CPT Code 00560: Anesthesia for intrathoracic procedures

Key Takeaways

CPT Code 00560 covers anesthesia for procedures on the heart, pericardial sac, and great vessels of the chest, specifically WITHOUT a pump oxygenator

Base unit value is 15; reimbursement follows the formula: (base units + time units) x anesthesia conversion factor

Using modifier AA vs. QZ is a leading source of claim denials – the distinction depends on whether an anesthesiologist personally performed or a CRNA acted without direction

Pabau’s claims management software helps anesthesia billing teams track modifiers, flag missing documentation, and reduce denial rates across intrathoracic cases

CPT Code 00560 is the anesthesia code for procedures on the heart, pericardial sac, and great vessels of the chest performed without a pump oxygenator (cardiopulmonary bypass). It carries 15 base units under the ASA Relative Value Guide.

The single clinical factor that separates it from adjacent code 00561 is whether cardiopulmonary bypass was used during the case, and billing workflow automation can catch that kind of coding error before a claim goes out.

This reference guide covers the official descriptor, ASA base units, the anesthesia reimbursement formula, applicable modifiers, Medicare coverage rules, documentation requirements, and the most common billing errors practices encounter with this code.

CPT Code 00560: Definition and clinical scope

CPT Code 00560 is the designated anesthesia code for procedures performed on the heart, pericardial sac, and great vessels of the chest when cardiopulmonary bypass (pump oxygenator) is not used. The official American Medical Association (AMA) descriptor reads: Anesthesia for procedures on heart, pericardial sac, and great vessels of chest; without pump oxygenator.

The “without pump oxygenator” qualifier is the single most important clinical detail for accurate coding. It distinguishes 00560 from CPT 00561, which applies when cardiopulmonary bypass is employed in patients under age 1. Other codes in this same intrathoracic range, such as CPT 00474 for rib resection, follow the same anatomical-region logic. Coders should confirm pump oxygenator status directly from the operative note before assigning 00560 or 00561.

Clinical procedures covered by CPT Code 00560

CPT Code 00560 applies across a range of cardiac and thoracic interventions where anesthesia is required but the heart-lung bypass machine is not activated. Common clinical scenarios include:

• Pericardiocentesis (drainage of the pericardial sac)
• Cardiac catheterization procedures without cardiopulmonary bypass
• Procedures on the thoracic aorta and major branches without bypass
• Minimally invasive cardiac procedures not requiring pump support
• Pericardiotomy or pericardial window creation
• Selected great vessel repairs performed off-pump

Procedures requiring cardiopulmonary bypass instead fall under CPT 00561 or 00562, not 00560, since those codes account for the added complexity of the pump oxygenator. The operative record must explicitly indicate that no pump oxygenator was used. Practices billing cardiac procedures can also benefit from cardiac surgery practice software that integrates procedure documentation with billing.

CPT Code 00560 anesthesia base units

The American Society of Anesthesiologists (ASA) assigns CPT Code 00560 a base unit value of 15. Base units represent the inherent complexity and risk of a given anesthesia service, independent of procedure duration.

Note that CPT Code 00560’s 15 base units reflect the higher complexity of cardiac anesthesia without bypass, compared to the 12 base units assigned to general intrathoracic procedures under 00540.

How reimbursement is calculated for CPT Code 00560

Anesthesia reimbursement does not follow the standard RVU-based physician fee schedule. Instead, Medicare and most commercial payers apply the anesthesia-specific formula:

Payment = (Base Units + Time Units) x Anesthesia Conversion Factor

Breaking down each component

• Base units: Fixed at 15 for CPT Code 00560 per the ASA Relative Value Guide
• Time units: Calculated as total anesthesia time divided by 15 minutes (each 15-minute increment = 1 time unit)
• Conversion factor: A locality-specific dollar amount set annually by CMS; varies by Medicare Administrative Contractor (MAC) region

Worked example

For a 90-minute procedure (6 time units) billed under CPT Code 00560 with a hypothetical conversion factor of $22.00:

(15 base units + 6 time units) x $22.00 = $462.00

Actual conversion factors vary by geographic locality and change each calendar year. Always verify the current figure using the CMS Physician Fee Schedule before submitting claims. The $22.00 figure above is illustrative only.

