CPT Code 99199: Unlisted Special Service, Procedure, or Report

CPT code 99199 should be used when a healthcare provider performs a medical service, procedure, or report that does not have a specific, existing CPT code assigned to it. This unlisted code is intended for unique, experimental, or infrequently performed services that cannot be accurately reported with any other CPT code.

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When billing with CPT code 99199, you must submit thorough documentation that clearly describes the service or procedure performed and explains why no specific CPT code applies. This should include a detailed operative or procedural note, a cover letter justifying the use of the unlisted code, and references to comparable codes if possible.

Any healthcare facility or provider—including hospitals, outpatient clinics, physician offices, and specialty practices—can use CPT code 99199 when reporting a service or procedure that lacks a designated CPT code.