Antibiotic spacer in shoulder?

Patient had a chronically infected shoulder from prior rotator cuff repair.
Procedure performed:
1. I&D.
2. Functional antibiotic spacer placement.
3. Biceps tenodesis.

Dr. billed 23470 and 23030. Because this is a "functional" spacer, is it correct to bill 23470? If not, how should this be coded?

Any help is greatly appreciated!
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