CPT® Code 75571

Quick Reference: CPT 75571 (CT Heart Calcium Scoring)

• What it is: CPT 75571 is a non-contrast cardiac CT with a quantitative coronary calcium score (commonly reported as an Agatston score). It is intended for a dedicated calcium-scoring study, not a contrast angiographic evaluation. Use 75571 once per study (it includes all coronary vessels assessed in that acquisition).
• When it is (and is not) separately billable: If calcium scoring is performed as part of a coronary CT angiography (CCTA) session, do not report 75571 separately; calcium scoring is considered included in the CTA service for coding/payment purposes in typical payer policy frameworks.
• Medicare coverage reality: Many Medicare policies treat stand-alone quantitative calcium scoring as a screening service when performed without signs, symptoms, or disease, and therefore deny it as not reasonable and necessary. Coverage (when allowed) is driven by the MAC's LCD and payable ICD-10 list.
• Documentation essentials: Keep a clear ordering indication from the treating clinician, confirm no contrast was used, describe CT technique (ECG gating when applicable), and include the quantitative score with interpretation and risk context. Medicare diagnostic test ordering rules (treating practitioner order/management intent) are commonly cited in related coverage guidance.
• PC/TC billing: Report 26 for professional interpretation only, TC for technical component only, and no modifier for global billing when one entity provides both components. Practical modifier conventions are summarized in common coding guides.
• Modifiers that matter in edge cases: Use 59 only when 75571 truly represents a distinct service from another code on the same date under applicable edit rules (not to bypass disallowed unbundling with CCTA). Use 76 when the same provider repeats the study on the same date (rare).
• ECG gating rule: Do not bill separate ECG tracing/monitoring codes solely for CT gating/monitoring with 75571-75574; CMS NCCI guidance for radiology addresses this bundling concept for cardiac CT services.

CPT 75571 is the core code used to report a dedicated coronary artery calcium (CAC) score study: a non-contrast CT of the heart that produces a quantitative measurement of coronary calcified plaque. Calcium scoring is clinically valuable because calcification correlates with atherosclerotic plaque burden and can refine cardiovascular risk assessment. However, from a coding standpoint, 75571 sits at the intersection of radiology component billing, Medicare coverage limitations around screening, and bundling rules that treat calcium scoring as included when performed with contrast coronary CT angiography.

This guide explains how to code 75571 correctly in 2026 with a focus on: (1) recognizing when the service is truly "stand-alone," (2) documenting the study so it is auditable, (3) selecting ICD-10 codes that support medical necessity when coverage is possible, (4) applying professional/technical modifiers appropriately, and (5) avoiding common denials -- especially claims denied as screening or as bundled into coronary CTA.

1. CPT 75571 Definition & What the Code Represents

CPT 75571 describes: Computed tomography, heart, without contrast material, with quantitative evaluation of coronary calcium. In workflow terms, the imaging team acquires a non-contrast CT dataset of the heart (often ECG-gated), then performs post-processing that yields a quantitative calcium score -- commonly an Agatston score and sometimes additional metrics such as volume or mass score, depending on the reporting standard used by the interpreting physician.

Two boundaries define 75571 coding correctness. First, the study is without contrast; the code is not intended to represent contrast-enhanced angiographic evaluation. Second, the study includes a quantitative evaluation -- meaning the work product is not merely "calcification present," but a numeric score with interpretive context.

The most frequent coding error is reporting 75571 when the patient undergoes a coronary CT angiogram (CCTA) in the same session. Coding guidance aimed at distinguishing CT codes emphasizes that stand-alone calcium scoring is reported with 75571, while contrast coronary CTA codes (75574 and related codes) include the calcium scoring work when performed in conjunction with the angiogram. In parallel, Medicare coverage guidance for cardiac CT services often states that quantitative calcium scoring in isolation is considered screening and, when performed alongside CTA, is not separately reimbursed.

A practical rule: One session, one heart CT family code. If the clinical purpose is angiographic evaluation (contrast CCTA), report the CTA code and do not add 75571 for the calcium score derived from the same visit. If the clinical purpose is dedicated risk stratification via CAC only, and no contrast coronary CT is performed, 75571 is the appropriate code.

