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a
Unlisted Procedures.
Appendix.
Codes are assigned when a procedure or service is performed by a provider for which there is no CPT code.
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.
Unlisted cardiovascular procedure, diagnostic nuclear medicine 78499 pg. 395 (cpt 2011)
yes
CPT modifiers are used to clarify services and procedures performed by providers. A list of all CPT modifiers with a brief description is located insider the front cover of the coding manual.
unlisted therapeutic procedure
CPT code 90899 : Unlisted psychiatric service or procedure
CPT Code 96999- Unlisted special dermatological service or procedure.
76999