CPT 01922: Non-invasive imaging anesthesia and radiation therapy

Key Takeaways

CPT Code 01922 describes anesthesia for non-invasive imaging or radiation therapy, including MRI, CT, PET scans, X-rays, and stereotactic radiation sessions.

Base unit value is 7; total reimbursement equals (base units + time units) multiplied by the Medicare anesthesia conversion factor, which varies by geographic location.

Modifier selection is the most common billing error: use AA for physician-only care, QZ for unsupervised CRNA, QX/QY/QK for medically directed scenarios.

Practice management software like Pabau helps cut down on these errors with digital forms that capture documentation at the point of care, plus claims management tools that automate submission, validation, and tracking.

CPT Code 01922 describes anesthesia services provided during a non-invasive imaging procedure or a radiation therapy session, such as MRI, CT, PET, or stereotactic radiosurgery. The code applies to the anesthesia encounter itself, not the imaging or radiation procedure performed alongside it.

The American Medical Association (AMA) maintains the CPT code set, and CPT Code 01922 sits within the Anesthesia for Radiological Procedures subsection.

The official long description reads: Anesthesia for non-invasive imaging or radiation therapy. The short description used on most claim forms is: Anes non-invasive imaging/radiation therapy.

The code covers any session where a provider delivers anesthesia services to support a patient undergoing a non-invasive imaging procedure or a radiation therapy treatment. Neither the imaging modality nor the radiation approach needs to be specified on the claim; the code applies to the anesthesia encounter itself.

Procedures covered under CPT 01922

CPT Code 01922 applies when a provider administers anesthesia services during non-invasive imaging or radiation therapy sessions. “Non-invasive” is the operative word: the code does not cover anesthesia for image-guided interventional procedures such as needle biopsies, drain placements, or intravascular catheter work.

The most common clinical applications covered by this code include the following procedure types.

• Magnetic resonance imaging (MRI): Pediatric patients, claustrophobic adults, and patients with movement disorders often require sedation or general anesthesia to complete MRI sessions. This is the highest-volume use case for CPT 01922 in most practices.
• CT scanning: CT anesthesia cases are less common than MRI but arise in pediatric patients or individuals who cannot cooperate with breath-holding instructions.
• PET scanning: Prolonged positioning and the requirement to remain still during radiotracer distribution make PET scans a common indication for anesthesia support.
• X-ray and fluoroscopy (non-invasive): Diagnostic fluoroscopy without catheter placement or contrast injection falls within the scope of this code.
• Stereotactic radiation therapy: Framed stereotactic radiosurgery and SBRT (stereotactic body radiation therapy) sessions require precise patient immobility, which anesthesia supports.
• Standard external beam radiation therapy: Radiation therapy sessions for pediatric patients or adults with significant anxiety or pain conditions routinely use anesthesia for radiation therapy billed under CPT 01922.

What this code does not cover: Anesthesia for invasive imaging procedures (e.g., arthrography with injection, myelography, or intravascular contrast studies) uses different anesthesia codes. Verify the procedure type with the proceduralist before assigning 01922.

Base units for CPT Code 01922

Anesthesia reimbursement follows a base unit plus time unit formula that differs from the RVU-based model used for surgical and evaluation and management codes. For CPT Code 01922, the base unit value is 7, confirmed by the American Society of Anesthesiologists (ASA) Relative Value Guide and consistent across CMS fee schedule data.

The calculation works as follows:

For a 45-minute MRI anesthesia session: base units (7) plus time units (3, representing three 15-minute intervals) equals 10 total units before conversion factor. Apply the relevant Medicare conversion factor for your locality to reach the payment amount.

Use the FastRVU 2026 lookup tool to pull current geographic conversion factor data, then cross-check it against Medicare’s own fee schedule for your locality.

Modifiers for CPT Code 01922

Modifier selection drives more anesthesia claim denials than any other single coding decision. The modifier communicates the care delivery model to the payer: who provided the anesthesia, and in what supervisory arrangement.

Missing or incorrect modifiers on CPT Code 01922 are the fastest path to a preventable denial. The AAPC Codify CPT lookup provides a reference list of valid anesthesia modifiers.

