CPT code 37248 – Venous angioplasty, first vessel

Key takeaways

CPT code 37248 covers balloon angioplasty of the first vein treated, and add-on code 37249 is reported for each additional vein in the same session.

37248 applies to peripheral and central veins outside the dialysis circuit, while angioplasty inside the circuit is reported with 36902 (peripheral) or 36907 (central).

The descriptor bundles all imaging for the dilation, so fluoroscopy isn’t billed separately, though intravascular ultrasound (37252) still can be.

Documentation must capture balloon size, inflation pressures, stenosis degree, and pre- and post-intervention imaging to survive medical necessity review.

Pabau’s claims management software validates claims for missing details and connects to Claim.MD for eligibility checks and submission to thousands of US payers.

CPT code 37248: Official descriptor and procedure overview

CPT code 37248 is the American Medical Association (AMA) code for balloon angioplasty of the first vein treated in a session, outside the dialysis circuit. The official descriptor reads, clause by clause:

• Transluminal balloon angioplasty (except dialysis circuit), open or percutaneous,
• including all imaging and radiological supervision and interpretation necessary to perform the angioplasty within the same vein;
• initial vein.

Interventional radiologists and vascular surgeons bill 37248 when a catheter-mounted balloon is advanced to a narrowed vein segment. The balloon is inflated to restore luminal diameter, then deflated before withdrawal.

The code covers the balloon work itself, plus the imaging, supervision, and interpretation needed to perform the dilation in that vein.

• Procedure category: Open or percutaneous vascular interventions, venous subsection
• Code family: 37248 (primary, first vessel) / 37249 (add-on, each additional vessel)
• Clinical settings: Interventional radiology suite, vascular surgery OR, interventional nephrology lab
• Typical indications: Venous outflow stenosis, central venous occlusion, non-dialysis peripheral vein stenosis

What the procedure covers: Included services and components

Coders frequently over-bill 37248 by separately reporting services that the AMA considers bundled into the base work. The following components are included in CPT code 37248 and cannot be billed independently:

• Balloon catheter advancement, inflation, and deflation at the treated vessel
• Roadmapping angiography (contrast injections used to guide balloon placement)
• Venous access and closure at the treated vessel’s access site
• Routine post-procedure completion angiography confirming result
• Fluoroscopic guidance and radiological supervision and interpretation for the dilation

What is separately billable: Intravascular ultrasound (CPT 37252 for the first vessel, 37253 for each additional) is reportable when performed and documented. Fluoroscopy is not, because the 37248 descriptor already includes all imaging needed for the angioplasty. Verify current NCCI edits quarterly, as CMS updates bundling rules on a rolling basis.

CPT 37248 vs 37249: Primary code vs add-on code

CPT 37249 is the add-on code that extends the 37248 encounter. Report it once for each additional vein treated in the same operative session. It cannot be reported alone and cannot be billed without 37248 as the parent code.

The most frequent mistake: Billing 37249 without documenting each additional vessel as a distinct anatomic site treated. Payers audit this aggressively. The operative note must name the second (and third, if applicable) vessel, its stenosis degree, the balloon used, and the post-dilation result. A note that references “multiple sites” without specifics will trigger a rollback to a single unit of 37248.

CPT 37248 vs 37246: Venous vs arterial angioplasty

CPT 37246 and 37247 cover the arterial angioplasty family, and CPT 37248 and 37249 are the venous equivalents. Routing a venous angioplasty to 37246 (or vice versa) is a coding error.

The venous diagnosis on the claim won’t support an arterial code, which can draw a CO-11 denial. Repeated mismatches can flag the practice for miscoding on audit.

Companion and add-on codes commonly billed with CPT code 37248

Several codes can be legitimately appended to a 37248 encounter. Use the AAPC Codify CPT lookup to verify current NCCI bundling edits before billing any combination, as pairing rules update quarterly.