2. Appropriate Clinical Use of Coronary Calcium Scoring

Calcium scoring is primarily a risk stratification tool. It helps clinicians refine the probability that a patient has clinically meaningful coronary atherosclerosis and can guide preventive therapy decisions (for example, the intensity of lipid-lowering therapy or the urgency of further evaluation). While clinical guidelines evolve, payers often translate "appropriate use" into a narrower set of coverage rules -- especially Medicare, which is sensitive to whether a test is performed to diagnose/manage a condition versus performed as preventive screening.

Common appropriate clinical contexts

• Intermediate or uncertain risk assessment: A patient whose risk estimate is not clearly low or high may benefit from CAC to refine risk, particularly when management decisions are borderline (e.g., whether to initiate or intensify statins).
• Selected symptomatic patients: While many symptomatic patients proceed directly to functional testing or CCTA, a stand-alone CAC can sometimes be used in an evaluation pathway when it meaningfully changes next steps. In payer terms, the presence of symptoms may also shift the service away from "screening" and toward "diagnostic," which can matter for coverage.
• Follow-up framing (not routine re-testing): Calcium burden changes slowly. Repeating CAC too frequently can raise medical-necessity concerns unless a payer policy explicitly supports the interval and the clinical rationale is documented.

Contexts that frequently trigger denials

• Routine screening in asymptomatic, low-risk patients: Medicare policies commonly describe stand-alone calcium scoring as screening when performed without signs, symptoms, or disease, leading to denial as not reasonable and necessary.
• Calcium scoring "added on" to coronary CTA: When CAC is performed before or during CCTA to help plan or interpret the CTA, it is generally treated as included in the CCTA service for coding and payment, and 75571 should not be separately reported.

In other words, "appropriate clinical use" is not identical to "covered use." Even when a clinician believes CAC is valuable, Medicare may still classify it as screening unless the patient's documentation clearly reflects signs, symptoms, or disease and the service fits within the MAC's covered indications list.

3. Documentation Requirements That Support Payment

For 75571, documentation must establish three things: (1) the service performed matches the code definition, (2) the ordering and use of the test meet diagnostic test rules, and (3) the clinical indication supports medical necessity when coverage is sought.

Ordering and medical necessity foundation

Medicare coverage materials for cardiac CT commonly reference the principle that diagnostic tests must be ordered by the treating practitioner who is managing the patient and intends to use the results in care (a concept frequently linked to 42 CFR 410.32 in LCD discussions). Operationally, this means your record should show:

• Who ordered it and that the ordering clinician is treating/managing the patient;
• Why it was ordered (specific indication, symptoms, prior testing ambiguity, or risk assessment decision point);
• How it will be used (e.g., risk stratification to guide preventive therapy or to determine need for further diagnostic testing).

Radiology report essentials

• Technique: Explicitly document non-contrast acquisition and the method used (ECG gating when applicable). If heart rate control medications were used, include them as part of the protocol narrative if your practice standard includes that.
• Quantitative result: Provide the total calcium score and, when your reporting template supports it, vessel-level scoring. The claim is stronger when the report demonstrates the "quantitative evaluation" portion of the CPT definition.
• Interpretation: Translate the numeric score into clinically meaningful categories (e.g., none/minimal/mild/moderate/severe or percentile ranking by age/sex where available). A payer audit is less likely to question medical necessity when the report clearly conveys diagnostic relevance rather than describing the study as "screening."
• Incidental findings and limitations: Document significant incidental findings (e.g., coronary anomalies, aortic calcification, lung findings seen in the field of view) and limitations such as motion artifact. This demonstrates the professional work performed.

ECG gating and separate ECG billing

Do not bill separate ECG codes solely for gating/monitoring associated with cardiac CT. CMS NCCI radiology guidance addresses that ECG services used for cardiac CT gating should not be separately reported with cardiac CT codes 75571-75574. A helpful internal compliance step is to configure charge capture so that gating-related ECG items are not automatically posted as separate billable ECG procedures for CAC studies.

4. Global vs. Technical/Professional Billing (26/TC)

CPT 75571 follows standard imaging component billing rules. The code may be billed as a global service (technical + professional) or split into professional and technical components depending on the billing entity.

Ensure your charge capture prevents duplicate component billing (e.g., two entities billing global, or facility billing 26). Duplicate component errors commonly lead to denials or recoupments.

