CPT Code 19342: Delayed breast reconstruction billing guide

Key Takeaways

CPT Code 19342 describes delayed breast reconstruction with a permanent implant or tissue expander, performed at a separate operative session from the mastectomy.

The critical billing distinction: 19342 is delayed reconstruction; CPT 19340 is immediate reconstruction performed at the time of mastectomy. Timing documentation is what payers audit.

Laterality modifiers (RT, LT, or 50) are required on every claim; omitting them is the most common denial trigger for this code.

Pabau’s claims management software helps plastic surgery practices track modifier requirements, prior authorization status, and documentation completeness across breast reconstruction episodes.

CPT Code 19342 is the code used to report delayed breast reconstruction with a permanent implant or tissue expander. “Delayed” means the reconstruction occurs at a surgical session completely separate from the original mastectomy.

The American Medical Association (AMA), which owns and publishes the CPT code set, classifies 19342 under the Repair and/or Reconstruction of the Breast section of Surgery.

The official descriptor reads: Delayed breast reconstruction with implant or tissue expander placement following mastectomy.

This article covers the full billing picture for 19342, including how it differs from CPT 19340, which modifiers apply, 2026 Medicare reimbursement figures, documentation requirements, and the most common billing errors practices encounter.

CPT 19342 vs CPT 19340: Immediate vs delayed reconstruction

The 19340/19342 distinction trips up more breast reconstruction claims than any other coding issue. Both codes describe implant-based breast reconstruction following mastectomy. The only difference is timing, but it is a difference that determines both the correct code and the documentation required to support it.

A plastic surgery practice that routinely performs both immediate and delayed reconstruction needs a documentation workflow that captures the mastectomy date in the operative record for every 19342 claim.

Practices using digital forms and clinical documentation tools can build this as a required field, so the information is captured at the time of surgery rather than reconstructed from memory during billing review.

Modifiers for CPT Code 19342

Laterality is non-negotiable for breast reconstruction claims. Every submission of CPT Code 19342 requires a laterality modifier. Missing it is the single most preventable denial reason for this procedure.

For bilateral delayed reconstruction, modifier 50 on a single line item is the standard Medicare approach. Some commercial payers require two separate line items with RT and LT instead. Verify the individual payer’s billing instructions before submitting, since getting this wrong triggers a denial rather than an edit request.

Reimbursement rates and Medicare fee schedule for CPT 19342

Medicare reimbursement for CPT Code 19342 varies by setting and geographic location. The figures below reflect estimated 2026 national averages based on available fee schedule data.

Always verify current rates using the CMS Physician Fee Schedule lookup tool, since rates are updated annually and adjusted by Geographic Practice Cost Indices (GPCI) for each locality.

These figures are estimates derived from available fee schedule data and should be verified against the current CMS MPFS before relying on them for financial planning. Private payer rates vary considerably and are typically negotiated as a percentage of Medicare or as contracted amounts.

RVU breakdown for CPT 19342

Relative Value Units (RVUs) determine Medicare payment through the RBRVS system. Use the FastRVU 2026 RVU lookup tool to verify current values, since RVUs are updated with each annual fee schedule. The figures below are approximate 2026 values and are subject to annual revision by CMS.

The conversion factor changes annually. Multiply total RVUs by the current conversion factor and the applicable GPCI to calculate the locality-specific payment amount for any given practice location.

Documentation requirements for delayed breast reconstruction

Payer audits of CPT 19342 claims focus almost entirely on timing documentation. An operative note that does not explicitly confirm the reconstruction occurred at a separate session from the mastectomy will not survive a post-payment audit, regardless of how well the procedure itself is described.

Required elements in the operative record for a 19342 claim:

• Date of the original mastectomy (required to establish that reconstruction is delayed, not immediate)
• Confirmation that the current procedure is a separate operative session
• Implant type specified (permanent silicone or saline implant, or tissue expander)
• Laterality clearly stated (right, left, or bilateral)
• Implant manufacturer and lot number (required for implant tracking per FDA requirements)
• Patient’s post-mastectomy diagnosis code supporting medical necessity
• Surgeon attestation that reconstruction is being performed to restore breast form following mastectomy

Practices using structured client records and clinical note templates can pre-build these required fields so surgeons capture the information at the point of care, rather than relying on retrospective documentation reconstruction during billing review.

This matters because incomplete documentation is the second most common reason for CPT 19342 denials after missing laterality modifiers.

Related CPT codes for breast reconstruction

CPT 19342 sits within a family of breast reconstruction codes. Understanding how adjacent codes relate to 19342 reduces both undercoding and overbilling risk. The AAPC Codify CPT lookup provides descriptor text and coding notes for each of these.

When billing CPT 15777 alongside 19342, verify current National Correct Coding Initiative (NCCI) edits. Bundling rules for add-on codes in breast reconstruction have been subject to CMS edits, and submitting without confirming current edit status is a claim integrity risk.

