audit Contractor when billing varies from peers, the same comparison OIG ran. Since 2019, CMS and its contractors have run 46 Targeted Probe and Educate reviews and opened a claims analysis project aimed at physicians who bill atherectomy more often than their peers. Qlarant and SafeGuard Services, two of the UPICs active in this space, typically open with an additional documentation request for a sample of claims. The sample's findings can be extrapolated across the full population of claims under review, turning a request for a handful of charts into a demand covering years of billing.
Why Early Legal Counsel Is Critical
It is critical that physicians and office-based labs promptly retain experienced healthcare defense counsel upon receiving a UPIC additional documentation request, audit notice, or any related government inquiry. Early legal intervention can protect the provider's rights, ensure the response to the contractor is accurate and complete, avoid inadvertent admissions, preserve relevant defenses, and allow counsel to communicate with the UPIC on the provider's behalf. Delaying legal representation can significantly affect the outcome of a matter and expose the provider to unnecessary risk, including an extrapolated recoupment that proper handling could have limited.
How Health Law Alliance Can Help
Health Law Alliance represents physicians and office-based labs through every stage of a UPIC review, from the first documentation request through extrapolation disputes and appeal.
Health Law Alliance's attorneys have overseen 2,000+ audits and handled 5,000+ matters, with 25+ years of experience.
If an office-based lab has received a UPIC additional documentation request concerning atherectomy or tibial artery billing, Health Law Alliance's UPIC audit defense attorneys are available for a free, confidential consultation before the response deadline runs.
