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Appendix.
If I'm understanding your question correctly, the answer is yes. If a procedure or service is not found in the CPT codebook, a "unlisted procedure" number is used.
Codes are assigned when a procedure or service is performed by a provider for which there is no CPT code.
Appendix D of the CPT manual lists all add-on codes.
Appendix D of the CPT manual lists all add-on codes.
unlisted therapeutic procedure
what is the mediastinum category code range in the cpt manual
CPT code 90899 : Unlisted psychiatric service or procedure
CPT Code 96999- Unlisted special dermatological service or procedure.
76999
unlisted therapeutic procedure
Hyphen