Need CPT for Silverstein permanent aeration tube intraosseous placement

Surgeon performed the following:

Left mastoid tympanoplasty with ossicular chain reconstruction.
Temporalis fascia graft harvest.
Silverstein permanent aeration tube intraosseous placement.

Please advise what CPT code (if any) could be used for this surgery. Surgeon states it takes 25 minutes to perform the placement. May need to code for 69632 with modifier -22 and send operative notes.

Annette M Roberts, CPC
Business Office Manager
Piedmont ENT & Related Allergy
Atlanta, GA
aroberts@piedent.com
404-351-5045