CPT Code 77067: Billing guide for bilateral screening mammography

Key Takeaways

CPT Code 77067 describes bilateral screening mammography (two-view study of each breast) including computer-aided detection (CAD) when performed, for asymptomatic patients.

ICD-10-CM code Z12.31 is the standard diagnosis paired with 77067; using a symptomatic or diagnostic code on a screening claim triggers automatic denial.

CAD is bundled into 77067: separately billing add-on code 77052 is no longer appropriate and will result in a duplicate-service denial.

Pabau’s claims management software helps radiology and women’s health practices track modifier assignments, catch common 77067 billing errors, and streamline claim submission workflows.

CPT Code 77067 is the billing code for bilateral screening mammography — a two-view study of each breast, including computer-aided detection (CAD) when performed — for asymptomatic patients. It is the standard code for routine preventive breast cancer screening in the US and pairs with ICD-10-CM diagnosis code Z12.31.

This guide covers how to pair 77067 with the correct diagnosis codes and modifiers, what Medicare reimburses, how it differs from related mammography codes, and the billing errors that most often trigger denials.

CPT Code 77067: definition and clinical description

CPT Code 77067 is defined by the American Medical Association (AMA) as: Screening mammography, bilateral (2-view study of each breast), including computer-aided detection (CAD) when performed. It replaced the legacy HCPCS G-code G0202, which Medicare used through December 31, 2016. Practices using OB/GYN and women’s health workflows should note that OB/GYN and women’s health EMR platforms with integrated billing modules now reflect the 77067 standard, not the older G-code structure.

The code applies to asymptomatic patients only. Two views of each breast are required (typically craniocaudal and mediolateral oblique). CAD (computer-aided detection) is bundled in when used, meaning no separate CAD add-on code is appropriate alongside 77067.

Code specifics at a glance

ICD-10 diagnosis codes paired with 77067

The diagnosis code on a 77067 claim tells the payer whether the service is preventive or diagnostic. Getting this wrong is the most common single cause of screening mammography denials. As confirmed by Johns Hopkins Medicine breast imaging ordering guidance, the standard code for a routine screening mammogram is Z12.31 (Encounter for screening mammogram for malignant neoplasm of breast).

Supporting patient intake and medical forms that capture family history and risk factors help coders select the correct secondary diagnosis, which can support medical necessity for higher-risk patients without triggering a diagnostic reclassification.

Accepted ICD-10-CM codes for CPT Code 77067 claims

Never use a symptomatic ICD-10 code (such as N63.x for breast lump or R92.x for abnormal mammogram findings) as the primary diagnosis on a 77067 claim. Doing so reclassifies the service as diagnostic, which changes the patient’s cost-sharing under most plans and may trigger a medical necessity review.

Modifiers for CPT Code 77067

Modifier assignment on mammography claims depends on whether the facility owns the imaging equipment, whether the radiologist bills independently, and whether the exam was completed as ordered. Three modifiers apply most frequently to CPT Code 77067 claims.

Maintaining HIPAA-compliant documentation practices around modifier selection is important because payer audits frequently focus on whether the technical and professional components were billed correctly across different provider types in a shared facility setting.

• Modifier 26 (Professional Component): Appended when the radiologist bills only for interpretation of the mammogram. The facility bills separately for the technical component (equipment, technologist, film). Per CMS LCD L33950, a provider reviewing a mammogram as part of an E&M service may not separately bill Modifier 26 if the mammographer has already billed interpretation.
• Modifier TC (Technical Component): Appended by the facility billing for the equipment, staff, and supplies only, when the professional and technical components are billed separately. Not used in global billing scenarios.
• Modifier 52 (Reduced Services): Used when only one breast is imaged (unilateral), for example after a mastectomy. When 77067-52 is billed alongside 77063 (tomosynthesis add-on), it signals to the payer that a unilateral screening mammogram was performed with bilateral screening tomosynthesis. This combination requires careful documentation to avoid a rejection on the grounds that 77067 is a bilateral-only code.

Modifier decision tree

CPT 77067 vs 77063, 77065, and 77066

The mammography code family is one of the most commonly miscoded areas in radiology billing. The four codes used most often have overlapping terminology but distinct clinical and administrative criteria. Using the wrong code, even for the right procedure, creates denial cycles that can take weeks to resolve. Reviewing IVF and reproductive procedure codes alongside mammography codes is useful for women’s health billing teams managing multiple service lines in a single practice.

77063 is the key companion code for practices performing digital breast tomosynthesis (3D mammography). It is an add-on code billed in addition to 77067, never as a standalone. Per Noridian Medicare (Jurisdiction F Part B), 77063 must be billed in conjunction with the primary mammogram code for claims with dates of service on or after January 1, 2018.

