CPT Code 01925: Anesthesia for carotid or coronary interventional radiology

Key Takeaways

CPT Code 01925 describes anesthesia for therapeutic interventional radiological procedures involving the arterial system, specifically carotid or coronary vessels.

The code carries 7.0 base units under the VA and CMS anesthesia schedules; confirm annually against the current ASA Relative Value Guide.

Physical status modifiers (P1-P6) are required on every 01925 claim; omitting or misassigning them is among the most common denial triggers.

Pabau’s claims management software automates time-unit calculations and modifier tracking, reducing manual billing errors on high-complexity anesthesia claims.

CPT Code 01925 applies to anesthesia provided during therapeutic interventional radiology procedures on the carotid or coronary arteries, and it carries 7.0 base units, a different value than the codes around it in the 01916-01942 range. Getting the code, modifiers, and supporting documentation right on the first submission is what determines whether a high-complexity anesthesia claim gets paid at that rate or comes back denied.

This guide covers how to calculate base and time units for 01925, which modifiers and qualifying circumstance codes apply, what documentation payers expect, and how the code differs from neighbors like 01924 and 01926. Practices working through the fundamentals of medical billing more broadly, or billing for other interventional radiology procedures like CCSD XR121, will find the same principles apply here.

CPT Code 01925: definition and clinical description

CPT Code 01925 identifies anesthesia services provided during therapeutic interventional radiological procedures on the carotid or coronary arterial system. Claims submitted without a matching diagnosis and correct modifier combination are routinely denied by Medicare and commercial payers.

The code sits within the CPT range 01916-01942, which the American Medical Association (AMA) groups under “Anesthesia for Radiological Procedures.” Practices using claims management software can embed code-specific rules directly into their billing workflows, catching modifier gaps before claims leave the practice.

The descriptor specifically covers carotid angioplasty, coronary angioplasty, and related therapeutic (not diagnostic) arterial interventions performed under imaging guidance. Angioplasty catheters used during these interventions, such as HCPCS C1725, are billed separately from the anesthesia code itself. Diagnostic arteriography is coded separately under CPT 01916.

CPT Code 01925 base units and anesthesia time-unit calculation

Anesthesia billing differs from standard procedure billing. Instead of a single RVU, reimbursement is calculated using a formula: (Base Units + Time Units + Qualifying Circumstance Units) x Conversion Factor = Allowed Amount.

CPT Code 01925 carries 7.0 base units, confirmed in the VA Community Care Professional Anesthesia Nationwide Base Units Table. Cross-check this figure annually against the current ASA Relative Value Guide, as CMS may revise values with each fiscal year update. Use the FastRVU 2026 lookup tool to verify current reimbursement values for your locality.

Time unit calculation

CMS calculates time units in 15-minute increments. A 75-minute anesthesia case produces 5.0 time units (75 / 15 = 5). Some commercial payers round differently; confirm rounding methodology with each payer before submitting. Total anesthesia time runs from when the anesthesiologist assumes care through to when the patient is safely transferred to post-anesthesia recovery.

Practices relying on manual time-unit calculations frequently introduce arithmetic errors on complex cases like 01925. Automated billing workflows integrated with scheduling and procedure documentation can capture start and stop times directly, eliminating the manual conversion step.

CMS conversion factor

The CMS anesthesia conversion factor changes annually. For current national and locality-adjusted rates, use the CMS Physician Fee Schedule lookup tool. Always verify the conversion factor for the patient’s geographic locality, as values vary meaningfully between regions.

Medicaid rates are set state-by-state and are often lower than Medicare rates for the same code.

Physical status and CPT Code 01925 modifier requirements

Every anesthesia claim requires a physical status modifier. Missing or misassigned modifiers are the fastest route to a denial on 01925 claims. Patients undergoing carotid or coronary interventions typically present with significant comorbidities, making P3 or higher the most common assignment.