2026 Anesthesia fee schedule for CPT Code 00560

CMS updates the Medicare anesthesia conversion factor annually through the Medicare Physician Fee Schedule (MPFS) final rule, published each November in the Federal Register. For 2026, the national base anesthesia conversion factor ranges across MAC localities; individual state and county rates differ meaningfully.

Because conversion factors are locality-specific and subject to annual revision, billing teams should query the CMS fee schedule each fiscal year rather than relying on prior-year rates.

CPT Code 00560 modifiers

Anesthesia claims require a personnel modifier on every claim line. Selecting the wrong modifier is one of the most common denial causes for CPT Code 00560. The same personnel modifiers apply to other anesthesia codes, such as CPT 01850 and CPT 01400. The table below covers the applicable CMS-defined modifiers.

Modifier AA vs. QZ: The most common coding error

When an anesthesiologist personally administers anesthesia from induction through emergence with no CRNA involvement, modifier AA is correct. When a CRNA performs the case independently without any physician directing or medically directing the case, QZ applies.

The error occurs when practices submit AA on cases where the anesthesiologist was in a medically directing role across multiple concurrent rooms. That triggers a QK/QX split instead. Medicare audits regularly flag AA on cases where concurrent direction is evident in the operative schedule. Verify provider attendance documentation before selecting this modifier.

When to use modifier 53

Modifier 53 signals a discontinued procedure, but it belongs on the surgeon’s or proceduralist’s surgical or diagnostic procedure code, not on the time-based anesthesia code 00560. When a case stops after induction or incision, the anesthesia team bills 00560 for the actual anesthesia time delivered up to discontinuation.

Facility claims for the same discontinued case use modifier 73 or 74 instead of 53. The anesthesia record must still document the induction time, the point of discontinuation, and the clinical reason, since that documentation determines the time units billed.

Medicare and Medicaid coverage for CPT Code 00560

Medicare covers CPT Code 00560 when medically necessary anesthesia is required for a covered cardiac or thoracic procedure. CMS does not publish a specific National Coverage Determination (NCD) for this code. Coverage is instead governed by the clinical necessity of the underlying surgical procedure.

Practices should check applicable Local Coverage Determinations (LCDs) issued by their MAC for any regional policy nuances.

Key Medicare billing requirements for CPT Code 00560 include:

• The underlying surgical CPT code must be a covered Medicare service
• A valid ICD-10-CM diagnosis code supporting medical necessity must accompany the claim
• The anesthesia personnel modifier (AA, QK, QX, QZ, or QY) is mandatory on every claim line
• Anesthesia start and stop times must be documented in the anesthesia record
• Monitored anesthesia care (MAC) for a procedure normally coded 00560 still uses 00560, with modifier QS appended to show MAC rather than general anesthesia — there is no separate MAC-specific anesthesia code

Medicaid coverage varies by state and is not automatically equivalent to Medicare policy. Surgical specialties that bill high-base-unit anesthesia, from cardiac surgery to OB/GYN procedures, should verify each state’s Medicaid anesthesia policy independently rather than applying federal Medicare rules. Using a HIPAA-compliant billing system that separates Medicare and Medicaid claim workflows reduces cross-contamination of rules.

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Documentation requirements for CPT Code 00560

Inadequate documentation is the second leading cause of denied 00560 claims after modifier errors. The anesthesia record must support every element of the claim. Well-designed digital anesthesia record forms built into your practice workflow catch the most common missing elements before claims are submitted.

