CPT® Code 17999: Unlisted Procedure, Skin, Mucous Membrane, Subcutaneous Tissue

CPT® code 17999 is used to report unlisted procedures performed on the skin, mucous membranes, or subcutaneous tissue when no specific CPT® code exists. This code allows providers to bill for unique or uncommon procedures while providing the necessary documentation for payer review and reimbursement.

When to Use CPT® Code 17999

• When performing a skin, mucous membrane, or subcutaneous tissue procedure that does not have an assigned CPT® code.
• For procedures that are rare, innovative, or highly specialized, such as novel excisions, reconstructive techniques, or experimental interventions.
• When documenting medical necessity and detailed procedure notes to support claim adjudication.
• Typically requires submission of operative notes or procedure description for payer review.

Billing Requirements

• Bill once per procedure; multiple unlisted procedures should be reported separately.
• Documentation must include procedure description, location, size, method, and rationale.
• Payers often require additional supporting documentation to determine fair reimbursement.
• May be used in conjunction with anesthesia or pathology services, billed separately.

Common Clinical Scenarios

• A dermatologic surgeon performs an uncommon excision or grafting procedure not otherwise coded.
• A cosmetic or aesthetic practice provides a novel subcutaneous treatment requiring unique procedural documentation.
• A reconstructive or integrative clinic performs a specialized mucous membrane procedure for therapeutic purposes.

Streamline Unlisted Procedure Documentation with OptiMantra

Billing for CPT® 17999 requires detailed documentation to ensure compliance and facilitate reimbursement. OptiMantra’s EMR and practice management platform allows providers to record procedure specifics, attach operative notes, and generate clean claims. For dermatology, aesthetic, and integrative practices, OptiMantra simplifies workflows, reduces administrative burden, and helps providers focus on patient care while capturing appropriate reimbursement.

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