Medicare pays at 50% of the AA rate when modifier QK or QY applies. Confirm current payer-specific rules with each commercial carrier, as contractual rates differ from Medicare’s published schedule.

Qualifying circumstances for CPT 01922

Qualifying circumstances (QC) are add-on codes that reflect increased complexity of anesthesia services. They may be reported alongside CPT Code 01922 when the specified clinical condition is present and documented. Payer acceptance of qualifying circumstance codes varies; verify policy before billing.

Code 99100 is the most commonly applicable QC code for CPT 01922, particularly in pediatric MRI and radiation therapy cases. Document the patient’s age explicitly in the anesthesia record; payers will request this to support the additional units.

CPT Code 01922 reimbursement and Medicare fee schedule

Medicare reimbursement for CPT Code 01922 follows the anesthesia payment formula rather than the standard RBRVS system. The Centers for Medicare and Medicaid Services (CMS) sets a national anesthesia conversion factor, adjusted by the Geographic Practice Cost Index (GPCI) for each locality.

That means a 45-minute MRI anesthesia case billed in Manhattan is reimbursed differently than the same case in rural Mississippi.

The formula is: Total units x (Anesthesia CF x GPCI) = Medicare allowable amount. For the most current conversion factor and locality-specific multipliers, always consult the CMS Physician Fee Schedule rather than relying on prior-year figures. Conversion factors change annually and mid-year corrections do occur.

Key reimbursement facts for CPT Code 01922:

• Medicare pays 100% of the AA rate when the anesthesiologist personally performs the procedure (modifier AA).
• Medically directed cases (modifiers QK, QY) are reimbursed at 50% of the AA rate for both the physician and the CRNA claim lines combined.
• MAC cases with modifier QS may have separate payer-specific reimbursement tiers; verify by carrier.
• Commercial payer rates are negotiated separately and may exceed Medicare allowables substantially, particularly in metropolitan markets.

ICD-10 codes commonly used with CPT 01922

Accurate diagnosis code pairing supports medical necessity on CPT Code 01922 claims. The ICD-10-CM codes most frequently submitted alongside this code reflect the underlying conditions driving the imaging or radiation therapy encounter, from behavioral indications like F84.0 to incidental findings coded as Z03.89.

Many of these diagnoses arrive as referrals: a GP practice flags a behavioral concern, or a mental health EMR already has anxiety or autism documented, and the imaging team needs that context on file to support the anesthesia claim.

Always code to the highest degree of specificity available in the medical record. Payers may request supporting clinical documentation for Z-codes or unspecified codes when billed with anesthesia services.

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Documentation requirements for CPT Code 01922

Insufficient documentation is the second most common reason CPT Code 01922 claims are denied or downgraded on audit. Anesthesia records must stand on their own; a vague proceduralist’s operative note does not substitute for a complete anesthesia record. Using digital anesthesia forms within your practice management platform reduces the risk of incomplete records reaching the billing queue.

Every CPT 01922 claim should be supported by documentation that covers these core elements.

• Anesthesia start and stop times: Record the exact anesthesia start (induction) and end (patient handoff to recovery) times in hours and minutes. These times directly determine time unit calculation. Rounding to the nearest 15 minutes is standard; document the exact times in the record and let the billing system calculate the units.
• ASA physical status classification: ASA PS I through VI must appear in the anesthesia record. This classification is not a billing modifier but supports medical necessity and audit defense.
• Anesthesia type and agents: Document whether general anesthesia, sedation, or MAC was used, along with the agents administered and doses. This establishes the clinical basis for the code and the modifier selected.
• Pre-anesthesia evaluation: A pre-procedure assessment note with patient history, airway assessment, and planned anesthetic approach is required by most payers and is a Medicare condition of payment.
• Intraoperative monitoring record: Continuous vital signs, oxygen saturation, end-tidal CO2 (if applicable), and any adverse events must be recorded at minimum 5-minute intervals.
• Post-anesthesia note: A brief note confirming the patient’s condition at handoff to recovery is a standard documentation requirement.

Practices using HIPAA-compliant practice software can automate time-stamped documentation entries, reducing the manual burden of building a complete anesthesia record.

