HCPCS Level II code C1789 represents an implantable breast prosthesis used in reconstructive or cosmetic breast procedures. As an HCPCS Level II device code, C1789 is used on facility and supplier claims to identify the prosthetic device itself rather than the surgical procedure. Nationally, accurate coding of implantable prostheses affects device tracking, billing clarity between device and surgical services, and payer coverage determinations for reconstruction following mastectomy or augmentation.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how the code is applied in clinical billing, typical sites of service where the device is implanted, and the payer landscape that commonly adjudicates claims for breast prostheses. The publication summarizes common modifier use and coding considerations, outlines typical documentation elements needed to support device billing, and highlights where data is not available in the input.

This summary is written for a national audience and provides practical context for coding teams, revenue cycle leaders, and clinicians involved in breast reconstruction and implantable device supply chain management. Data not available in the input is identified where relevant.