My Provider did a coccyx joint injection and I can not find the correct CPT code. The Dx code is M53.3 (sacrococcygeal disorder) He coded 20604 and I can not bill that code with the diagnosis code M53.3. It is not 64450 and he said it is not 62323. what code can I use?
Documentation
Reason for Appointment
1. Coccyx pain

Assessments
1. Sacrococcygeal disorders, not elsewhere classified – M53.3 (Primary), Sacrococcygeal joint injection performed today with ultrasound guidance for coccyx pain. Had a periarticular injection performed a few weeks ago without much benefit. He has continued pain at the tip of the sacrum. He wants to explore all options before considering surgery on the spondylolisthesis at the lower lumbar spine. He has tenderness over the sacrococcygeal joint. With ultrasound guidance I advanced a 25-gauge needle using a cephalad to caudal approach into the sacrococcygeal joint. 6 mg Celestone and 1 cc 2% lidocaine injected