If multiple imaging studies occur on the same date (for example a chest CT for another indication plus CAC), payers may apply multiple-procedure reductions to certain technical components. That is a payment policy issue rather than a coding rule; the coding priority remains to report the correct service(s) that were actually performed and medically necessary.

5. Modifier Guidance (59, 76, GA, GY)

Beyond 26/TC, the modifiers most relevant to CAC claims are 59 (distinct procedural service), 76 (repeat procedure by same physician), and (for Medicare non-coverage situations) GA/GY workflows. Modifier choice should reflect real clinical circumstances and must not be used to "force" payment when policy prohibits separate reporting.

Modifier 59 (Distinct Procedural Service)

CMS MAC guidance on modifier 59 emphasizes that it is used to indicate a distinct service, often in the context of CCI edits, only when appropriate criteria are met. For 75571, legitimate use cases are narrow:

• Different session: 75571 is performed in a separate encounter on the same date from another service that would otherwise trigger a bundling edit (and documentation clearly supports separate sessions).
• Different clinical purpose: 75571 is clearly separate from another imaging service with a different purpose and not part of the same procedural package.

Do not use 59 to unbundle 75571 from coronary CTA performed in the same session. Coding guidance that differentiates CT heart codes states that coronary CTA codes include calcium scoring when performed, and payer policy frameworks commonly treat the CAC as included in CCTA. In that situation, the correct solution is correct coding (report CTA, not both), not modifier override.

Modifier 76 (Repeat Procedure by Same Physician)

Modifier 76 is used when the same procedure is repeated on the same day by the same physician/provider. For CAC, same-day repeats are uncommon but can occur due to motion artifact, acquisition failure, or a technical interruption that required re-scanning to obtain a diagnostic-quality dataset.

If a repeat is performed, document:

• why the first attempt was nondiagnostic (e.g., motion artifact, equipment interruption),
• that the repeat was necessary to obtain diagnostic images, and
• that the repeat involved a new acquisition, not simply reprocessing the same dataset.

GA and GY for expected Medicare non-coverage

When a Medicare beneficiary receives a calcium score as a patient-requested screening service (or otherwise outside coverage criteria), practices often use an ABN process so the patient understands financial responsibility if Medicare denies. Coding forum discussions commonly reference the practical use of ABN-related modifiers (such as GA when a waiver of liability is on file) and GY when the service is statutorily excluded/not covered, consistent with how many billing offices operationalize expected denials.

Your internal policy should define when ABNs are required, how they are stored, and how claims are submitted when denial is expected. The compliance goal is not "to get paid anyway," but to ensure the patient is properly informed and that claim processing assigns liability correctly.

6. ICD-10 Pairing & Medical Necessity Strategy

For 75571, ICD-10 selection is often the decisive factor in whether a claim is paid or denied. A calcium score can be clinically useful in asymptomatic risk stratification, but Medicare may classify that use as screening. When coverage is possible, it is typically supported by documented symptoms, abnormal prior testing, or established cardiovascular disease contexts that appear on a MAC's payable diagnosis list.

ICD-10 categories that often support medical necessity (when clinically accurate)

• Chest pain and angina spectrum: Codes such as angina or chest pain may support diagnostic intent when a patient has symptoms. Many MAC billing articles list common ischemic heart disease and symptom codes as supportive of medical necessity for cardiac CT services.
• Known coronary disease or atherosclerosis-related diagnoses: When CAC is used in a patient with established CAD-related conditions, documentation must explain why a calcium score (rather than CTA or functional testing) was appropriate for the clinical question.
• Abnormal prior cardiac testing: An abnormal ECG or other abnormal cardiovascular study can support further risk assessment in some payment frameworks, and relevant codes appear in MAC articles addressing cardiac CT services.

Codes that commonly trigger screening denials

For Medicare, screening-oriented Z-codes (for example, general cardiovascular screening) predictably deny as screening/non-covered in many jurisdictions. If the patient's service is truly screening and you are pursuing patient-pay, that denial may be expected; the key is to manage liability appropriately (e.g., ABN and correct modifier workflow) rather than attempting to "relabel" the indication.

For payer audits, the best defense is consistency: the order, clinical note, and diagnosis code should all describe the same story. If the chart says "patient-requested screening" but the claim uses a symptom code, that mismatch can become an overpayment risk even if the claim is initially paid.

