🩸 CPT 36832 — Revision, Open, Arteriovenous Fistula, Without Thrombectomy
Quick Reference
wRVU: 13.16¹ | Global Period: 090 | Assistant Payable: Yes | Bilateral Indicator: 1 Rule: CPT 36832 specifically excludes thrombectomy — if a clot is removed during the same session, 36833 applies instead since it bundles revision with thrombectomy ². The revision must be performed via an open surgical approach; percutaneous endovascular revision procedures are reported with different codes. This code applies equally to autogenous fistulas and nonautogenous (synthetic) dialysis grafts.
📋 Clinical Description
CPT 36832 describes an open surgical revision of an existing arteriovenous fistula or dialysis graft to correct flow-limiting problems such as stenosis, aneurysm, or structural failure, performed without concurrent thrombectomy. This distinguishes it from 36833, which describes the same open revision but performed with thrombectomy when a clot is also present and removed.
Compared to 36901 and related endovascular codes, which address similar access dysfunction through a percutaneous, catheter-based approach, 36832 is reserved for a true open surgical revision requiring direct surgical exposure of the fistula or graft. It is also distinguished from 36825 (creation of a new arteriovenous fistula), since 36832 addresses an already-existing, previously functioning access rather than creating a new one.
Clinical contexts:
- stenosis at the venous outflow or anastomotic site of an existing fistula or graft causing declining dialysis flow rates.
- Aneurysmal degeneration of a fistula requiring open surgical repair to prevent rupture.
- Structural graft failure or kinking requiring open revision to restore adequate access function.
- Recurrent access dysfunction after failed percutaneous angioplasty, requiring conversion to an open surgical approach.
- Revision surgery performed proactively to extend the functional lifespan of a maturing or aging access site.
🔬 Anatomical & Procedural Considerations
| Variant | Mechanism | Key Notes |
|---|---|---|
| Autogenous Fistula Revision | The surgeon directly exposes the patient’s own vein-based fistula and surgically corrects the identified defect, such as excising a stenotic segment or repairing an aneurysm. | Autogenous fistulas generally have better long-term patency, but stenosis at the anastomosis remains a common revision indication. |
| Nonautogenous Graft Revision | The surgeon exposes a synthetic (prosthetic) dialysis graft and performs an open revision, such as patch angioplasty or segment replacement, to restore adequate flow. | Synthetic grafts have a higher rate of intimal hyperplasia at the venous anastomosis, often necessitating revision. |
| Non-Thrombectomy Revision | The revision addresses structural or flow-limiting problems without the presence of a clot requiring removal. | If a thrombus is discovered and removed during the same operative session, the correct code becomes 36833 instead of 36832². |
Clinical Pearl
✅ Procedure Includes
- Open surgical exposure of the existing arteriovenous fistula or graft.
- Identification and correction of the flow-limiting defect (stenosis, aneurysm, kink, or structural failure).
- Patch angioplasty, segment revision, or anastomotic repair as needed.
- Hemostasis and closure of the surgical site.
- Intraoperative assessment of restored flow.
❌ Excludes / Do Not Report Together
| Code | Description | Relationship |
|---|---|---|
| 36833 | Revision, open, arteriovenous fistula; with thrombectomy, autogenous or nonautogenous dialysis graft | Used instead of 36832 when a thrombectomy is also performed during the same open revision². |
| 36825 | Creation of arteriovenous fistula by other than direct arteriovenous anastomosis (separate procedure); autogenous graft | Represents creation of a new access, not revision of an existing one; not reported together for the same access site in the same session. |
| 36901 | Introduction of needle and/or catheter, dialysis circuit, with diagnostic angiography | Represents a percutaneous, catheter-based approach rather than an open surgical revision; not interchangeable with 36832. |
Bundling Alert
The 090-day global period bundles routine postoperative visits, wound checks, and access flow monitoring tied to expected recovery within 90 days. An unplanned return to the OR for early access failure or bleeding requires modifier -78, while a planned staged revision requires modifier -58. Audit risk increases when 36832 is billed but the operative note actually documents thrombus removal, which would require 36833 instead.
