CPT Codes 37252 and 37253: IVUS Billing Guidelines, Documentation Requirements, and Reimbursement (2026 Guide)
An interventional procedure report documents intravascular ultrasound performed in two locations during the same case — and the billing question isn't just “how many times was IVUS used,” it's whether those two locations actually count as two separately reportable vessels, or whether they're the same vessel imaged twice, or a single lesion that happens to cross into a neighboring segment. CPT 37252 and 37253 look simple on paper — an initial vessel code and an additional-vessel add-on — but the vessel-counting logic behind them is exactly where claims go wrong. Getting it right starts with understanding that these codes are assigned per separately evaluated vessel, not per image, per catheter pass, or per lesion.
In This Article
What Is Intravascular Ultrasound (IVUS)?
IVUS uses a small ultrasound transducer mounted on a catheter, threaded inside a blood vessel, to generate cross-sectional images of the vessel wall from the inside out. This is fundamentally different from conventional external vascular ultrasound, which images the vessel from outside the body through skin and tissue. Because the transducer sits directly inside the vessel, IVUS can show vessel diameter, plaque composition and distribution, lesion characteristics, dissection, and the immediate results of a therapeutic intervention (such as stent apposition) with a level of detail external imaging can't match.
Physicians use IVUS during diagnostic evaluation, therapeutic intervention, or both, in the same vascular procedure — commonly alongside angioplasty, stenting, atherectomy, or diagnostic angiography of noncoronary vessels (arteries and veins outside the heart). Coronary IVUS, used during cardiac catheterization procedures, is reported under an entirely separate set of CPT codes and is not interchangeable with 37252 or 37253, which apply specifically to noncoronary vessels.
CPT 37252 vs. CPT 37253: Understanding the Difference
Per the current AMA CPT code set, 37252 is officially described as “Intravascular ultrasound (non-coronary vessel) during diagnostic evaluation and/or therapeutic intervention, including radiological supervision and interpretation; initial non-coronary vessel (List separately in addition to code for primary procedure),” and 37253 covers “...each additional non-coronary vessel,” with the same add-on instruction.
Comparison | CPT 37252 | CPT 37253 |
Code role | Initial noncoronary vessel | Each additional noncoronary vessel |
Reporting purpose | Reports IVUS performed on the first vessel evaluated during the procedure | Reports IVUS performed on each separately qualifying additional vessel in the same session |
Reporting condition | Always an add-on code; requires an eligible primary procedure code (e.g., a vessel catheterization or angiography code) | Requires 37252 to have been reported first; cannot stand alone; reported once per each additional qualifying vessel |
Unit limits | Reported once per procedure (Medically Unlikely Edit limits quantity to 1) | May be reported multiple times, up to the applicable Medically Unlikely Edit limit (commonly cited at 5 units), one unit per additional vessel |
Practical example: during a single procedure, a physician performs IVUS in the superficial femoral artery (the first, or “initial,” vessel) and separately in the popliteal artery (a distinct, separately evaluated vessel). That's reported as one unit of 37252 for the superficial femoral artery and one unit of 37253 for the popliteal artery — two separately identified vessels, not two images of the same vessel and not two lesions within one vessel.
CPT 37252 and 37253 Billing Guidelines
Both codes are add-on codes and can never be reported as standalone services — they must always accompany an eligible primary procedure code, commonly a vessel catheterization code (in the 36000–36248 range) or an angiography/interventional code. CPT lists a specific, extensive set of eligible primary codes immediately following the 37252/37253 descriptors; confirm the current list rather than assuming any vascular procedure code qualifies.
The single most important coding principle for these codes: units are assigned per separately evaluated vessel, not per image, per lesion, or per catheter pass. If IVUS is performed more than once within the same vessel during the procedure — before and after an intervention, for example — that's still one unit for that vessel, not two. And when an abnormality or lesion extends across the boundary into a contiguous vessel, current coding guidance assigns one IVUS code for that vessel pair rather than reporting each anatomical segment separately — the lesion crossing a boundary doesn't, by itself, create two separately reportable vessels.
A practical workflow for applying this:
1. Review the complete procedure documentation.
2. Identify every vessel actually examined with IVUS.
3. Determine which vessel was the initial one evaluated.
4. Identify which additional vessels were separately, distinctly evaluated (not the same vessel re-imaged, and not a lesion crossing into a contiguous segment).