Common billing mistakes to avoid with CPT 01922

Non-invasive imaging anesthesia billing produces a consistent set of errors across practices. Most are avoidable with the right documentation workflow and modifier review process.

• Wrong modifier for the care model: Billing modifier AA when a CRNA was providing unsupervised care (which should be QZ) is a compliance risk, not just a billing error. Confirm the care model before modifier selection on every claim.
• Missing anesthesia start and stop times: Without exact times, the time unit calculation cannot be verified. Payers will deny or reduce the claim. Build time-capture into the anesthesia record workflow rather than reconstructing it at billing.
• Unbundling with the proceduralist’s code: The anesthesiologist or CRNA bills CPT 01922 separately. Do not attempt to bundle the anesthesia service into the radiologist’s or radiation oncologist’s procedure code. These are separate providers billing separate claim lines.
• Reporting qualifying circumstances without clinical documentation: Add-on codes 99100, 99116, 99135, or 99140 require documented clinical criteria. Billing 99100 without documenting the patient’s age in the record creates an audit liability.
• Using incorrect base units: CPT 01922 has 7 base units. Entering a different base unit value, whether from memory or a stale fee schedule, directly affects payment and creates overpayment recovery risk on audit.
• Failing to verify NCCI edits: The CMS National Correct Coding Initiative (NCCI) publishes annual edit tables that define which code combinations may or may not be billed together. Verify CPT 01922 against current NCCI tables before submitting with any add-on codes.

Billing teams covering multiple specialties may also want to check Pabau’s newest coding guides, including A4427 and L2999.

Related CPT codes for anesthesia and imaging

When CPT Code 01922 does not match the procedure performed, the following related anesthesia codes are the most common alternatives. Selecting the correct code from this group requires knowing whether the imaging procedure was invasive, whether a catheter was placed, and the anatomical region involved.

Recent additions to the library include coaching CPT codes and a billing guide for G0180.

When the radiologist or radiation oncologist performs an invasive step (e.g., placing a catheter for image-guided injection), the anesthesia code shifts from 01922 to the appropriate interventional code. Coordinate with the proceduralist’s billing team to confirm whether any invasive element was performed.

How practice management software helps with anesthesia billing

Anesthesia billing errors are rarely random. They cluster around the same three steps: modifier selection at the time of service, time documentation during the procedure, and qualifying circumstance validation at claim submission. Each step requires the billing team to manually retrieve information that was created in the clinical workflow but never connected to the billing record.

Practice management software changes this by connecting clinical documentation to the billing process instead of leaving the two disconnected. Practice management software like Pabau captures anesthesia records, including start and stop times, agents used, and pre- and post-procedure notes, through digital forms completed at the point of care.

That information already sits in Pabau’s claims management software by the time a claim is prepared, rather than being reconstructed from a paper record hours or days later.

The practical result is fewer incomplete claims reaching the clearinghouse. Practice management software that connects clinical documentation to claims management reduces the manual review burden that drives billing team overhead in anesthesia practices.

Pabau’s claims management software also automates claim submission, validation, and tracking, and automated workflows handle routine reminders and routing tasks so billing staff spend less time chasing paperwork.

Documentation-to-claim continuity also matters for audit defense. When a payer requests supporting records for a CPT 01922 claim, a complete time-stamped anesthesia record generated within the practice management system is easier to produce and more defensible than reconstructed paper records, whether the diagnosis pairs with C71.9 or a general-symptom code like R68.89.

Conclusion

CPT Code 01922 is a straightforward code with a narrow failure window: the base units are fixed, the procedures it covers are well-defined, and the formula for calculating payment is consistent. The errors that generate denials come from modifier mismatches, incomplete time documentation, and qualifying circumstance codes without clinical backing.

Practice management software like Pabau connects anesthesia documentation to claims management, with digital forms that capture records at the point of care and claims tools that automate submission, validation, and tracking. To see how Pabau can support your anesthesia billing workflow, book a demo with the team.

Continue your research

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Looking for a reference on digital forms for clinical documentation? Medical forms at your healthcare practice walks through how digital intake and clinical forms replace paper-based anesthesia records.

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