77065 and 77066 are diagnostic codes. Billing either alongside Z12.31 creates a contradiction that most clearinghouses will catch, but some slip through to result in post-payment audits. Coders should confirm patient symptom status at the point of order, not at claim submission. Practice management software features that link clinical order entry to claim generation reduce the risk of this mismatch reaching the billing team without a flag.

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Medicare coverage and reimbursement

Medicare Part B covers annual screening mammography for female beneficiaries aged 40 and over. The benefit is classified as preventive, which means there is no patient cost-sharing (no deductible, no coinsurance) when the claim is coded correctly with Z12.31 and billed under 77067. Practices can verify locality-specific fee schedule rates through the CMS Physician Fee Schedule lookup tool.

Building EHR and billing system integrations that automatically attach the correct Medicare preventive service indicator to 77067 claims reduces the risk of triggering cost-sharing when the patient is entitled to a zero-copay service. This matters because patients who receive unexpected bills after a screening mammogram frequently dispute the charges, creating administrative overhead that can cost a practice more than the claim itself.

Frequency and age rules

• Age 35-39: One baseline screening mammogram covered by Medicare (no frequency limit on baseline).
• Age 40 and over: One screening mammogram every 12 months covered under Medicare Part B at no cost to the patient.
• Medicaid and commercial payers: Frequency and age rules vary by state and plan. Some commercial payers follow USPSTF recommendations (annual starting at 40 or biennial starting at 50). Always verify payer-specific policy before assuming the Medicare rule applies.

A common denial reason is submitting 77067 within 11 months of a prior screening mammography claim for the same patient. Medicare uses a 12-month look-back period. Some practices inadvertently hit this limit when a patient switches providers mid-year and the new practice bills without checking prior claim history. Maintaining a claim history lookup step in your pre-auth workflow catches most of these.

Reimbursement rates

Medicare reimbursement for CPT Code 77067 varies by MAC (Medicare Administrative Contractor) and geographic locality. Under the current Medicare Physician Fee Schedule, the national non-facility rate for the global service (no modifier) falls roughly in the range of $70-$100, but this figure shifts with annual RVU updates and locality adjusters. Use the CMS Physician Fee Schedule search to confirm the exact rate for your locality before quoting expected reimbursement to patients or setting your fee schedule.

Common billing errors and how to avoid them

Billing teams with strong paperless billing workflows tend to catch these errors before submission. Here are the most frequently cited sources of 77067 claim rejections and denials.

• Billing 77052 separately for CAD. CAD is bundled into 77067. Adding 77052 as an additional line item creates a duplicate-service edit that the payer’s claims system will automatically reject.
• Using a diagnostic ICD-10 code as the primary diagnosis. If the order was placed for screening but the coder selects a symptomatic diagnosis, the claim reprices as diagnostic. The patient may suddenly owe a deductible or coinsurance they were not expecting, leading to disputes and appeals.
• Billing 77066 instead of 77067. 77066 is bilateral diagnostic mammography. Substituting it for 77067 on a screening claim changes the reimbursement category and flags the claim for medical necessity review.
• Submitting 77067 within the look-back period. Medicare’s 12-month limit is strictly enforced. Check prior mammography claim dates before scheduling and submitting.
• Missing or incorrect facility accreditation. Under the Mammography Quality Standards Act (MQSA), only FDA-accredited facilities may perform and bill mammography. Claims submitted under a facility that lacks current MQSA accreditation will be denied at the payer level regardless of whether the procedure was performed correctly.
• Callback coding errors. When a patient is recalled after a BI-RADS 0 result on a 77067 screening, the follow-up additional views should be coded with a diagnostic code (77065 or 77066 as appropriate), not another 77067. Per Z Health Publishing coding guidance, using 77067 again for the callback exam misrepresents the clinical intent of the visit.

For practices managing multiple imaging modalities, the HIPAA compliance checklist for primary care provides a useful framework for documentation standards that apply across preventive and diagnostic imaging services. Structured claims management software that flags bundling violations before submission is one of the most practical ways to prevent the CAD and modifier errors listed above.

Conclusion

CPT Code 77067 is straightforward when the patient is asymptomatic, the order is bilateral, and the diagnosis code is Z12.31. The complexity creeps in at the edges: modifier splits, tomosynthesis add-ons, look-back period violations, and callback coding. Each error type has a distinct correction path, and most can be prevented with a well-configured billing workflow rather than post-denial appeal.

Pabau’s claims management software helps radiology and women’s health practices build those workflows into their daily operations, reducing the manual review burden on billing staff. To see how Pabau handles mammography and preventive imaging billing, book a demo.

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Frequently Asked Questions