CPT code 36905 – Dialysis thrombectomy with angioplasty

Key takeaways

CPT Code 36905 reports thrombectomy and/or thrombolysis of a clotted dialysis circuit plus balloon angioplasty of the peripheral dialysis segment.

The decision that matters is 36904 versus 36905: thrombectomy alone is 36904, and thrombectomy with peripheral angioplasty of a stenosis is 36905.

Only one base code from 36901-36906 is reported per session, so 36901, 36902 and 36903 are never billed with 36905.

Diagnostic angiography, fluoroscopic guidance and catheter placement are included in 36905, while central segment work and embolization go on add-ons +36907 to +36909.

A clean 36905 claim depends on an op note that documents both the thrombus and the stenosis that needed dilation.

CPT Code 36905: Official descriptor and procedure overview

CPT Code 36905 reports percutaneous mechanical thrombectomy and/or thrombolytic infusion of a clotted dialysis circuit, combined with balloon angioplasty of the peripheral dialysis segment. The angioplasty is bundled into the code, so it is never billed on its own line. The code applies to native arteriovenous fistulas (AVF) and synthetic arteriovenous grafts (AVG). It belongs to the American Medical Association (AMA) CPT code set. Balloon angioplasty of a vein outside the dialysis circuit is a different service, reported with CPT 37248.

The summary above follows the descriptor as reproduced in the American College of Surgeons 2017 dialysis coding bulletin. Therefore, confirm it against your current CPT book before you load it into a charge master.

The phrase “and/or infusion for thrombolysis” means 36905 covers mechanical declot devices, pharmacological thrombolysis, or both in one session. Either technique qualifies, as long as a stenosis in the peripheral segment is also dilated. By contrast, thrombectomy with no angioplasty is 36904, and thrombectomy with a peripheral stent is 36906.

Clinical steps behind the procedure

The procedure sequence shows why so much of the session is already inside the code. A clotted circuit intervention reported with 36905 usually runs in this order.

1. Access puncture: The physician punctures the thrombosed AVF or AVG and places the catheter. Catheter placement is also included in 36905.
2. Diagnostic angiography: Contrast imaging maps the thrombus and the outflow. This angiography is included in 36905, so it is never reported as 36901.
3. Thrombectomy or thrombolysis: The physician removes the clot mechanically, infuses a thrombolytic agent, or combines both methods.
4. Peripheral angioplasty: A stenosis found before or after clot removal is dilated with a balloon. This step is what separates 36905 from 36904.
5. Completion imaging: Final images confirm restored flow. They are also included in the code.
6. Hemostasis: Access sites are closed with compression or a closure device, which is also included.

One detail trips up op notes. Per the ACS bulletin, inflating a balloon only to push clot centrally is not angioplasty. Therefore, if no stenosis was treated, the session is 36904, whatever devices were used.

The 36901-36909 dialysis circuit code family

In 2017 the CPT Editorial Panel replaced the old dialysis access codes with nine bundled codes. Six are base codes arranged in two ladders, and three are add-ons. For a peripheral angioplasty with no thrombus, see the 36902 guide. In addition, the table below maps the full family.

Only one base code from 36901-36906 is reported per session. Each code includes the work of the codes below it on its ladder, as the grid below shows. Add-ons +36907 to +36909 then sit on top of whichever base code applies.

36905 vs. 36904: Choosing the right thrombectomy code

Both codes start with a thrombosed circuit and the same declot work. The difference is the peripheral segment angioplasty. If a stenosis is identified and dilated, report 36905. Otherwise, if the clot is cleared and no stenosis needs treatment, report 36904.

Also, the number of balloons or inflations does not change the code. Like 36902, 36905 covers all angioplasty in the peripheral segment for that session.

36905 vs. 36906: When a stent replaces angioplasty

If a stent is placed in the peripheral segment during the thrombectomy, report 36906 instead of 36905. 36906 includes all peripheral angioplasty in the session, so 36905 and 36906 are never reported together.

Add-on codes +36907, +36908 and +36909 with 36905

For thrombectomy coding, clot removal from the central veins is still part of 36905. However, central segment angioplasty after a successful declot is reported separately with +36907. A central stent is +36908, which includes the central angioplasty, so +36907 drops off. Finally, embolization of a side branch or accessory vein is +36909. The op note should name each treated segment separately.

What CPT Code 36905 includes (bundled services)

The 36905 descriptor and the CPT guidelines for the family include the following services. As a result, none of them is billed separately with 36905.

• Diagnostic angiography of the circuit: The fistulogram is included, so 36901 is not reported with 36905.
• Fluoroscopic guidance and imaging: All imaging and radiological supervision and interpretation for the thrombectomy and the peripheral angioplasty are included.
• Catheter placement: All needle and catheter placements within the circuit are part of the code.
• Thrombolytic injections: Intraprocedural pharmacological thrombolytic injections are included.
• Peripheral angioplasty: Every balloon dilation in the peripheral segment during the session is included.
• Central clot removal: Thrombus that extends into the central veins is cleared under 36905 without a separate code.

Separately reportable services with CPT Code 36905

A few services in the same session can be billed in addition to 36905 when the documentation supports them.

Diagnostic angiography is included in 36904-36906. A thorough pre-intervention fistulogram in the same session therefore does not create a second base code.

