CPT Code 17999: Unlisted Procedure, Integumentary System

CPT code 17999 is used for unlisted skin, mucous membrane, or subcutaneous procedures. Ensure proper modifiers and documentation for Medicare reimbursement.

Use Code

Frequently asked questions

For code 17999 Medicare reimbursement, providers must include supporting documentation such as medical necessity and a comparable listed code. This helps justify the service and ensures correct payment from Medicare, especially when no existing code accurately reflects the procedure performed.

A health care professional may use this modifier when the service use of this modifier is necessary to reflect a distinct procedural service—such as during a postoperative period use or when multiple unrelated services are billed together.

Yes. A surgeon may use this modifier—like modifier 80, 81, or 82—if an assistant is required for the procedure and appropriately documented. This ensures the procedure uses of this modifier align with Medicare’s billing guidelines.

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