India ink tatto colon performed via stoma

Patient had a colonoscopy via the stoma. Polyps were found and tattooed with india ink before removal by snare. Additional polyps were found and removed by hot biopsy. Physician then inserted scope per the rectum and found no lesions. How would you code for the india ink tatto since colon was done via the stoma. CPT code 45381 is for direct submucosal injection performed by regular colonoscopy. Thanks in advance for any help with this.

Peggy