CPT Code 01920

Key Takeaways

CPT Code 01920 covers anesthesia for radiological procedures on the heart and great vessels, billed by anesthesiologists and CRNAs.

Reimbursement uses the formula: (Base Units + Time Units) x Conversion Factor; the AMA assigns 7 base units to CPT 01920.

Physical status modifiers P1-P6 are mandatory; missing them is a leading cause of claim denials for this code.

Pabau’s claims management software helps anesthesia practices reduce denials by flagging missing modifiers and documentation gaps before submission.

CPT Code 01920: Definition and clinical scope

Anesthesia claims for cardiac radiological procedures are among the most denial-prone in the specialty. Missing a required modifier or miscalculating time units on a single case can cost a practice hundreds of dollars in rework or write-offs.

CPT Code 01920 covers anesthesia services for radiological procedures on the heart and great vessels. This includes cardiac catheterizations, interventional radiology procedures, and other imaging-guided cardiac interventions requiring anesthesia. The code is maintained by the American Medical Association (AMA), which assigns the base unit values used in reimbursement calculations.

Both physician anesthesiologists and Certified Registered Nurse Anesthetists (CRNAs) use CPT Code 01920, though billing distinctions between the two provider types require specific modifiers. This guide covers everything billers and anesthesia practices need to submit clean claims.

Base units for CPT Code 01920

The AMA assigns a fixed base unit value to every anesthesia code. For CPT Code 01920, the base unit value is 7 units. This figure reflects the relative complexity and risk of providing anesthesia for radiological cardiac procedures compared to other anesthesia services.

Base units differ across the anesthesia code range. The table below shows how CPT 01920 compares to adjacent codes that anesthesia billers commonly encounter.

Always verify the current base unit value with the AAPC CPT code reference or the AMA’s official relative value guide. Base units are not adjusted annually in the same way as conversion factors, but confirmation against the current year’s data is best practice. Practices using claims management software can embed the current base unit values directly into their billing templates to avoid manual entry errors.

How the anesthesia billing formula works for CPT Code 01920

Anesthesia billing uses a formula not found in any other CPT section. The standard calculation, confirmed by the CMS Physician Fee Schedule, is:

(Base Units + Time Units) x Conversion Factor = Billable Amount