🌳 Code Tree — Surgery: Hemodialysis Access
CPT 36800-36861 Hemodialysis Access, Cannulation, Shunt Insertion, Fistula
│
├── 36800-36821 Cannula Insertion / AV Anastomosis
│ ├── 36800 Insertion of cannula for hemodialysis, other purpose (separate procedure); vein to vein
│ └── 36818 Arteriovenous anastomosis, open; by upper arm cephalic vein transposition
│
├── 36825-36830 Fistula/Graft Creation
│ └── 36825 Creation of arteriovenous fistula by other than direct arteriovenous anastomosis (separate procedure); autogenous graft
│
└── 36831-36833 Thrombectomy/Revision (Dialysis Access)
├── 36831 Thrombectomy, open, arteriovenous fistula without revision, autogenous or nonautogenous dialysis graft
├── ▶▶ 36832 ◀◀ Revision, open, arteriovenous fistula; without thrombectomy, autogenous or nonautogenous dialysis graft ← YOU ARE HERE (Global: 090)
└── 36833 Revision, open, arteriovenous fistula; with thrombectomy, autogenous or nonautogenous dialysis graft💰 RVU & Reimbursement Profile
| Component | Value |
|---|---|
| Work RVU | 13.16¹ |
| Global Period | 090 |
| Bilateral Indicator | 1 |
| Assistant Surgeon | Payable |
| Co-Surgeon | Rarely applicable |
| Team Surgery | Not typically applicable |
| PC/TC Split | 0 |
| Modifier -51 Exempt | No |
| Anesthesia | Local, regional, or general depending on complexity; billed separately |
Bilateral Billing Rules
A bilateral indicator of 1 means payment adjustment rules apply if a patient has functioning dialysis access sites on both upper extremities requiring revision in the same session, so modifier -50 may be appropriate with clear documentation. This scenario is uncommon since most patients maintain a single primary access site at a time. Confirm true bilateral medical necessity is documented, since payers may question why two separate access revisions were required simultaneously.
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -22 | Increased Procedural Services | For revision cases with extensive scarring from multiple prior procedures requiring substantially more operative work than typical. |
| -52 | Reduced Services | When the planned revision was less extensive than typical or was not fully completed. |
| -58 | Staged/Related Procedure | When a planned staged revision is performed within the global period of a prior related access procedure. |
| -76 | Repeat Procedure by Same Physician | When the same revision procedure must be repeated by the same provider due to early re-failure. |
| -78 | Return to Operating Room | For an unplanned, related return to the OR within the global period, such as for bleeding or early access failure. |
| -79 | Unrelated Procedure | For an unrelated procedure performed by the same surgeon during the global period. |
🩺 Common ICD‑10‑CM Pairings
Primary Diagnosis Group
| ICD‑10 | Description | HCC? | Notes |
|---|---|---|---|
| T82.590A | Other mechanical complication of vascular dialysis catheter, initial encounter | No | A common primary diagnosis capturing a broad range of structural fistula or graft failures requiring open revision. |
| N18.6 | End stage renal disease | Yes | Documents the underlying dialysis dependence that necessitates ongoing access maintenance procedures. |
Secondary Group
| ICD‑10 | Description | HCC? | Notes |
|---|---|---|---|
| Z99.2 | Dependence on renal dialysis | No | Reflects the patient’s ongoing dialysis dependence status supporting the need for access revision. |
Etiology / Complication
| ICD‑10 | Description | HCC? | Notes |
|---|---|---|---|
| I77.1 | Stricture of artery | No | May support documentation when the underlying defect is a true arterial stricture at the anastomosis site. |
Coding Specificity Reminder
Always document the precise nature of the access dysfunction (stenosis, aneurysm, kink) rather than defaulting to a vague mechanical complication code when the operative note supports greater specificity. Confirm end stage renal disease and dialysis dependence status are captured as secondary diagnoses, since these significantly affect risk adjustment and medical necessity documentation for repeated access maintenance procedures.
🏥 MS‑DRG Considerations
Inpatient 36832 typically groups to a vascular procedures DRG reflecting dialysis access maintenance rather than major vascular reconstruction, since this is a relatively focused revision procedure rather than a de novo vascular reconstruction. Accurate capture of end stage renal disease, dialysis dependence, and any access-related complications as secondary diagnoses supports appropriate DRG assignment for the encompassing admission.