5. Verify the primary procedure code is eligible to support the add-on codes.
6. Review current NCCI edits and the Medically Unlikely Edit limits for both codes.
7. Submit the claim with the verified units.
Separately, bilateral evaluations (the same type of vessel on both sides of the body) are not reported using modifier 50 — CPT guidance directs billers to count bilateral IVUS evaluations as separate units instead.
Documentation Requirements for IVUS Billing
The medical record should substantiate, where applicable:
• Medical necessity and the clinical indication for the IVUS evaluation
• Relevant pre-procedure findings
• The specific vessel(s) or segments evaluated, identified clearly and distinctly
• The extent of the IVUS examination for each vessel
• IVUS imaging findings and interpretation
• A description of the diagnostic or therapeutic procedure performed alongside IVUS
• The relationship between the IVUS findings and the intervention performed, when applicable
• The physician's procedural and imaging documentation, supporting both the primary procedure and each add-on unit billed
• A final report supporting the specific services billed
“Does the Documentation Support CPT 37252/37253?” Checklist
An educational review checklist — illustrative, not a universal legal requirement, since specific payer rules may differ.
☐ Each vessel evaluated with IVUS is separately and clearly identified in the report
☐ The initial vessel and each additional vessel are distinguishable from each other
☐ No vessel is counted twice for repeat imaging within the same vessel
☐ Any lesion crossing a vessel boundary is reported as one vessel, not two
☐ The eligible primary procedure code is documented and supports the add-on codes
☐ IVUS findings and their clinical relevance are documented
☐ Units billed for 37253 do not exceed the number of genuinely distinct additional vessels evaluated
Common IVUS Billing Mistakes That Can Lead to Claim Denials
These are realistic, preventable risk points — not a guarantee that any specific error will cause a denial, since outcomes vary by payer and circumstance.
Reporting 37253 without an appropriate initial-vessel code
Prevention step: Confirm 37252 is reported before any unit of 37253 for the same procedure.
Confusing lesions with separately reportable vessels
Prevention step: Count distinct vessels, not distinct lesions or abnormalities, when determining units.
Reporting the same vessel more than once without an applicable basis
Prevention step: Confirm repeat imaging within one vessel is billed as a single unit for that vessel.
Missing medical necessity documentation
Prevention step: Confirm the clinical indication for IVUS is clearly documented before coding.
Incomplete procedure or IVUS reports
Prevention step: Flag reports that don't clearly distinguish each vessel evaluated for provider clarification.
Incorrect primary procedure code pairing
Prevention step: Verify the primary code billed is on the current list of codes eligible to support 37252/37253.
Overlooking NCCI edits and code exclusions
Prevention step: Check current NCCI edits and Medically Unlikely Edit limits before submission.
Applying modifiers without adequate justification
Prevention step: Confirm a modifier is actually required and supported by documentation before appending one — remember bilateral evaluations use separate units, not modifier 50.
Failing to verify payer-specific coverage and reimbursement rules
Prevention step: Confirm the specific payer's policy, since some payers have historically treated noncoronary IVUS as investigational for certain indications and may limit coverage.
Accurate IVUS coding requires more than selecting the correct CPT code.
Documentation review, code validation, payer requirements, and claim-level accuracy all play a role in a reliable billing process. Explore Medical Billing Solutions
Medicare Reimbursement for CPT 37252 and 37253 in 2026
Medicare payment for 37252 and 37253 is calculated through the Medicare Physician Fee Schedule using each code's relative value units (RVUs) across work, practice expense, and malpractice components, adjusted by the Geographic Practice Cost Indices (GPCIs) for the specific locality. As add-on codes, both carry their own distinct RVUs tied to the incremental work of each vessel evaluated, separate from the primary procedure's own payment. Facility and nonfacility payment amounts differ, as do payments depending on the site of service and the professional versus facility billing arrangement.
Because locality-adjusted allowed amounts differ meaningfully from a national unadjusted reference, and because facility/ASC reimbursement may follow an entirely different payment system than the physician fee schedule, we recommend checking the current, locality- and setting-specific amounts directly using the CMS Physician Fee Schedule Lookup Tool rather than relying on a single quoted figure. Participating provider status, commercial payer contract terms, and Medicare Advantage plan policies can each produce a different final payment than the standard Medicare Physician Fee Schedule amount — and some payers have historically applied investigational-status coverage limitations to noncoronary IVUS for certain indications, so coverage should never be assumed.
