Breast Reduction Surgery and Gynecomastia Surgery — CPB 0017 | AETNA Coverage Update

Aetna modified CPB 0017 covering breast reduction surgery (CPT 19318) and gynecomastia surgery (CPT 19300), effective September 26, 2025. Here's what billing teams need to know before submitting claims under this updated policy.

Aetna, a CVS Health company, updated Clinical Policy Bulletin 0017 governing breast reduction mammaplasty and gynecomastia surgery. The CPB 0017 Aetna system update touches CPT 19318 (reduction mammaplasty) as the primary covered procedure when selection criteria are met, alongside CPT 19300 (mastectomy for gynecomastia). If your practice or facility bills these codes for Aetna members, review your documentation standards now — before claims go out under the September 26, 2025 effective date.

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Quick-Reference Table

Field	Detail Copy
Payer	Aetna, a CVS Health company
Policy	Breast Reduction Surgery and Gynecomastia Surgery
Policy Code	CPB 0017
Change Type	Modified
Effective Date	September 26, 2025
Impact Level	High
Specialties Affected	Plastic Surgery, General Surgery, Breast Surgery, Surgical Oncology
Key Action	Audit documentation for CPT 19318 and CPT 19300 against updated medical necessity criteria before submitting claims dated on or after September 26, 2025

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Aetna Breast Reduction and Gynecomastia Coverage Policy: Medical Necessity Requirements 2025

The Aetna breast reduction surgery coverage policy under CPB 0017 treats CPT 19318 (reduction mammaplasty) as a covered procedure — but only when the member meets specific selection criteria. This is not open-ended coverage. Aetna classifies breast reduction as medically necessary in documented cases of symptomatic macromastia, where physical symptoms are substantiated by clinical evidence. Vague patient-reported complaints without objective documentation will not hold up on review.

For gynecomastia surgery, CPT 19300 (mastectomy for gynecomastia) falls under a separate grouping. Suction-assisted lipectomy of the trunk (CPT 15877) is also listed in the same coverage group. Both require medical necessity to be established through clinical documentation before prior authorization is submitted.

Prior authorization is the first line of defense on these claims. Aetna's coverage policy for breast surgery procedures historically requires pre-service review for elective surgical cases. Confirm prior auth requirements with the specific plan before scheduling — member-level benefits can vary, and some self-funded plans exclude these procedures entirely regardless of medical necessity.

Weight is a recurring factor in breast reduction claims. The policy references weight management classes (HCPCS S9449) as a related code, which signals Aetna looks at whether conservative measures were pursued before surgery. Document any pre-surgical weight management, physical therapy, or orthopedic referrals for shoulder and neck complaints. That documentation supports medical necessity and reduces your claim denial exposure at the prior auth stage.

The ICD-10 diagnosis codes Aetna ties to this policy include upper extremity paresthesia codes in the G56 family — G56.0 through G56.3 and their subcategories. This reflects Aetna's recognition that brachial plexus compression and upper extremity nerve symptoms can be a direct consequence of macromastia. If your surgeon is documenting neurological symptoms as part of the indication, make sure the G56.x code is on the claim and matches the clinical notes.

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Aetna Breast Reduction and Gynecomastia Exclusions and Non-Covered Indications

Several procedures listed in CPB 0017 are explicitly not covered under this policy. The HCPCS codes G6003 through G6016 — covering radiation treatment delivery — are categorized as not covered under this CPB. These codes appear in the policy as reference codes, not reimbursement pathways.

Mastopexy (CPT 19316) is listed as a related code but does not carry covered status under the standard selection criteria for CPT 19318. If a surgeon performs a combined reduction and lift, you need to document and justify each component separately. Don't assume the mastopexy reimbursement flows automatically with the reduction claim.

Air-assisted, nipple areola-sparing mastectomy is explicitly called out as not covered under CPT 19303 (mastectomy, simple, complete). The policy language is direct on this point. If your billing team defaults to 19303 for gynecomastia cases involving nipple-sparing technique, expect a claim denial. Use CPT 19300 for gynecomastia mastectomy, full stop.

Chemical exfoliation (CPT 17360) and photodynamic therapy (CPT 96573, 96567) appear in the related codes section but are not covered under CPB 0017. These are listed for reference — likely because they may come up in pre- or post-surgical skin management — but Aetna does not cover them under this CPB. Bill them under a separate, applicable policy if clinically warranted.

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Coverage Indications at a Glance

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Aetna Breast Reduction and Gynecomastia Billing Guidelines and Action Items 2025

These are your action items, tied directly to what CPB 0017 says. Run through each one before September 26, 2025 claims go out.

Copy Action Items

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CPT, HCPCS, and ICD-10 Codes for Breast Reduction and Gynecomastia Surgery Under CPB 0017

Covered CPT Codes (When Selection Criteria Are Met)

Code	Type	Description Copy
19318	CPT	Reduction mammaplasty

CPT Codes Covered in Gynecomastia / Surgical Group

Not Covered / Explicitly Excluded

Other CPT Codes Referenced in CPB 0017

These codes appear in the policy as related codes. They are not covered under CPB 0017 but may be billable under separate applicable policies.

Key ICD-10-CM Diagnosis Codes

The full ICD-10-CM code list under CPB 0017 includes 101 codes. The policy data provided above includes 26 codes from the G56 family. Review the full CPB 0017 document at Aetna's provider portal for the complete diagnosis code list.

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