Physical status assignment is a clinical judgment made by the anesthesiologist. Coders should not assign or change a physical status modifier without documented provider determination. The clinical record must support the assigned modifier level.

A P3 assignment commonly reflects diagnoses like ICD-10 I25.10 or ICD-10 I10, both frequent findings in patients presenting for carotid or coronary intervention.

Provider role modifiers

Beyond physical status, CPT Code 01925 claims require provider-role modifiers that define the billing relationship between the anesthesiologist and any CRNA involved. Verify the correct modifier with each payer before submission, as coverage policies differ.

• Modifier AA: Anesthesia services personally performed by anesthesiologist
• Modifier QZ: CRNA service without medical direction by a physician
• Modifier QX: CRNA service with medical direction by a physician
• Modifier QY: Medical direction of one CRNA by an anesthesiologist
• Modifier 23: Unusual anesthesia (for cases requiring general anesthesia when local or no anesthesia is normally used)

Modifier 23 on CPT Code 01925 is less common but may be appropriate when the patient’s clinical condition or behavior necessitates a higher level of anesthesia than the procedure would typically require. Document the clinical rationale thoroughly, as payers frequently request records to support this modifier. Sound compliance management tools flag these high-scrutiny modifier combinations for pre-submission review.

Qualifying circumstance codes used alongside CPT 01925

Qualifying circumstance codes add units to the anesthesia formula when documented clinical conditions increase anesthetic complexity. They are reported in addition to 01925, not in place of it.

• 99100 (Anesthesia for patient of extreme age, younger than 1 year or older than 70): Commonly appended to 01925 for elderly cardiac patients. A patient aged 87 undergoing coronary angioplasty, for example, would typically carry both a P3 or P4 modifier and qualifying circumstance code 99100. Document the patient’s age clearly in the anesthesia record to support this code.
• 99140 (Anesthesia complicated by emergency conditions): Applicable when the procedure is performed on an emergency basis, creating additional anesthetic risk. The clinical record must define the nature of the emergency.

Verify qualifying circumstance code acceptance with each payer before submission. Some commercial plans bundle these into their base reimbursement rate and will not pay them separately.

Accurate ICD-10 diagnosis codes supporting the patient’s underlying condition are essential documentation for qualifying circumstance justification. For thorough qualifying circumstance documentation across your procedure portfolio, establish a standard pre-billing checklist for each anesthesia case type.

CPT Code 01925 documentation requirements

Incomplete documentation is the second most common denial reason for 01925 claims, behind modifier errors. The anesthesia record must capture specific data points to survive payer review or audit.

• Pre-anesthesia evaluation: Documented assessment of patient’s physical status, relevant comorbidities, airway classification, and anesthetic plan
• Anesthesia start and stop times: Precise timestamps supporting time-unit calculation; must align with the anesthesia record and the operative report
• Intraoperative monitoring notes: Continuous vital signs, anesthetic agents administered, dosages, and provider presence throughout the procedure
• Post-anesthesia assessment: Documentation of patient condition at handoff to recovery; supports medical necessity for the anesthesia level provided
• Procedure confirmation: Clear identification that the procedure performed was therapeutic (not diagnostic) and involved the carotid or coronary arterial system
• Provider credentials: Whether services were delivered by an anesthesiologist, CRNA, or a supervised team arrangement, with signatures supporting the billed modifier

Practices using digital anesthesia documentation tools can enforce required fields at the point of care, reducing retrospective documentation corrections before claim submission. Structured templates aligned to CPT coding documentation requirements help ensure each required data element is captured consistently.

Practices comparing medical billing software options should weigh point-of-care documentation enforcement alongside claims and modifier validation. For cross-referencing required documentation elements, the ResDAC coding resources library provides coding and claims documentation guidance aligned to CMS requirements.

CPT Code 01925 and related codes: selecting the right anesthesia code

The 01916-01942 range covers anesthesia for a variety of radiological procedures. Selecting the wrong code within this cluster is a common error because the descriptors differ by arterial territory and procedure intent.

