HCPCS Code G0202: Screening mammography, bilateral

Key Takeaways

HCPCS Code G0202 described bilateral screening mammography (two views per breast) including computer-aided detection (CAD) when performed, under Medicare.

G0202 was deleted effective January 1, 2018 per CMS Transmittal R3844CP and crosswalks to CPT code 77067 for dates of service from that date forward.

Billing G0202 for dates of service after December 31, 2017 will trigger a claim denial; use CPT 77067 for current bilateral screening mammography claims.

Pabau’s claims management software helps radiology and primary care practices track code transitions, reduce denials, and document Medicare billing requirements accurately.

HCPCS Code G0202: definition and code descriptor

Most billing denials for mammography claims trace back to one source: using a code that no longer exists. Claims management software can catch these errors before submission, but understanding the code history is what prevents them from recurring.

HCPCS Code G0202 was a Level II Healthcare Common Procedure Coding System code maintained by the Centers for Medicare and Medicaid Services (CMS). Its official descriptor read:

Screening mammography, bilateral (2-view study of each breast), including computer-aided detection (CAD) when performed.

G0202 covered a bilateral mammogram producing a direct digital image, with two views of each breast. The inclusion of CAD was conditional: the code applied whether or not CAD was used, but CAD could not be separately billed on top of G0202 during the periods when it was bundled into the descriptor.

G0202 short descriptor and coverage status

Why HCPCS Code G0202 was deleted in 2018

The deletion of G0202 was not a surprise. CMS had been signalling the transition for a full calendar year before it took effect.

For the 2017 calendar year, CMS operationalised new CPT coding rules for mammography by updating the descriptors of G0202, G0204, and G0206 to match the new CPT code language for 77067, 77066, and 77065. The two systems ran in parallel: Medicare continued accepting the legacy HCPCS G codes during 2017, while the updated descriptors aligned them with their AMA CPT equivalents.

Effective January 1, 2018, CMS Transmittal R3844CP formally deleted G0202 and replaced it with CPT code 77067. The same transmittal deleted G0204 (crosswalk to CPT 77066) and G0206 (crosswalk to CPT 77065). From that date, Medicare and most commercial payers required the CPT codes rather than the legacy HCPCS G codes for all mammography claims.

The underlying rationale was alignment. The AMA CPT Editorial Panel had updated the mammography code set to reflect changes in imaging technology, particularly the shift to direct digital imaging. CMS chose to adopt the CPT framework rather than maintain a separate HCPCS track, reducing the dual-coding burden on billing staff across radiology and primary care settings.

G0202 crosswalk to CPT 77067: what changed and what stayed the same

The crosswalk from G0202 to CPT 77067 was direct: same clinical service, different code. For billing staff, the transition required updating charge masters and encoder software, not relearning clinical criteria.

One important addition under the CPT framework: digital breast tomosynthesis (DBT). CPT 77063 is an add-on code for screening DBT, bilateral, and per CMS Transmittal R3844CP, it must be billed alongside the primary code 77067. It cannot be submitted as a standalone claim. No equivalent add-on existed under the legacy G0202 framework for Medicare billing.

The full mammography crosswalk from the 2018 transition is:

• G0202 (screening mammography, bilateral) crosswalks to CPT 77067
• G0204 (diagnostic mammography, bilateral, including CAD) crosswalks to CPT 77066
• G0206 (diagnostic mammography, unilateral, including CAD) crosswalks to CPT 77065

Medicare coverage and ICD-10 diagnosis codes used with HCPCS Code G0202

When G0202 was active, Medicare coverage was classified as carrier judgment. That meant individual Medicare Administrative Contractors (MACs) held discretion over coverage determinations, rather than there being a single national coverage decision applied uniformly.

For screening mammography claims, Medicare requires specific ICD-10-CM diagnosis codes. Using the wrong diagnosis code is one of the most common reasons these claims are denied. The primary screening code for breast cancer detection is Z12.31 (Encounter for screening mammogram for malignant neoplasm of breast). A second commonly paired code is Z80.3 (Family history of malignant neoplasm of breast), used when family history is the documented clinical indicator.

Understanding medical documentation practices across claim types is essential here: submitting a diagnostic ICD-10 code on a screening mammography claim, or vice versa, changes both coverage eligibility and patient cost-sharing obligations. Medicare covers one screening mammography per year for women 40 and older under Section 1861(jj) of the Social Security Act, and accurate diagnosis coding is what links the claim to that benefit.

Diagnosis code pairing requirements for Medicare

• Z12.31: Encounter for screening mammogram for malignant neoplasm of breast (primary screening indicator)
• Z80.3: Family history of malignant neoplasm of breast (secondary indicator when relevant)
• Z15.01: Genetic susceptibility to malignant neoplasm of breast (e.g. BRCA-positive patients)

Submitting a diagnostic code (such as a breast mass or finding) alongside a screening mammography code will reclassify the claim as diagnostic in many payer systems, affecting both the applicable procedure code and patient responsibility. Accurate ICD-10 pairing is not optional; it determines reimbursement pathway and claim outcome. Practices that track HIPAA compliance requirements for medical offices will recognise proper diagnosis documentation as a core billing safeguard.

Who can bill HCPCS Code G0202 (and now CPT 77067)?

