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Codes are assigned when a procedure or service is performed by a provider for which there is no CPT code.
unlisted therapeutic procedure
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.
76999
unlisted therapeutic procedure
CPT code 90899 : Unlisted psychiatric service or procedure
CPT Code 96999- Unlisted special dermatological service or procedure.
it is an unlisted procedure so 17999
Appendix.
CPT code 69949 (Unlisted procedure, inner ear)
41899 is a CPT Surgery / Digestive System procedure code for: Unlisted procedure, dentoalveolar structures.
41899 is a CPT Surgery / Digestive System procedure code for: Unlisted procedure, dentoalveolar structures.