01925 vs. 01924: CPT 01924 is the “not otherwise specified” catch-all for arterial therapeutic interventions. Use 01925 only when the procedure specifically targets the carotid or coronary arteries. Procedures on peripheral or visceral arteries outside this territory revert to 01924.

01925 vs. 01926: If the interventional procedure involves the intracranial, intracardiac, or aortic territory, 01926 applies instead. At 8.0 base units, 01926 reflects the higher anesthetic complexity of those cases. Coding the wrong code costs the practice 1.0 base unit of reimbursement per case.

Thorough review of the operative report, especially the procedure territory, is the key disambiguation step. The same logic applies to diagnostic code cross-referencing: let the documented clinical site drive code selection, not assumption. The AAPC Codify CPT lookup provides cross-references and instructional notes that clarify hierarchy within this code cluster.

Modifier and time-unit logic carries over to other anesthesia codes. CPT 99100 covers the extreme-age qualifying circumstance add-on discussed above, CPT 00702 applies to anesthesia for percutaneous liver biopsy, and CPT 00880 applies to anesthesia for major lower abdominal vessel procedures.

The same base-unit structure shows up in guides for CPT 00914, CPT 00600, CPT 01320, and CPT 00540, along with CPT 31579 for a procedure outside the anesthesia code range.

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Reimbursement and payer policy considerations for CPT 01925

Reimbursement for CPT Code 01925 is never a fixed dollar amount, and it depends on the same revenue cycle management fundamentals that apply across anesthesia billing.

• The CMS conversion factor for the reporting year
• The patient’s geographic locality
• The number of time units accrued
• Any qualifying circumstance additions

Always query current rates through the CMS fee schedule rather than relying on historical benchmarks.

Medicare coverage policy

Medicare covers anesthesia for therapeutic carotid and coronary interventions when medical necessity is documented and the procedure is covered under Medicare’s hospital or outpatient benefit.

Both general anesthesia and MAC are potentially payable, but MAC coverage for specific interventional radiology procedures may require additional documentation demonstrating why monitored care was selected over local anesthesia. Verify with the applicable Medicare Administrative Contractor for the practice’s jurisdiction.

Commercial payer variation

Commercial payers may apply prior authorization requirements to interventional radiology cases, which can indirectly affect the anesthesia claim if the primary procedure authorization is incomplete. Confirm that the authorization covers anesthesia services separately when required. Some payers attach local coverage determinations (LCDs) to carotid stenting procedures, affecting both the surgical and anesthesia billing.

Anesthesia practices handling high-complexity interventional cases benefit from having anesthesia billing for cardiac procedures systematically linked to prior authorization tracking in their workflow. The CPT coding documentation requirements framework that governs anesthesia claims applies equally whether the payer is Medicare, Medicaid, or commercial.

CRNA and supervision billing distinctions

CRNA billing rules for CPT Code 01925 are governed by CMS and state law. When a CRNA performs anesthesia independently without physician direction, modifier QZ applies and the CRNA bills under their own NPI. When medically directed by an anesthesiologist, modifiers QX (CRNA) and QY (anesthesiologist) are reported separately by each provider.

Incorrect supervision modifier assignment is heavily audited by CMS. Avoid blanket statements or assumptions. Verify the applicable supervision model with your compliance team and confirm payer-specific requirements. The practice management software your group uses should enforce provider-role modifier selection at the claim level.

Conclusion

CPT Code 01925 is a high-complexity anesthesia code with material reimbursement at stake per case. The most common failure points: missing or misassigned physical status modifiers, unsupported qualifying circumstance codes, and incorrect code selection within the 01924-01926 cluster.

Pabau’s claims management software gives interventional radiology billing teams a structured workflow for anesthesia claims: time-unit capture tied to scheduling, modifier validation at claim creation, and documentation completeness checks before submission. To see how it handles high-complexity anesthesia billing, book a demo.

Continue your research

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