CPT Code 76642: Limited breast ultrasound billing guide

Key takeaways

CPT Code 76642 describes a limited, unilateral breast ultrasound performed in real time with image documentation, covering only a targeted area of the breast.

Use modifier LT or RT to indicate laterality. Modifier 59 or XS is required when billing 76642 alongside mammography codes 77065 or 77066 on the same day.

76641 (complete breast ultrasound) and 76642 (limited) are generally mutually exclusive under NCCI edits for the same breast on the same date of service.

Pabau’s claims management software embeds CPT code selection and modifier logic into the charge capture workflow, reducing rejection rates on breast ultrasound claims.

CPT Code 76642 is the billable code for a limited, unilateral breast ultrasound performed in real time with image documentation. It covers a targeted area of breast tissue, such as a palpable lump or a specific mammography finding, rather than the entire breast. This guide covers the official descriptor, clinical indications, modifiers, ICD-10 pairings, the 2026 Medicare fee schedule, same-day billing rules, and documentation requirements.

Medical coders at radiology groups, billing managers at OB-GYN practices, and practice administrators handling breast imaging claims all rely on this code every day. This reference page gives the verified facts you need before submitting a claim.

CPT Code 76642: Definition and official descriptor

CPT Code 76642 is the AMA’s Current Procedural Terminology code for: Ultrasound, breast, unilateral, real time with image documentation, including axilla when performed; limited. It applies when a physician or qualified healthcare professional performs a real-time scan of a targeted or limited area of breast tissue. This is a more focused exam than a comprehensive examination of the entire breast. The axilla exam is included in the code and is not separately billable. Coders should not additionally bill an axillary ultrasound, such as CPT 76882, for the same encounter.

“Limited” is the operative word. The exam covers a specific region, such as a palpable lump, a focal area flagged on prior mammography, or a targeted quadrant. It does not cover the whole breast. The code is unilateral by definition. Bilateral billing method varies by payer and MAC. Some require two line items with LT and RT modifiers. CMS Medicare Coverage Database article A52849 instead instructs providers to report modifier 50 for bilateral breast ultrasound. Confirm the preferred method with each payer before submitting.

The procedure uses high-frequency sound waves to generate real-time images, and image documentation is an explicit part of the descriptor. Claims without evidence of captured images will not satisfy Medicare’s documentation requirements for this code.

Clinical indications for CPT Code 76642

Medicare and most commercial payers cover CPT Code 76642 when medical necessity is established. The most common clinical scenarios that support use of this limited breast ultrasound code include:

• Palpable breast lump or mass – evaluating a newly identified or previously noted lump to determine whether it is solid or cystic
• Targeted follow-up from mammography – characterizing a specific finding identified on a prior screening or diagnostic mammogram (e.g. asymmetry, focal density)
• Nipple discharge evaluation – assessing the retroareolar ducts in a limited region
• Post-biopsy or post-surgical assessment – evaluating a limited area following a prior intervention, including seroma or hematoma assessment
• Supplemental screening in dense breast tissue – limited targeted scan when dense tissue limits mammographic sensitivity, per ACR practice guidelines
• Cyst aspiration guidance – real-time guidance for a procedure targeting a known cyst

The ordering physician’s documentation must clearly link the clinical indication to the specific area examined. Vague orders such as “evaluate breast” without a targeted finding are a common trigger for medical necessity denials.

CPT Code 76641 vs 76642: Key differences

The distinction between 76641 (complete) and 76642 (limited) is the most common source of coding errors in breast ultrasound billing. The American College of Radiology (ACR) defines a complete breast ultrasound as systematic evaluation of the entire breast. A limited exam, by contrast, covers only a targeted area.

Billing both 76641 and 76642 for the same breast on the same date of service is generally prohibited. This falls under National Correct Coding Initiative (NCCI) Procedure-to-Procedure (PTP) edits. Practices should verify the current NCCI edit table quarterly, as CMS updates these edits four times per year.

CPT Code 76642 modifiers

Correct modifier use is the single biggest variable in 76642 claim outcomes. Missing or incorrect modifiers are a leading cause of rejections on breast ultrasound claims. The following modifiers apply:

Laterality modifiers (LT/RT) are required by most Medicare Administrative Contractors (MACs) and many commercial payers. Omitting them on unilateral breast ultrasound claims is a frequent reason for claim holds. When both breasts are examined on the same date, billing method varies by payer. Some want two line items, 76642-LT and 76642-RT. CMS Medicare Coverage Database article A52849 instead instructs providers to append modifier 50 on one line for bilateral breast ultrasound. Confirm which method each payer requires before submitting.

