Ask Dr. Z

Patient with chronic abscess cavity in post coccygeal resection bed with chronic drainage catheter in place. Patient was placed on fluoro table in prone position. Contrast was injected through the drain, then flushed with sterile saline. Drain and surrounding skin were prepped. Drain was advanced back into appropriate position and again flushed with sterile saline and placed back to bulb drainage. Findings: Coccygeal abscess cavity fills and drains via drain; however, it had pulled back slightly. A plug was cleared from the drain, improving drainage, then was repositioned back to where it had been previously to improve function. Cavity was fully evacuated." We are finding no CPT code for imaging, flushing, repositioning coccygeal abscess drain, so we assigned code 20999 after eliminating codes 49423, 49424 (out of category), and 10030. How would you code this, and what's your rationale?