Plastic surgery practices with high volumes of reconstruction cases benefit from the billing audit tools available in modern plastic surgery software.

Common billing errors and how to avoid them

Breast reconstruction billing generates a predictable set of errors. Most are avoidable with the right documentation workflow and pre-submission claim checks.

• Upcoding immediate as delayed: Billing 19342 when reconstruction was performed at the same operative session as the mastectomy. This is the most serious billing error in this code family, as it constitutes incorrect code selection and can trigger fraud and abuse scrutiny. Document the mastectomy date clearly and confirm the session dates do not match before selecting 19342.
• Missing laterality modifier: Submitting 19342 without RT, LT, or modifier 50 will result in an automatic edit or denial from most payers. Build laterality verification into your claim scrubbing workflow.
• Bundling 15777 without confirming NCCI: CPT 15777 is frequently billed with breast reconstruction codes, but NCCI edits apply. Always check current edit status before billing both on the same claim.
• Insufficient operative note: An operative note that describes the implant placement but omits the date of the prior mastectomy or fails to state this is a separate session will not survive payer audit. The note must explicitly establish the delayed nature of the procedure.
• Wrong code for tissue expander expansion visits: Subsequent expansion of a tissue expander placed under 19342 is not billed with 19342 again. Expansion visits use different codes. Verify the correct follow-on code for expansion versus exchange procedures.

Practices using automated claim review workflows can configure pre-submission checks that flag missing laterality modifiers and incomplete operative note fields before the claim reaches the payer.

Pre-authorization and payer considerations

Most commercial payers require prior authorization for CPT 19342. This is not universal, but it applies to the majority of major insurers including Anthem, UnitedHealthcare, and Aetna for reconstructive procedures. Medicare does not require prior authorization for CPT 19342 in most settings, though coverage determinations apply.

The Women’s Health and Cancer Rights Act (WHCRA) is the federal backstop for this procedure. The WHCRA, enforced by the US Department of Labor, requires group health plans and health insurance issuers that provide mastectomy coverage to also cover post-mastectomy breast reconstruction, including delayed reconstruction.

This means insurers cannot categorically exclude 19342 as cosmetic for post-mastectomy patients, though individual plan design and prior auth processes still apply.

• WHCRA coverage mandate: Applies to group health plans; covers reconstruction on the affected breast, surgery on the contralateral breast to achieve symmetry, and prostheses and treatment for complications.
• Prior auth timelines: Submit authorization requests well in advance of the surgical date. Delayed reconstruction is typically elective scheduling, so there is usually time to obtain approval before booking the OR.
• Medical necessity documentation: Payer medical policies for reconstructive breast surgery commonly require documentation of prior mastectomy, indication for reconstruction, and medical necessity narrative from the treating surgeon.
• Anthem policy note: Anthem publishes specific medical policies for breast reconstruction procedures. Review the applicable Anthem policy before submitting claims, as coverage criteria can include specific timing and documentation requirements beyond the WHCRA minimum.

Tracking prior auth status across multiple reconstruction episodes, particularly when a patient has both a tissue expander placement and a subsequent exchange procedure, is where practice management tools add real value.

Plastic surgery EMR platforms built for reconstructive practices typically include prior auth tracking as part of the claim management workflow.

How practice management software supports CPT 19342 billing

Breast reconstruction billing involves multiple moving parts: the original mastectomy claim, the reconstruction claim, potential expander exchange, revision procedures, and WHCRA compliance documentation. Managing this across a busy plastic surgery practice without a structured system leads to the exact errors described above.

Pabau is practice management software designed for plastic surgery and aesthetic clinics, including those performing post-mastectomy reconstruction. Specific capabilities relevant to CPT 19342 billing include:

• Claims management with modifier tracking built into the billing workflow
• Digital clinical documentation forms that can be configured to capture required fields (mastectomy date, implant type, laterality) at the point of care
• Compliance management tools supporting documentation audit readiness
• Automated workflows for prior authorization tracking and follow-up
• Patient-level record linkage connecting the mastectomy encounter to subsequent reconstruction claims for documentation continuity

Plastic surgery billing teams handling high reconstruction volumes also benefit from Pabau’s EMR tools designed specifically for plastic surgery practices, which include pre-built operative note templates aligned to common procedure types.

Manage breast reconstruction billing without the gaps

Pabau helps plastic surgery practices track modifier requirements, capture operative documentation at the point of care, and manage prior auth status across multi-episode reconstruction cases. See how it works for your team.

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Conclusion

CPT Code 19342 denials are almost always documentation failures rather than coverage disputes. The WHCRA mandates that post-mastectomy reconstruction be covered, so most CPT 19342 claims fail for operational reasons: missing laterality modifiers, absent mastectomy date references in the operative note, and timing ambiguity between immediate and delayed reconstruction.

Pabau’s claims management tools help plastic surgery practices catch these issues before submission, with configurable pre-submission checks and structured documentation templates. If your team wants to see how that works in practice, book a demo to walk through the billing workflow.

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