The professional/technical component split (modifiers 26 and TC) applies when the interpreting physician and the imaging facility are separate entities. Global billing (no modifier) is appropriate only when the same provider both performs and interprets the study in a non-facility setting.

ICD-10 codes used with CPT Code 76642

Pairing CPT Code 76642 with a supported ICD-10-CM diagnosis code is a prerequisite for medical necessity. The CMS ICD-10 codes page and applicable Local Coverage Determinations (LCDs) list the accepted diagnosis codes for breast ultrasound. The most frequently used ICD-10-CM codes with 76642 are:

Always verify the applicable MAC’s LCD for the most current list of covered diagnoses. Coverage determinations differ between MACs, including Novitas, CGS, NGS, Noridian, Palmetto, and WPS. A diagnosis code covered under one MAC’s LCD may not appear on another’s list.

CPT Code 76642 reimbursement and 2026 fee schedule

Reimbursement for CPT Code 76642 depends on place of service, geographic location, and whether the claim is global, professional-only, or technical-only. CPT 76642 carries 2.50 total RVUs. Multiplied by the 2026 conversion factor of $33.4009, that puts the national non-facility rate at approximately $83.50 before Geographic Practice Cost Index (GPCI) adjustments. GPCI locality adjustments typically shift this rate by a few percent in either direction. Practices should verify their exact locality rate using the CMS Physician Fee Schedule lookup tool before relying on these figures for contract negotiations.

Commercial payer rates for CPT Code 76642 vary considerably and are not tied to the Medicare fee schedule. Practices with high breast ultrasound volume should benchmark their contracted rates against the Medicare rate and negotiate accordingly. Tracking payments received against the fee schedule using electronic remittance advice (ERA) data is the most reliable way to identify systematic underpayments.

Submitting claims electronically through a clearinghouse reduces payment delays. Pabau integrates directly with Claim.MD, its US clearinghouse partner, to support real-time eligibility checks and ERA posting for breast imaging claims. Submitting claims through this clearinghouse also reduces the manual reconciliation burden when tracking 76642 payments across multiple payers.

Medicare coverage requirements for CPT Code 76642

According to CMS Medicare Coverage Database article 52849, CPT Code 76642 is covered by Medicare Part B when all of the following conditions are met:

• Treating physician order: The service must be ordered by a treating physician or appropriate non-physician practitioner with an established patient relationship.
• Qualified provider: The study must be performed by a physician or qualified non-physician practitioner meeting Medicare’s supplier standards for diagnostic imaging.
• Medical necessity documentation: The medical record must support the clinical indication for a limited (not complete) breast ultrasound. A treating clinician’s note linking a specific finding to the targeted scan is required.
• Image documentation: Real-time image capture is inherent in the code descriptor. Claims that cannot produce imaging evidence are at risk of denial or recoupment on audit.
• Covered diagnosis: The accompanying ICD-10-CM code must appear on the applicable MAC’s LCD covered diagnosis list for breast ultrasound.

Ensuring compliance with these requirements matters most for practices billing 76642 at high volume. MAC post-payment audits of breast imaging codes have increased in recent years. Practices should also review whether their MAC has issued any policy articles supplementing the national coverage guidance.

Same-day billing: CPT 76642 with mammography

A common question in radiology billing is whether CPT Code 76642 can be billed with diagnostic mammography on the same date of service. The mammography codes are 77065 for unilateral and 77066 for bilateral exams. The short answer: yes, with correct modifiers and separate documentation supporting medical necessity for each service.

CMS permits billing both codes when the breast ultrasound and the mammography are distinct services, each with their own clinical indication. The ultrasound might evaluate a palpable lump while the mammogram assesses the broader breast tissue. The 837 electronic claim file must clearly reflect each service as a separate line item.

Can CPT 76641 and 76642 be billed together?

No. NCCI PTP edits generally prohibit billing CPT 76641 (complete breast ultrasound) and CPT 76642 (limited breast ultrasound) for the same breast. That applies on the same date of service. The complete examination (76641) includes all targeted areas by definition, so the limited code adds no separately payable service. If both are billed, the claim will typically bundle down to the lower-value code or be rejected entirely.

