The AMA has published coding guidance through CPT Assistant for injection of a scar neuroma or scar tissue, which are provided below.
November 2013 page 14
Frequently Asked Questions:Surgery: Nervous System
Question: Is code 11900, Injection, intralesional; up to and including 7 lesions, or the unlisted code 64999 the appropriate code to report for injections of neuromas?
Answer: Neither code is appropriate to report for injections of neuromas. A "neuroma" is a thickening of scar tissue on the nerve and/or lining of the nerve; therefore, the appropriate nerve injection code should be reported based on the nerve injected. For example, code 64455, Injection(s), anesthetic agent and/or steroid, plantar common digital nerve(s) (eg, Morton's neuroma), and code 64632, Destruction by neurolytic agent; plantar common digital nerve, would be reported for a neuroma injection involving the plantar nerves in the foot.
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September 2010 page 10
Surgery: Nervous System, 64999 (Q&A)
Question: The patient has postmastectomy pain in the scar tissue area and not in the muscle. An injection was performed into the scar tissue of the chest area using a mixture of triamcinolone topical, lidocaine with epinephrine, and bupivacaine hydrochloride with epinephrine. What CPT code should be reported for this procedure?
Answer: Injection of painful scar tissue is reported using CPT code 64999, Unlisted procedure, nervous system. When reporting an unlisted code to describe a procedure or service, it is necessary to submit supporting documentation (eg, procedure report) along with the claim to provide an adequate description of the nature, extent, and need for the procedure, and the time, effort, and equipment necessary to provide the service.