In simple words: This code represents a procedure performed on the skin, mucous membranes, or underlying tissue that doesn't have a specific code.It's essential that your doctor provides detailed records along with the claim to explain the procedure and why this code is being used.

This code is used for any unlisted procedure performed on the skin, mucous membranes, or subcutaneous tissue when no other CPT code accurately describes the service provided. For accurate reporting, detailed documentation should accompany the claim, outlining the nature, extent, and necessity of the procedure, along with the time, effort, and equipment involved.

Example 1: A surgeon performs a complex repair of a skin wound using an innovative technique not described by any other CPT code. This scenario necessitates the use of 17999., A physician injects a newly approved, experimental medication into subcutaneous tissue for a clinical trial. As this specific injection doesn't have its own code, 17999 would be reported, along with thorough documentation., A dermatologist performs a procedure that combines elements of several existing skin procedures, but no single code accurately captures the totality of the treatment provided.17999 is reported along with documentation explaining this combination of procedures.

Supporting documentation must be submitted along with the claim, including a detailed operative report describing the procedure performed, the medical necessity for the procedure, the time, effort, and equipment necessary, and a comparison to a similar procedure with a designated CPT code to justify the billed amount.

** For accurate billing, when using 17999, report a similar CPT code alongside it for comparison and pricing reference. It is also helpful to consult your regional Medicare Administrative Contractor (MAC) or commercial payer for specific billing guidance and reimbursement policies.