Required documentation elements include:

• Pre-anesthesia evaluation: Completed before surgery; documents patient history, physical status (ASA classification), planned anesthesia technique, and risk factors
• Intraoperative anesthesia record: Continuous time-stamped monitoring entries, all agents administered, start and stop times (essential for time unit calculation)
• Post-anesthesia care note: Recovery room status, vital signs, and discharge criteria
• Modifier justification: Documentation of provider role must match the modifier submitted (AA requires the MD to be continuously present and personally performing)
• ICD-10-CM diagnosis: Must directly support medical necessity for anesthesia under the specific cardiac or thoracic procedure performed
• Pump oxygenator status: Operative note must clearly state whether cardiopulmonary bypass was used; this is the definitive 00560 vs. 00561 selector

ICD-10 codes commonly paired with CPT Code 00560

Every 00560 claim requires a supporting ICD-10-CM diagnosis code. The diagnosis code reflects the patient’s condition requiring the cardiac or thoracic procedure, not the anesthesia service itself. I25.10 is one of the more frequently paired codes for cardiac catheterization cases.

This list is illustrative. Always assign the ICD-10-CM code that most accurately reflects the specific diagnosis documented in the patient record for that encounter. Use the AAPC Codify CPT lookup to verify ICD-10 crosswalks before claim submission.

CPT Code 00560 vs. CPT Code 00561: Key differences

The 00560/00561 distinction is the single most common coding error in intrathoracic anesthesia billing. The codes share an identical procedure site but differ on one critical clinical variable.

Practices should build a coding decision point into their anesthesia claim workflow: before submitting any intrathoracic anesthesia claim, require the coder to confirm pump oxygenator status directly from the operative report. Submitting CPT Code 00560 when a bypass pump was used constitutes upcoding, which carries OIG audit risk.

Common billing errors and how to avoid them

Most 00560 denials trace back to four preventable errors. Each one has a clear fix that practices can build into their pre-submission workflow. Anesthesia claims management software that flags these missing elements before submission can significantly reduce rework.

Error 1: 00560/00561 code swap

Submitting 00560 when cardiopulmonary bypass was used (and 00561 or 00562 applies) is the most audited error in intrathoracic anesthesia billing. Fix: require coder sign-off on pump oxygenator status from the operative report on every cardiac anesthesia claim before the claim line is finalized.

Error 2: Missing anesthesia start/stop times

Without documented start and stop times, payers cannot verify time unit calculations. This triggers either automatic denial or manual review delay. Fix: use timestamped digital anesthesia record forms that capture both the exact induction time and emergence time in the EHR.

Error 3: Wrong personnel modifier

Submitting AA on cases where the anesthesiologist was medically directing concurrent rooms (QK scenario) generates a payer edit on virtually every MAC. Fix: cross-check the OR schedule against the submitted claim to confirm single-case attendance for every AA-billed claim.

Error 4: ICD-10 diagnosis mismatch

Using a cardiac diagnosis code that doesn’t match the documented clinical scenario, or using a non-specific code (e.g., I51.9 “heart disease, unspecified”) when a more specific code is clearly documented, invites medical necessity denials. Fix: implement a pre-submit claim scrubber that flags non-specific diagnosis codes when a more specific option exists in the record.

Related anesthesia CPT codes

CPT Code 00560 sits within the intrathoracic anesthesia section. The adjacent codes cover the same anatomical region with different clinical parameters. For pacemaker and defibrillator insertion under anesthesia, see CPT 00534. See additional procedure code reference guides for international coding context.

Conclusion

CPT Code 00560 carries 15 base units and applies when anesthesia is provided for cardiac, pericardial, or great vessel procedures without a pump oxygenator. The pump oxygenator distinction, correct modifier selection, and complete time documentation are the three variables that determine whether a claim pays cleanly or enters denial review.

Pabau’s claims management software helps anesthesia and surgical practices build coding decision checkpoints into their billing workflow, so modifier errors and missing documentation get caught before submission. To see how it works for intrathoracic and cardiac cases, book a demo.

Continue your research

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Billing anesthesia for an orthopedic leg procedure? CPT 01260 uses the same personnel modifier structure as 00560.

Coding anesthesia for a knee disarticulation? CPT 01404 follows the same base-unit and time-unit reimbursement formula.

Frequently asked questions