Five Places Vascular Claims Are Breaking in 2026 (and How to Check Yours)

Six months into the 2026 Lower Extremity Revascularization framework, the failure points are no longer a mystery. They aren't random; the structure of the new rules predicts exactly where claims break, and the same five pressure points fall out of that structure every time. Which is good news, in a way, because a predictable failure is a checkable one.

Here are the five, what breaks at each, and how to audit your own claims before a payer does it for you.

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1. Lesion classification that the note can't support

The framework's central fork, straightforward versus complex, is defined concretely: straightforward means stenosis (a partial narrowing), complex means occlusion (100%). Every territory's code family splits on this line, and the complex codes reflect the harder work.

The failure: operative notes that say "severe stenosis," "critical lesion," or "near-occlusion." Clinically vivid, administratively worthless. A near-occlusion is a stenosis, and an auditor reading "severe disease" six months from now will support only the straightforward code. Practices are losing the complexity differential not because the work wasn't done, but because the note never said the one word the code requires: occlusion.

Check: sample ten complex-lesion claims and confirm the note explicitly documents total occlusion. Every miss is either downcoded revenue or upcoding risk.

2. Vessels that aren't vessels

The framework collapses anatomy in ways intuition resists. The common femoral and profunda count as one vessel; the superficial femoral and popliteal count as one. The tibioperoneal trunk belongs to the posterior tibial or peroneal, not separately coded unless it's treated with the anterior tibial or is the only vessel treated. The pedal arch belongs to the dorsalis pedis and plantar arteries unless it's the sole target. And when a lesion crosses from one vessel into another, only one vessel is reported.

The failure: additional-artery add-on codes stacked on treatments the framework considers a single vessel. Each one is a small overbilling with a long audit tail.

Check: review your add-on code usage by physician. If someone's fem-pop cases routinely bill multiple additional arteries, look at the anatomy underneath.

3. Diagnostic angiography billed on autopilot

Diagnostic angiography at the time of intervention is separately reportable only under specific conditions: no prior catheter-based study exists and the decision to intervene rests on this one, or a prior study exists but the record documents a changed condition, inadequate visualization, or a clinical change during the procedure requiring evaluation outside the target area.

The failure runs both directions. Some practices bill the angiogram on every case out of habit, a pattern automated review flags quickly. Others, spooked by the rules, stopped billing it even when the justification is legitimate and documented. Both patterns cost money; only one also invites an audit.

Check: pull your intervention claims and calculate the percentage billed with diagnostic angiography. A rate near 100% or near 0% both deserve a closer look at the underlying notes.

4. Lithotripsy and atherectomy in the wrong territory

Lithotripsy is an add-on in the iliac territory (37262) and the femoral-popliteal territory (37279), added to angioplasty codes only in the iliac case. In the tibial-peroneal territory it's bundled and not separately billable, and it has no separate role inframalleolar, where only angioplasty is reported at all. Meanwhile, iliac atherectomy still routes to Category III code 0238T rather than the new family.

The failure: charge tickets and coding habits that treat lithotripsy and atherectomy as uniformly billable devices rather than territory-dependent ones.

Check: search your 2026 claims for lithotripsy codes on tibial-peroneal cases and atherectomy codes on inframalleolar cases. Any hits are denials pending, or refunds pending.

5. Failed crossings billed as interventions

Per the 2026 guidelines, a procedure that doesn't achieve successful crossing and successful intervention is a diagnostic procedure, reported with catheterization and diagnostic angiography codes. Billing the intervention anyway contradicts the operative note in the payer's own file; billing a bare catheter placement forfeits the diagnostic work that's legitimately payable.

Check: find your aborted cases since January and confirm each was rebuilt as a diagnostic claim, not billed as an intervention, not written off.

The pattern behind the pattern

Run all five checks and you'll notice they test the same thing: whether anyone in your billing chain is applying the framework case by case, rather than code by code. Loading 46 new codes into a system took every biller in the country one afternoon. Reading every operative note against these five failure points takes expertise, time, and a reason to care. That last item is where many billing relationships quietly fall short. A biller paid to process claims has processed them. Whether they'd survive an audit is, conveniently, someone else's future problem.

We'd rather it be nobody's problem. MD Billing's free revenue cycle assessment runs these five checks (and a few others) against a sample of your actual 2026 claims, and shows you the findings whether or not you ever work with us. Take it at mdbilling.com, or contact us to talk through what you're seeing on your remits. The failure points are predictable now. Unchecked, so are the consequences.