Dialysis access use: AV fistula, AV graft, and the 36902/36907 distinction

Dialysis access cases cause the most routing errors on 37248. The 2017 CPT update created a dedicated code family (36901-36909) for percutaneous interventions on dialysis circuits, and the 37248 descriptor now excludes the circuit.

Angioplasty inside the circuit is reported with 36902 for the peripheral segment, plus add-on 36907 when a central segment is treated. The diagram below walks through the routing, and the table after it covers the common scenarios.

When in doubt, review the operative note for whether access was gained through the dialysis circuit itself. If the catheter entered via the fistula or graft access site, the 36901-36909 family applies. If accessed independently, 37248 is the appropriate primary code.

ICD-10 diagnosis codes that support CPT code 37248

Every claim for CPT code 37248 must link to an ICD-10-CM diagnosis code that establishes medical necessity. The following codes are most commonly submitted alongside 37248. Use the current fiscal year’s ICD-10-CM edition, and verify codes against the CDC/NCHS tabular list before each claim submission.

Documentation requirements for CPT code 37248

Payers reviewing CPT code 37248 claims check the operative note for seven specific elements. Missing any one of them is the leading cause of medical necessity denials for this code. A structured procedure note using a superbill documentation workflow reduces this risk substantially.

These are the elements auditors check. Build them into your procedure note template:

1. Vessel identification: Name the specific vein treated (e.g. “right subclavian vein”, “left external iliac vein”). “A vein” or “venous outflow” does not survive audit.
2. Stenosis degree: Express as a percentage of luminal narrowing confirmed on pre-intervention imaging (e.g. “75% stenosis of the right innominate vein on digital subtraction angiography”).
3. Balloon specification: Record the balloon catheter’s diameter and length (e.g. “8 mm x 4 cm balloon catheter”).
4. Inflation pressures: Document the pressure in atmospheres reached during each inflation cycle (e.g. “inflated to 12 atmospheres for 90 seconds, three cycles”).
5. Pre-intervention imaging findings: Confirm the stenosis grade on angiography or IVUS before dilation.
6. Post-intervention result: Document residual stenosis percentage and flow improvement on completion angiography (e.g. “residual stenosis less than 20%”).
7. Additional vessels: For each vessel reported under 37249, repeat elements 1-6 for that anatomic site explicitly.

A clean claim submission for 37248 pairs the operative note with a supporting diagnosis code and confirmed prior authorization where required. The correct modifier goes on at the line-item level.

Prior authorization: Payer requirements before billing CPT code 37248

Authorization requirements vary significantly by payer. The medical billing process for venous angioplasty requires confirming each payer’s current policy before scheduling, not after the procedure. Here is the general framework by payer category:

• Medicare (traditional fee-for-service): Generally does not require prior authorization for therapeutic vascular interventions, including CPT code 37248. Medical necessity documentation in the claim record is the primary compliance mechanism. Verify with the relevant Medicare Administrative Contractor (MAC) for jurisdiction-specific policies.
• Medicare Advantage plans: Authorization requirements vary by plan. Many MA plans require prior authorization for interventional procedures, so contact the plan before the case.
• Medicaid: State-specific. Most states require prior authorization for elective vascular interventions. Emergency procedures may be post-authorized.
• Commercial payers: Typically require prior authorization plus supporting clinical evidence. Expect to send pre-procedure imaging showing stenosis greater than 50% (many payers specify 50-70%). Add symptom documentation (arm edema, access dysfunction, elevated venous pressures) and prior conservative management failure where applicable.

A prior authorization request for CPT code 37248 should carry the access imaging report and the duplex ultrasound or venogram findings. Add the treating physician’s notes documenting the indication, plus access flow measurements for dialysis patients.

Medicare reimbursement: RVU values and payment rates for CPT 37248

Medicare reimbursement for CPT code 37248 is calculated from the CMS Physician Fee Schedule using relative value units (RVUs). Rates are updated annually and adjusted by locality through the Geographic Practice Cost Index (GPCI).

