Dialysis Vascular Access Billing in 2026

The AV Fistula, Graft and Circuit CPT Codes That Pay, and the Bundling Rules That Zero Them Out

By Team Rcmaxis  ·  October 26, 2026  ·  10 min read

A single percutaneous AV fistula creation code, CPT 36836, pays $8,032.92 in the non-facility setting under Medicare's 2026 national fee schedule. Bill the vascular access, the imaging guidance and the maturation technique as separate lines on that same claim, and the payer doesn't just deny the extras. The bundling edit built into the code definition zeroes them out and leaves you arguing over a single line that should have paid correctly the first time. Dialysis vascular access is one of the highest-dollar code families in nephrology and vascular surgery billing, and it's also one of the easiest to under-bill, over-bill, or get bundled into the ground by a coder who doesn't know where the edges of each code actually sit.

The codes themselves aren't new. CPT added nine endovascular dialysis circuit codes, 36901 through 36909, back in 2017, and the AV fistula creation codes have been on the books even longer. What trips practices up in 2026 is the bundling logic underneath the code set: one code per circuit intervention per session, maturation procedures folded into the creation code whether you itemize them or not, and a non-facility-to-facility payment gap wide enough to swing a single claim by thousands of dollars depending on where the service is billed from.

Here's what CMS actually pays for each code in this family in 2026, where the one-code-per-session rule quietly costs practices real revenue, what federal enforcement history says about where auditors look, and how to build a billing workflow that doesn't leave money sitting in a bundling edit.

The Dialysis Circuit Intervention Codes: CPT 36901-36909

These codes cover endovascular work on an existing fistula or graft circuit: fistulograms, angioplasty, thrombectomy and stent placement. CMS's bundling rule for this family is strict and unforgiving: only one code from 36901 through 36906 is billable per session, regardless of how many separate technical steps the intervention actually involved. Treat a thrombosed fistula with a mechanical thrombectomy, an angioplasty and a stent in a single sitting, and the correct code is 36906, the single highest-value code the documented work supports, not three line items stacked on top of each other.

Figures are the 2026 Medicare national unadjusted rate, calculated from the CMS 2026 Physician Fee Schedule relative value file (total RVU × the $33.4009 conversion factor), before geographic adjustment. The add-on codes 36907-36909 cover work in the central dialysis segment, a different anatomic territory from the peripheral-segment codes above them, and they're reported in addition to the base code, not instead of it, when central-segment work is separately performed and documented.

AV Fistula and Graft Creation: Where the Bundling Trap Costs the Most

Open surgical fistula and graft creation, CPT codes 36818 through 36833, pay a flat rate regardless of site of service, since these procedures are almost always performed in a facility setting. The 2026 national rate runs from roughly $566 for an open thrombectomy of an AV fistula (36831) up to $736 for a fistula revision with thrombectomy (36833).

The percutaneous creation codes, 36836 and 36837, pay very differently. In the non-facility setting, where the physician's own office or lab absorbs the device and supply cost, CMS's 2026 rate is $8,032.92 for 36836 (single access) and $9,092.73 for 36837 (separate access points). Bill the identical procedure in a hospital outpatient or ASC facility setting, where the facility separately bills the device cost under OPPS, and the physician-only payment drops to $313.63 and $400.81. That's not an error; it's the fee schedule correctly splitting device cost from professional work by setting. The error happens when a practice bills the non-facility rate for a procedure actually performed in a facility, or vice versa.

The bigger trap sits inside the code definition itself. CPT 36836 already includes the vascular access, the angiography and imaging guidance, and any fistula maturation or blood-flow redirection technique performed at the same session. These aren't separately billable add-ons dressed up as upgrades; they're already paid for inside the single code. A claim that lists 36836 plus a separate imaging-guidance line, or a separate maturation-technique line, isn't capturing extra revenue. It's triggering a correct-coding edit that strips the extra lines and, often, flags the claim for a closer look at everything else on it.

One Code Per Session: the Rule That Quietly Costs the Most

Run the numbers on a real thrombosed-fistula case: mechanical thrombectomy, a peripheral angioplasty and a stent, all in one session. Billed correctly as a single 36906, the facility-setting payment is $445.23. Billed incorrectly as three stacked lines (36904 + 36902 + 36903), the claim would appear to total over $800 in facility-rate payments if it somehow slipped through unbundled, which is exactly why it won't. NCCI edits and the code's own definition catch this pattern automatically, and the claim gets reprocessed down to the single highest code, 36906, after a delay, a resubmission cycle, and in some cases a records request from the payer.

The financial risk runs in both directions. Under-coding, billing 36902 for a session where a stent was also placed, leaves roughly $3,600 in facility-rate revenue on the table for 36903 alone, or over $5,400 if 36906 was the code the work actually supported. Over a busy interventional nephrology or vascular practice doing a dozen circuit interventions a week, the gap between consistently coding to the single correct highest-value code and defaulting to the lowest safe-looking code adds up to tens of thousands of dollars a year, in either direction.