7. Payer Coverage Considerations (Medicare & Commercial)

Coverage behavior differs substantially between Medicare and commercial insurance. Most billing friction for 75571 comes from Medicare's tendency to treat stand-alone CAC as screening absent signs, symptoms, or disease, and from bundling rules when CAC is obtained alongside CCTA.

Medicare

Medicare coverage is governed primarily by MAC LCDs and associated billing articles. LCD language for cardiac CT services can state that stand-alone quantitative calcium scoring is not covered (screening) and that calcium scoring performed with coronary CTA has no separate reimbursement. For coding teams, this translates into two operational checks before billing:

• Was it stand-alone? If performed with CCTA, do not bill 75571 separately; bill the CCTA code per applicable guidance.
• Is the diagnosis payable in your jurisdiction? Use the MAC billing article's payable ICD-10 list for cardiac CT services when seeking coverage.

If you expect denial because the service is screening, manage it as patient-pay with a documented financial notice process. Many practices operationalize this with ABN workflows and the GA/GY modifier conventions described in coder discussions.

Commercial insurance

Commercial payers vary. Some cover CAC in defined risk-stratification scenarios, while others treat it as non-covered preventive screening or require specific medical-policy criteria. Even when covered, commercial plans may impose frequency limits (e.g., not more often than every few years). Because CAC is relatively low cost and often offered as self-pay, some practices choose not to submit claims when coverage is unlikely, depending on contractual obligations and plan requirements.

When billing commercial plans, make sure:

• the service is clearly stand-alone (or billed correctly as part of CCTA when combined),
• the ICD-10 code matches the plan's policy language, and
• the report demonstrates quantitative scoring, not merely qualitative commentary.

8. Real-World Coding Scenarios

Scenario 1: Stand-alone CAC in hospital outpatient with symptoms

Clinical story: Patient presents with atypical chest pain. Treating clinician orders a dedicated CAC CT without contrast to refine CAD risk and determine whether to proceed to further testing.

Correct coding: Facility bills 75571-TC; interpreting physician bills 75571-26.

Why it gets paid (when it does): The chart reflects diagnostic intent and the diagnosis is consistent with payable indications listed in MAC billing guidance for cardiac CT services.

Scenario 2: Patient-requested screening CAC (Medicare) with ABN

Clinical story: Asymptomatic patient requests CAC for reassurance. No signs or symptoms are documented, and the service is preventive screening.

Correct billing approach: Obtain ABN before service; submit claim anticipating denial and manage patient liability appropriately. Many billing teams apply modifier workflows commonly discussed in coding communities for non-covered CAC services.

Key risk control: Ensure documentation is consistent: if it is screening, do not code symptoms that are not present.

Scenario 3: CAC performed prior to coronary CTA in the same session

Clinical story: Patient undergoes CCTA for chest pain; the facility performs a preliminary CAC acquisition for planning/interpretation.

Correct coding: Bill the coronary CTA code only; do not add 75571 in the same encounter.

Authority basis: Coding guidance differentiating CT heart codes explains that CTA codes include CAC when performed, and Medicare LCD language commonly states there is no separate reimbursement for calcium scoring performed with CTA.

Scenario 4: CAC with unrelated imaging on the same date (possible 59)

Clinical story: Patient receives a non-cardiac CT for another indication and returns later the same day for a separate scheduled CAC study in a different session.

Correct coding consideration: If the payer edits bundle and documentation supports separate sessions, 59 may be appended to 75571 to indicate a distinct procedural service, consistent with MAC guidance describing appropriate 59 use.

Guardrail: Use 59 only when criteria are met; it is not a "payment modifier."

Scenario 5: Repeat CAC on the same date due to motion artifact (rare 76)

Clinical story: First acquisition is nondiagnostic due to motion; a second acquisition is performed after patient coaching.

Correct coding: Report 75571 for the completed diagnostic service; if billing both acquisitions, append 76 to the repeat by the same provider, and document why the repeat was necessary.

Payment reality: Some payers may not reimburse both; correct documentation is essential regardless.

High-frequency denial triggers to audit internally

• 75571 billed on the same date as coronary CTA (should typically be CTA-only)
• Screening indications billed as diagnostic (record/claim mismatch)
• Separate ECG codes billed only for CT gating/monitoring
• Missing quantitative score in the report (fails the "quantitative evaluation" expectation)