The same-day billing rules for 76642 with mammography are straightforward in principle but require precise modifier application in practice:

1. Bill 76642 with the appropriate laterality modifier (LT or RT).
2. Append modifier 59 or XS to 76642 to signal a distinct procedural service from the mammography code.
3. Ensure the medical record contains separate documentation for each service: a distinct clinical indication, separate images, and a separate report. Clearly delineated findings within one combined report also satisfy this requirement.
4. Verify the payer’s specific policy. Some commercial payers may bundle these services regardless of modifier, particularly if they have established their own NCCI-equivalent edits.

Documentation best practices for CPT Code 76642

Documentation deficiencies are the most common reason for 76642 claim denials on audit. These are the elements every 76642 claim record should contain:

• Ordering indication: A specific clinical finding that justifies a limited (not complete) examination. “Palpable lump, right upper outer quadrant” is sufficient. “Breast pain” alone typically is not.
• Laterality: Explicitly documented in both the order and the report. The imaging report and the ICD-10 code must match the modifier applied to the claim.
• Targeted region: The report should identify which quadrant, region, or structure was examined. This differentiates a limited exam from a complete one.
• Images captured: The imaging system’s log or the report should confirm real-time image capture and documentation, as this is explicit in the code descriptor.
• Interpreter credentials: The reading physician’s credentials must meet payer requirements for diagnostic ultrasound interpretation.
• Separate reports for same-day services: When billing 76642 alongside 77065 or 77066, the imaging report must document findings for each service distinctly. Clearly delineated sections per service also satisfy this requirement.

A clean claim submission for 76642 requires that all these elements appear in the record before the claim is submitted, not reconstructed after a denial. Building a documentation template into your imaging workflow is the most effective way to maintain consistency across providers. Practices should also track billing denial codes specific to breast ultrasound claims to identify recurring documentation errors.

How practice management software supports 76642 billing

Preventable 76642 claim errors usually come from a disconnect between where documentation is captured and where claims are submitted. When those two steps happen in different systems, modifiers get missed and ICD-10 codes get copied from the wrong encounter. Revenue cycle management suffers at every step as a result.

Pabau’s claims management software embeds CPT code selection and modifier logic into the charge capture step rather than treating it as a separate downstream process. For a breast imaging practice billing 76642 at volume, this means:

• Laterality modifiers (LT/RT) are applied at the point of documentation, not retrospectively during claim scrubbing.
• ICD-10-CM codes are linked to the CPT code during charge entry, reducing the risk of pairing an unsupported diagnosis with 76642.
• Same-day services with mammography can be flagged automatically for modifier 59/XS review before claim submission.
• Reimbursement tracking by payer allows practices to identify which commercial contracts are underpaying relative to the Medicare fee schedule.

Practices using standalone lookup tools, such as reference websites or printed codebooks, must manually transfer that data into a billing or EHR system. That extra step is where errors are most often introduced. Pabau’s denial management workflow also captures the CARC (Claim Adjustment Reason Code) from ERA data. Recurring 76642 denial patterns become visible without manual spreadsheet tracking. Combined with superbill generation, the complete billing cycle from documentation to payment posting happens within a single platform. Pabau does not replace certified coder judgment, but it reduces the manual touchpoints where errors are most likely to occur.

Simplify breast imaging billing with Pabau

Pabau’s built-in claims management workflows embed CPT code selection, modifier logic, and ICD-10 pairing into charge capture. This reduces 76642 rejections from incorrect modifiers or missing diagnosis codes.

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Conclusion

CPT Code 76642 claims fail most often for three reasons: missing laterality modifiers, unsupported ICD-10-CM pairings, and incomplete documentation when same-day mammography is also billed. All three are preventable with a consistent pre-submission checklist and a billing workflow that connects documentation to charge capture.

For practices billing breast imaging at scale, Pabau’s integrated claims management keeps CPT code selection, modifier application, and reimbursement tracking in one place. To see how Pabau handles breast imaging billing end to end, book a demo with the team.

Continue your research

Need help understanding the full claims submission workflow? What is medical billing explains how charge capture, claim scrubbing, and payer adjudication connect in a single billing cycle.

Seeing ERA discrepancies on breast imaging payments? Electronic remittance advice covers how to read and act on ERA data to catch systematic underpayments by payer.

Want to reduce breast imaging claim rejections before submission? Clean claim submission outlines the pre-submission checks that prevent the most common CPT billing errors.

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