🔧 ICD‑10‑PCS Equivalents
| PCS Code | Full Description | Modality |
|---|---|---|
| 031Q0ZZ | Bypass upper arm artery to upper arm vein, open approach | Reflects open revision of the arterial inflow component |
| 041Q0ZZ | Bypass upper arm artery to lower arm vein, open approach | Alternate open revision configuration depending on anatomy |
| 05WY0JZ | Revision of synthetic substitute in upper vein, open approach | Reflects graft revision component for nonautogenous access |
| 06WY0JZ | Revision of synthetic substitute in lower vein, open approach | Alternate graft revision site depending on anatomy |
PCS Character Analysis
| Position | Character | Value | Definition |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical section. |
| 2 | Body System | 3 or 4 or 5 | Upper arteries, lower arteries, or upper veins, depending on the specific access site revised. |
| 3 | Root Operation | W | Revision — correcting, to the extent possible, a malfunctioning or displaced device or portion of a body part, matching the open revision procedure. |
| 4 | Body Part | Y (or specific vessel) | Upper vein or specific named vessel depending on the exact anatomic location of the revision. |
| 5 | Approach | 0 | Open approach, matching the surgical exposure technique. |
| 6 | Device | J | Synthetic substitute, reflecting a graft component, when applicable; autogenous revisions may use a different device value. |
| 7 | Qualifier | Z | No qualifier needed. |
Root Operation Comparison
Revision (W) is used because the procedure corrects a malfunctioning existing device or vascular structure rather than creating an entirely new pathway, distinguishing it from Bypass (1), which would apply to creation of a new route around an obstruction. Coders should select the specific body part and device value based on whether the access is autogenous (vein-based) or nonautogenous (synthetic graft-based), since this changes the device character significantly.
📝 Coding Examples
Example 1
Clinical Scenario: A 62-year-old male with end stage renal disease and a maturing radiocephalic fistula develops declining dialysis flow rates due to venous outflow stenosis. He undergoes open surgical revision with patch angioplasty of the stenotic segment, without any thrombus present or removed.
| Field | Code | Rationale |
|---|---|---|
| CPT | 36832 | Captures the open revision without thrombectomy, matching the absence of clot in this case. |
| PDx | T82.590A | Documents the mechanical complication of the vascular access requiring revision. |
Note
Confirm the operative note explicitly states no thrombus was found or removed, since any thrombectomy performed would change the correct code to 36833.
Example 2
Clinical Scenario: A 70-year-old female with a nonautogenous forearm dialysis graft develops an aneurysmal segment at the venous anastomosis. She undergoes open surgical revision with segment excision and graft interposition, with no thrombus identified during the procedure.
| Field | Code | Rationale |
|---|---|---|
| CPT | 36832 | Reflects the nonautogenous graft revision performed without thrombectomy. |
| PDx | T82.590A | Documents the mechanical complication (aneurysmal degeneration) of the dialysis graft. |
Note
Nonautogenous graft revisions are coded identically to autogenous fistula revisions under 36832, since the code descriptor covers both access types.
Example 3
Clinical Scenario: A 58-year-old male undergoes open revision of his arteriovenous fistula for stenosis without thrombectomy. Twelve days postoperatively, within the global period, he develops early re-stenosis and returns to the OR for a planned staged revision.
| Field | Code | Rationale |
|---|---|---|
| CPT | 36832-58 | Reports the planned staged revision performed within the global period of the index surgery. |
| PDx | T82.590A | Continues to document the mechanical complication requiring ongoing access revision. |
Global period reminder
Modifier -58 is required to indicate the staged, planned nature of the second revision and to override the global period bundling edit that would otherwise deny separate payment.
⚠️ Common Coding Pitfalls
- Reporting 36832 when a thrombus was actually identified and removed during the procedure, which requires 36833 instead².
- Confusing open surgical revision (36832) with percutaneous endovascular revision procedures, which are coded differently.
- Failing to append modifier -58 for a planned staged revision performed within the global period.
- Using a vague mechanical complication code when the operative note supports a more specific diagnosis such as stenosis or aneurysm.
- Overlooking documentation of end stage renal disease and dialysis dependence as secondary diagnoses, weakening HCC capture and medical necessity support.
- Applying modifier -50 for bilateral billing without clear documentation of true bilateral access revision necessity.
**Sources:** 1. fastrvu.com. "CPT 36832 (Av fistula revision open) work RVU and Medicare payment." 2026. 2. AAPC. "CPT® Code 36832 - Hemodialysis Access, Intervascular Cannulation for Extracorporeal Circulation, or Shunt Insertion Procedures." AAPC Codify, 2026 code changes reviewed. 3. Find-A-Code. "CPT® 36832 in section: Revision, open, arteriovenous fistula." 2026.