OIG and DOJ Enforcement: What Auditors Are Actually Targeting

Dialysis vascular access billing has a real federal enforcement history, and it's worth knowing what it actually looked like. In October 2018, Vascular Access Centers L.P. and 23 related entities agreed to pay at least $3.825 million, with total exposure up to $18.3 million, to resolve allegations that the company billed Medicare for non-reimbursable vascular access procedures performed on ESRD beneficiaries, alongside an alleged kickback scheme tied to how those procedures were referred. The case wasn't about a coding technicality; it was about procedures billed that shouldn't have been billed at all, combined with a referral arrangement that gave the company a financial incentive to perform more of them.

That combination, volume driven by referral incentives rather than documented clinical need, is exactly the pattern CMS's own coverage rules for this code family are built to screen out. Medicare's Local Coverage Determination for dialysis access maintenance requires clear documentation of the site and extent of any hemodynamically significant stenosis, generally defined as at least 50% of the vessel diameter, before angioplasty is considered medically necessary. Angioplasty performed on a vessel that isn't documented as significantly stenosed by angiography or ultrasound is explicitly called out as not medically necessary, and percutaneous treatment of a total graft occlusion more than a year old is treated the same way.

Medical Necessity Documentation and Prior Authorization

Traditional Medicare doesn't require prior authorization for medically necessary dialysis access procedures, but the documentation bar functions like one. Under the governing LCD, the clinical findings that justify an intervention are specific and have to show up in the note, not just the stenosis percentage. Venous outflow problems include elevated venous pressure in the access, prolonged bleeding after needle removal, recirculation above 10-15%, pseudoaneurysm development, limb or neck swelling, and loss of the normal machine-like bruit on exam. Arterial inflow problems include low graft pressure even with outflow manually occluded, steal-related ischemia of the extremity, and diminished intra-access flow. Any one of these, paired with imaging confirming the stenosis, supports the intervention; the stenosis percentage alone, without a documented clinical indication, often doesn't.

Commercial and Medicare Advantage plans increasingly layer their own prior authorization requirements on top of traditional Medicare's documentation standard, particularly for non-emergent angioplasty and stent procedures and for the office-based percutaneous fistula creation codes given their high non-facility payment. When a plan does require authorization, the request should include the diagnostic imaging showing the stenosis percentage, the specific clinical indication from the list above, and the prior intervention history for that access site. Track authorization windows by their approval date, typically a fixed 60-to-90-day window from most plans, not by a visit count; a window that expires mid-treatment because nobody was tracking the calendar date is an entirely avoidable denial.

Build the Dialysis Vascular Access Billing Workflow

Treat circuit interventions and fistula/graft creation as two separate coding decisions, even when the same physician performs both in the same practice. The circuit intervention side lives or dies on picking the single highest-value code the session supports and never stacking 36901-36906 together. The creation side lives or dies on getting site-of-service right for 36836/36837 and never itemizing what the code already bundles.

Review denials monthly, sorted by code family, not just by dollar amount. A pattern of medical-necessity denials on repeat angioplasty claims usually points to a documentation gap, missing stenosis percentage or missing clinical indication, that's fixable at the note level. A pattern of bundling denials on 36836/36837 points to a coding-team training gap that's fixable with a one-page reference sheet.

• Pick the single highest-value circuit code. Never bill more than one of 36901-36906 for the same session.
• Confirm site of service before billing 36836/36837. The non-facility and facility rates differ by roughly 25x.
• Document stenosis percentage and clinical indication together. The percentage alone rarely satisfies LCD medical-necessity language.
• Track payer-specific prior authorization windows by date, not visit count. Most run 60-90 days from approval.

Our ESRD dialysis billing guide covers the bundled PPS payment system these procedures sit outside of, and our interventional radiology billing guide walks through the broader endovascular coding fundamentals that apply beyond dialysis access specifically.

Frequently Asked Questions About Dialysis Vascular Access Billing

What does CPT code 36836 include?

CPT 36836 covers percutaneous AV fistula creation in the upper extremity through a single access point, and the code already bundles the vascular access itself, the angiography and imaging guidance, and any fistula maturation or blood-flow redirection technique performed at the same session. Billing those components as separate lines in addition to 36836 is a bundling error, not additional reimbursable work.

Can you bill CPT 36901 and 36902 together?

No. Only one code from the 36901-36906 family is billable per session. CPT 36901 applies only when a fistulogram is the sole intervention performed; if an angioplasty or stent is also done in that session, the single highest-value code supported by the work, such as 36902 or 36903, is the only code billed, not 36901 plus the additional code.

Is dialysis vascular access billing part of the ESRD bundled payment?

No. The ESRD Prospective Payment System bundles routine dialysis services, drugs and labs into a single per-treatment payment, but vascular access procedures such as fistula and graft creation, angioplasty, thrombectomy and stent placement are separately billable physician services reported under their own CPT codes, outside the ESRD PPS bundle.

Does Medicare require documentation of stenosis percentage before paying for angioplasty?

Under Medicare's Local Coverage Determination for dialysis access maintenance, angioplasty is generally considered medically necessary only for hemodynamically significant stenosis, typically at or above 50% of the vessel diameter, and the claim's documentation must clearly state the site and extent of that stenosis. Angioplasty of a vessel not documented as significantly stenosed is not considered medically necessary. LCD specifics are set by jurisdiction, so confirm the exact language with your own Medicare Administrative Contractor.