When the referral leaves your desk, the billing risk doesn't

The referral, in most primary care workflows, is an end point. A patient with claudication, diminished pulses or a nonhealing wound gets an ankle-brachial index (ABI), a diagnosis, and a referral to a vascular surgeon or interventional radiologist to treat peripheral artery disease (PAD). The specialist takes it from there, but from a coding and billing standpoint, that handoff is incomplete, especially as federal auditors focus more on peripheral vascular procedures.

When auditors review a vascular intervention, they ask:

• Was conservative management attempted?
• Was the clinical indication documented?
• Did the record support the level billed?

A recovery audit contractor reviewing a claim for lower extremity angioplasty answers those questions from the treating physician's own records, not the referral. It doesn't typically pull a referring physician's notes to confirm conservative treatment happened; it looks at whether the specialist's documentation establishes that history, whether it came from the patient's account or from records the specialist requested and folded in. A referral note that just says "patient referred for evaluation of PAD" doesn't create a problem by itself, but it leaves the specialist more to reconstruct at the time of the visit, not after an audit letter arrives.

The referral becomes part of the medical necessity story

Primary care physicians aren't usually trained to think of a referral as a compliance artifact. But for vascular interventional procedures, especially those done in office-based laboratories (OBLs) now under increased federal scrutiny, a referral's documentation becomes raw material for a medical necessity case.

Medicare's coverage criteria for peripheral vascular procedures require documented conservative management first: supervised exercise, medication optimization and lifestyle changes. That history has to end up in the specialist's own chart, built from whatever's available: the patient's account, records requested from the referring physician or both. A thin primary care record (one visit, one ABI result, a referral) doesn't sink the specialist alone, but it means more work establishing that conservative care happened before the intervention.

What primary care physicians should know right now

In May 2026, the U.S. Department of Health and Human Services Office of Inspector General (HHS-OIG) published a report on Medicare Part B payments for peripheral vascular procedures in OBLs, identifying about $105 million in potentially unnecessary procedures concentrated among physicians performing unusually high volumes of angioplasty, stenting and atherectomy. The Centers for Medicare & Medicaid Services (CMS) agreed to follow up, and a vascular practice later agreed to pay more than $6.73 million to settle False Claims Act allegations over unnecessary vascular procedures.

For primary care physicians, the key takeaway is referral pattern awareness. Physicians at the center of the HHS-OIG's findings stood out on intake volume: about four times the average Medicare patient volume and roughly double the average procedures per patient. Referral relationships are among the data points regulators may evaluate when examining utilization patterns.

As Medical Economics has reported, audit risks from cardiology and vascular codes carry unique exposure because CMS contractors apply coverage criteria inconsistently. That inconsistency makes documentation precision at every stage of care, including the referral, more important than in most other specialties.

What does each physician actually own?

The billing responsibilities of referring and treating physicians are legally distinct but practically interrelated. The referring physician's role is to document the clinical findings that support the referral decision and communicate relevant treatment history: appropriate International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) codes describing the underlying condition rather than a symptom alone (such as codes from the I70.21x family for atherosclerosis with intermittent claudication) plus any conservative management attempted. The treating specialist's job is an independent medical necessity determination at the time of the procedure, documentation of the procedure and coding accuracy. They can't outsource that to the referring chart, but a well-documented referral may provide useful clinical context, while a limited referral may require the specialist to gather additional supporting information.

Shared exposure shows up mainly in two places: a referral pattern financially structured to implicate the Stark Law or Anti-Kickback Statute and a thin primary care record that leaves the specialist without enough material for a defensible case of their own. Coinvestment structures in OBLs, where referring physicians hold ownership stakes in facilities they refer Medicare patients to, are under particular scrutiny.

What does good documentation look like before a vascular referral?

For primary care physicians who regularly manage patients with PAD or chronic venous insufficiency, a few documentation habits reduce downstream risk.

The diagnosis should be coded to the highest available specificity. A referral coded to localized edema for a patient with documented chronic venous insufficiency misrepresents the clinical picture and may not support the specialist's procedure codes.

Conservative management should be documented explicitly, with dates. "Conservative treatment failed" isn't documentation. A dated sequence with how long the patient did supervised exercise therapy, what medication changes were tried, and how they responded is. That detail gives the specialist something concrete to carry into their own note, which is what a recovery audit contractor actually reviews.

The clinical indication should appear in the referral, not just the disposition. "Referred to vascular surgery" is a disposition. "Referred to vascular surgery for evaluation of critical limb ischemia after six weeks of supervised exercise therapy and maximal medical management failed" is documentation that supports a billing decision.

Primary care physicians are also often the first to spot nonhealing ulcers, rest pain or tissue loss, with appropriate ICD-10-CM codes (such as the I70.23x and I70.24x families for atherosclerosis with ulceration) that belong in the record before the referral leaves the office.

The coordination imperative

The practical challenge: The coding and billing norms of procedural specialties aren't part of primary care training. A family medicine practice isn't expected to know Current Procedural Terminology codes for selective catheter placement or local coverage determination criteria for lower extremity revascularization, but documentation decisions made there shape what's possible downstream.

The most practical step for primary care practices that regularly refer to vascular and interventional settings is a direct conversation with those specialists about what documentation actually helps. That conversation isn't a compliance burden. As Medical Economics has noted, building a culture of compliance, including cross-specialty communication and documented referral policies, is a real mitigating factor if a government auditor shows up.

The referral is where the patient's path into specialty care begins. In an enforcement environment scrutinizing peripheral vascular procedures from multiple directions at once, it's also where the documentation record that matters most starts to take shape or doesn't. Primary care physicians don't carry the billing risk that vascular specialists carry, but the records they create are part of what those specialists work with when that risk gets tested.

That's worth knowing before the next referral leaves the desk.

Elina Sabilova, CPC, CFPC, CPMA, is a billing and compliance specialist in the Billing Department at WCH Service Bureau, a nationwide medical billing, credentialing and compliance firm. As supervisor of revenue cycle management at WCH Service Bureau, she oversees complex billing operations for high-volume specialty practices, ensuring accurate reimbursement while maintaining strict compliance with federal, state, payer, American Medical Association and Society of Interventional Radiology guidelines.