Medicare reimbursement for CPT Code 36905

Medicare pays physicians for 36905 under the Medicare Physician Fee Schedule (MPFS). Coverage follows the relevant Medicare Administrative Contractor (MAC) LCD or any national coverage determination, plus documented medical necessity. Rates change every year, so check the current CMS fee schedule rather than a saved figure.

Work RVU and fee schedule values

The MPFS sets separate payment for facility settings, such as hospital outpatient departments and ASCs, and non-facility settings, such as office-based labs. The work RVU for 36905 sits above 36904, because it includes the added angioplasty. Then pull current RVUs and national payment amounts from the CMS Physician Fee Schedule look-up tool or the CMS RVU file.

The zero global period means no post-procedure care beyond the day of service is bundled into 36905. However, separate follow-up visits may be billed with the matching E/M codes when documentation supports them.

Prior authorization requirements for CPT Code 36905

Original Medicare does not list 36905 in its hospital outpatient prior authorization program. However, many commercial payers, Medicare Advantage plans and Medicaid managed care plans set their own rules, and those rules vary by plan.

First, check each payer’s authorization rules before scheduling. When a plan requires authorization, billers typically submit the following.

• Imaging or clinical findings confirming a thrombosed access
• The physician order and clinical rationale for the intervention
• Recent access flow studies or access monitoring results
• Documentation of failed conservative management where applicable
• The patient’s diagnosis and dialysis history, including ESRD status where the plan asks for it

Also, confirm authorization rules at the plan level, not just the payer level. One payer may require it on some products and exempt others. Finally, keep the payer’s written answer on file in case of a later denial.

Documentation requirements to support CPT Code 36905

A 36905 claim stands on the procedure note. Because generic templates lack circuit-specific detail, they leave the code exposed on review. The note should cover each of the following elements.

• Access type and location: State whether the access is a native AVF or an AVG, and where it sits (for example, left radiocephalic fistula).
• Thrombosis: Document the imaging findings or clinical signs that confirmed thrombus. “Clotted graft” with no supporting detail is weak.
• Technique: Name the mechanical device or thrombolytic agent used.
• Stenosis and angioplasty: Describe the peripheral stenosis, the balloon size and the result. Without this, the session supports 36904, not 36905.
• Thrombus extent: Describe how far the clot extended and which segments were cleared.
• Outcome: Record whether flow was restored and the final imaging appearance.
• Complications: Note any complications, or state that none occurred.
• Add-on work: If +36907, +36908 or +36909 is billed, describe each central segment or branch vessel treated.

A superbill that maps each code to its documented indication at the time of billing cuts documentation requests. Clean claim submission for 36905 also depends on the code matching what the note describes.

ICD-10-CM codes that commonly support 36905

The diagnosis codes below are illustrative examples, not a coverage list. Therefore, check the relevant LCD and the current ICD-10-CM tabular list before you submit.

Common denial reasons and how to prevent them

Effective dialysis claim denial management starts with the reason behind each denial, not a blind resubmission. The table below maps common 36905 denials to their causes and fixes.

The CARC and RARC codes on the remittance name the reason for each denial, and our billers’ denial code guide maps them to a fix. Tracking denial patterns through revenue cycle management reporting shows coding teams where an error repeats. Fixing the root cause once stops repeat denials.

Modifier usage with CPT Code 36905

Modifier choice depends on the setting and on what the edit tables say for the code pair. Overall, the table below summarizes the common cases for 36905.

LT and RT modifiers are not part of the 36905 descriptor. Instead, the access is identified by anatomic description in the note. Follow your payer’s instructions if it asks for a laterality modifier.

How Pabau supports clean 36905 claims

Dialysis circuit claims fail on small mismatches. The base code is wrong, an add-on is missing, or the note describes a different session than the claim. Pabau, the practice management and billing platform we build, keeps the procedure note, the codes and the claim on one patient record.

Pabau’s claims management software submits US claims through the Claim.MD clearinghouse. Your team can track each claim’s status and receive ERAs back in Pabau, so a 36905 denial is visible as soon as the remittance arrives.

Coding decisions stay with your coders. Instead, Pabau gives them one place to see the note, the submitted codes and the payer’s response. That makes the 36904 versus 36905 question easier to check before resubmission.

Track every dialysis circuit claim in one place

Pabau submits your 36905 claims through the Claim.MD clearinghouse, tracks their status and returns ERAs to the patient record. Your team sees denials as soon as they arrive.

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Conclusion

CPT Code 36905 pays for two pieces of work in one session: clearing the clot and dilating a peripheral stenosis. However, the second piece has to be in the note. Most coding errors in this family come from picking the wrong rung of the ladder.

Build your review around one question: was a peripheral stenosis dilated, stented, or left alone? That answer picks 36905, 36906 or 36904. Then add central work and embolization as add-ons, and leave 36901-36903 off the claim.

Book a demo to see how Pabau keeps dialysis circuit notes, claims and remittances together for your practice.

Continue your research

Need a framework for handling claim rejections across all procedure codes? Denial management in healthcare covers root-cause analysis and appeal workflows for high-volume billing teams.

Submitting dialysis circuit claims through a clearinghouse for the first time? How medical claims clearinghouses work explains EDI transmission, eligibility checks, and ERA routing.

Looking for the 837P file structure behind your 36905 submissions? 837 electronic claim file guide breaks down the transaction set fields that payers validate at intake.

Frequently asked questions