The table below shows how each component behaves. Pull current-year values from the CMS lookup tool before quoting reimbursement to billing staff.

Use the FastRVU lookup tool to pull current work, practice expense, and malpractice RVU values for CPT 37248 by locality.

Common denial reasons for CPT code 37248 and how to appeal

Effective denial management workflows for CPT code 37248 start with knowing which denial reason codes appear most often. Each denial type has a distinct appeal path.

• CO-97 (service included in another code): Usually a bundling denial, most often from billing 37248 alongside 36902 or 36907 for the same dialysis circuit intervention. Appeal with documentation confirming the treated vein sits outside the circuit. It also occurs when fluoroscopy such as 77001 is billed on top of 37248, which already includes the imaging.
• CO-4 (code inconsistent with the modifier, or modifier missing): Usually a 37248 line that NCCI bundles with another code. It went out without -59 or an X modifier. A laterality modifier the payer doesn’t accept causes it too. Correct the modifier and refile, with the operative note showing the distinct service.
• CO-11 (diagnosis inconsistent with the procedure): Often an arterial vs venous mismatch. If the procedure was venous and the claim went out on 37246, correct and refile with 37248. Include the operative note confirming the vessel type.
• CO-50 (medical necessity not established): The claim lacked a supporting ICD-10 code or the linked diagnosis does not justify the procedure under the payer’s LCD. Appeal with the pre-procedure imaging report and physician’s clinical rationale letter. Attaching the specific LCD criteria and mapping each criterion to the clinical record is the most effective strategy.
• Missing prior authorization (CO-15): Commercial payer authorization was not obtained or was obtained for a different code. If the authorization references 37246 but the claim has 37248, request an authorization correction from the payer before refiling. Prevention: Always confirm authorization covers the exact CPT code.
• 37249 unit count mismatch: Billing multiple units of 37249 without per-vessel documentation in the operative note. Appeal by submitting the procedure note with each additional vessel’s treatment explicitly documented as a separate paragraph.

Review common denial codes to build a denial prevention protocol across your vascular billing team.

Modifiers for CPT 37248: When and how to append them

Modifier selection for CPT code 37248 affects both claim processing speed and audit risk. Use the right modifier for the right situation, and document the clinical rationale in the note.

Effective medical billing compliance programs include a modifier audit checklist reviewed quarterly alongside the NCCI edit updates. Good claims management software flags modifier mismatches at the point of claim creation before submission.

How claims management software catches 37248 errors before submission

Every 37248 denial in this guide is set before the claim leaves the practice. A vessel-type mismatch, a missing modifier, or an authorization filed against the wrong code is already on the claim line. Catching those by hand means a coder rereading each operative note against the claim.

Pabau, the practice management platform we build, raises the claim straight from the invoice and runs claim validation on it first. Missing or invalid details get flagged before submission, so each fix takes seconds instead of an appeal cycle.

Prior authorizations are stored as cases that follow the appointment through to the claim, and any claim still missing a code is flagged. Through the Claim.MD integration, you can check eligibility in real time and submit claims to thousands of US payers. Claim statuses and remittances come back into Pabau, with rejected claims flagged for rework.

Catch vascular claim errors before submission

Pabau validates claims for missing or invalid details, checks patient eligibility in real time through Claim.MD, and tracks each claim to payment. Less rework, faster reimbursement.

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Conclusion

Code 37248 rewards practices that settle routing in the operative note template, before the case reaches the coding desk. The template should answer two questions explicitly: is the treated vessel a vein, and does it sit inside a dialysis circuit?

The trade-off is a slightly longer note. Balloon size, inflation pressures, and pre- and post-dilation imaging take a minute to record. They’re also what a reviewer reads first when a claim is questioned. Skip them and a correctly coded 37248 can still be denied.

Book a demo to see how Pabau validates vascular claims and tracks them from submission to remittance.

Continue your research

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