Medicare AdvantageBilling CodesLow impact
MA05.033e, External Breast Prostheses
Independence Blue Cross·Oncology, General Surgery, Plastic Surgery·Medical Policy
Effective date
Oct 1, 2025
We identified it
Jun 19, 2026
Summary
Independence Blue Cross (IBX) Medicare Advantage has reissued policy MA05.033e as MA05.033f, adding two new ICD-10 diagnosis codes (C50.A1 and C50.A2 for malignant inflammatory neoplasm of breast) to the list of qualifying diagnoses for external breast prosthesis coverage. The coverage intent and medical necessity criteria remain unchanged; this is primarily a code expansion to align with current Medicare guidelines.
Action Required
By October 1, 2025: Billing team must update billing system and clinical documentation requirements to recognize ICD-10 codes C50.A1 (malignant inflammatory neoplasm of right breast) and C50.A2 (malignant inflammatory neoplasm of left breast) as qualifying diagnoses for external breast prosthesis coverage under IBX Medicare Advantage plans. Update EMR templates and billing software validation rules to accept these codes alongside existing C50.0xx series codes. No workflow changes needed as coverage criteria remain identical; this is a diagnostic code addition only. Verify system reflects MA05.033f (superseded version MA05.033e) to prevent claim denials.