Practical IVUS Claim Review Example
The following is a hypothetical, educational example only — not an actual patient case, provider experience, or claim outcome. During a lower-extremity intervention, a physician performs angioplasty with IVUS guidance in the superficial femoral artery, then separately evaluates the adjacent popliteal artery with IVUS as well, documenting distinct findings for each vessel. The billing team verifies: the primary procedure code (the angioplasty/catheterization code) is eligible to support the add-on codes; the superficial femoral artery is clearly documented as the initial vessel (37252, one unit); the popliteal artery is clearly documented as a separate, additional vessel (37253, one unit); no vessel was counted twice; and the documentation distinguishes the two vessels rather than describing one continuous, boundary-crossing lesion. Only after these checks does the claim go out with both codes.
IVUS Billing Audit Checklist
A quick pre-submission review — routine checks like this help identify coding and documentation issues before they become denials, though following a checklist does not guarantee reimbursement.
☐ Correct CPT code selection confirmed
☐ Initial vessel identified and documented
☐ Additional vessels independently and separately supported
☐ Appropriate primary procedure code verified as eligible
☐ Documentation supports medical necessity
☐ IVUS findings documented for each vessel
☐ Anatomical vessel reporting reviewed (no double-counting, no boundary-crossing errors)
☐ Applicable NCCI edits and MUE limits checked
☐ Payer policy verified, including investigational-coverage considerations
☐ Claim details reviewed before submission
Frequently Asked Questions About CPT 37252 and 37253
What is CPT code 37252 used for?
It reports intravascular ultrasound of the initial noncoronary vessel evaluated during diagnostic evaluation or therapeutic intervention, including radiological supervision and interpretation. It is an add-on code, always reported with an eligible primary procedure.
What is CPT code 37253 used for?
It reports IVUS of each additional noncoronary vessel beyond the initial one, in the same procedure. It's billed once per genuinely separate additional vessel, up to the applicable Medically Unlikely Edit limit.
Can CPT 37253 be billed without CPT 37252?
No. 37253 reports additional vessels beyond the first, so it requires 37252 to have been reported for the initial vessel in the same session; it cannot be billed on its own.
Are CPT 37252 and 37253 add-on codes?
Yes, both are add-on codes. Neither can be reported as a standalone service — both require an eligible primary procedure code, commonly a vessel catheterization or angiography code.
How many times can IVUS be reported for the same vessel?
Generally once per vessel per procedure, regardless of how many times IVUS imaging was performed within that same vessel during the case. Repeated imaging of one vessel does not create additional billable units for that vessel.
What documentation supports IVUS billing?
Clear identification of each vessel evaluated, documented medical necessity, IVUS findings for each vessel, the eligible primary procedure, and a final report that distinguishes the initial vessel from any additional vessels — without conflating lesions with vessels.
How is Medicare reimbursement determined for IVUS services?
Through the Medicare Physician Fee Schedule, using each code's RVUs adjusted by the Geographic Practice Cost Indices for the specific locality, with different amounts for facility versus nonfacility settings. Check the CMS Physician Fee Schedule Lookup Tool for the current, locality-specific amount rather than relying on a general figure.
Strengthen Your IVUS Billing Workflow With Sirius Solutions Global
Accurate IVUS billing comes down to one core discipline: counting vessels, not images, lesions, or catheter passes, and documenting each separately evaluated vessel clearly enough that the claim reflects exactly what was done. Looking to strengthen your medical billing and coding workflow? Sirius Solutions Global helps healthcare organizations manage billing operations, coding workflows, claim reviews, and revenue cycle processes.
Disclaimer
This article is published by the Sirius Solutions Global Editorial Team for general educational purposes only and does not constitute legal, compliance, coding, or payer-specific billing advice for any specific claim or practice. CPT code descriptors, NCCI edits, Medically Unlikely Edit limits, and Medicare payment amounts are updated periodically and are subject to change — always verify current requirements against the current CPT codebook and the applicable payer's current policy before submitting a claim. Code selection and vessel-counting determinations for a specific procedure must be based on the actual documented findings and should be made or reviewed by a qualified, credentialed medical coder. Some payers may consider noncoronary IVUS investigational for certain indications; coverage should never be assumed. Reimbursement figures vary by payer, locality, setting, and contract terms; verify current amounts directly using the CMS Physician Fee Schedule Lookup Tool or the applicable payer's fee schedule. Sirius Solutions Global makes no guarantee regarding claim approval, reimbursement amounts, or audit outcomes, and this content should not be treated as a substitute for official AMA/CMS guidance, applicable payer policy, or independent compliance review.