During the period G0202 was active, billing eligibility was tied to provider type, scope of practice, and payer-specific rules. The question of whether primary care physicians could bill G0202 came up frequently in multi-specialty and rural settings.

The general rule under Medicare: screening mammography must be performed by or under the supervision of a physician, using Medicare-approved mammography equipment. Radiologists and radiology practices are the typical billers. However, primary care practices that operate or have access to approved mammography equipment can, in principle, bill the code, provided they meet all supervision, equipment certification, and documentation requirements. Scope of practice and state law add another layer of qualification.

Payer rules vary significantly for commercial insurers. Not all commercial payers adopted the CMS 2018 crosswalk on the same timeline. Some continued accepting the legacy G codes for transitional periods. Billing staff working with both Medicare and commercial payers through 2018 needed to verify each payer’s effective date independently before switching code sets. Connecting patient scheduling workflows to payer-verified billing rules helped practices manage this across high-volume mammography programs.

Under the current CPT 77067 framework, the same billing eligibility rules apply. The code transition did not alter who may bill for screening mammography; it only changed the code used to report the service.

Computer-aided detection (CAD) and HCPCS Code G0202 billing

CAD added a layer of complexity to mammography billing that persisted across the G0202 era and into the CPT transition. Understanding how CAD affected reimbursement requires separating two distinct billing periods.

Before the G0202 descriptor update (pre-2017): CAD for mammography was separately billable using CPT 77052 (for screening) or 77051 (for diagnostic). Practices would bill G0202 for the mammogram itself and add the CAD code to capture that additional service. This dual-code approach was standard across many radiology practices billing Medicare.

After the descriptor update (2017 onward): CMS revised the G0202 descriptor to include CAD “when performed,” bundling the service into the primary code. Separate billing of 77052 alongside G0202 was no longer appropriate once the updated descriptor applied. The same bundling logic carried through to CPT 77067: CAD is included in the 77067 payment when performed and cannot be separately reported for Medicare.

Commercial payers have not uniformly followed this bundling approach. Some continued reimbursing CAD as a separate line item during the transition period. Billing staff handling mixed payer portfolios needed to maintain separate billing rules by payer, a workflow that highlights why paperless compliance documentation with per-payer rules is critical in multi-payer radiology settings.

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Billing guidelines and documentation requirements

Whether billing under the legacy G0202 or its current replacement CPT 77067, the documentation requirements for Medicare screening mammography claims have remained consistent. What changed is the code on the claim form, not the clinical record that supports it.

Medicare requires the following to support a screening mammography claim:

• An order from the treating physician or qualified nonphysician practitioner
• Evidence that the service was performed on Medicare-certified mammography equipment
• A bilateral study with the required views documented in the radiology report
• The appropriate screening ICD-10-CM diagnosis code (Z12.31 primary)
• Patient eligibility confirmed (at or over 40, or as otherwise covered by the patient’s Medicare benefit)

A common documentation gap that triggers denials: submitting a screening mammography code when the clinical record shows the study was ordered to evaluate a known or suspected finding. That changes the claim to diagnostic, requiring 77066 or 77065 depending on laterality, along with an appropriate diagnostic ICD-10 code. The procedure code must match the clinical intent documented at the time of the order. Practices with strong digital patient intake forms can capture clinical intent at the point of referral, reducing coding errors downstream.

Type of bill considerations for facility claims

HHS guidance updated the applicable Type of Bill (TOB) codes for mammography claims, removing 12X from the list of valid TOBs for diagnostic mammography while adding G0202 to the valid codes for screening mammography billing. Facility billers need to confirm their TOB selection aligns with both the procedure code type (screening vs. diagnostic) and the setting of service, as facility and professional claim requirements differ. Understanding primary care EHR systems that integrate billing with clinical documentation can reduce these errors significantly in mixed-setting practices.

Related mammography codes and the current coding framework

G0202 did not exist in isolation. Understanding the full mammography code family helps billing staff correctly identify the right code across screening, diagnostic, and tomosynthesis scenarios.

CPT 77057 was the predecessor screening bilateral code before the 2017-2018 transition and is now also retired for Medicare. Practices that have not performed a complete code review since 2018 may still carry 77057 or the legacy G codes in their charge masters. The AAPC Codify HCPCS code lookup tool and the CMS annual list of valid CPT and HCPCS codes are the reference points for confirming current code validity. For broader context on how CPT procedure code resources are structured, the AMA provides annual updates that feed directly into this kind of code replacement cycle.

Conclusion

HCPCS Code G0202 closed a chapter in mammography billing that many practices handled poorly: claims continued arriving with deleted codes, CAD was separately billed after bundling rules changed, and diagnosis codes were mismatched to clinical intent. The 2018 transition to CPT 77067 resolved the code itself, but the workflow gaps it exposed remain relevant today.

Accurate mammography billing now depends on three things: using CPT 77067 (never G0202) for dates of service from January 1, 2018 onward, pairing the correct ICD-10-CM diagnosis code to match clinical intent, and applying the 77063 add-on only when digital breast tomosynthesis is performed and billed alongside the primary code. Pabau’s claims management software gives radiology and primary care teams a structured way to track these rules, flag stale codes before submission, and build cleaner billing workflows. To see how it handles mammography and other high-volume code sets, book a demo with the Pabau team.

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