Can we bill 15770 with 69620 for a myringoplasty with fat graft?
First, CPT describes 15770 as Graft, derma-fat-fascia meaning it is a graft that includes three layers of tissue. The procedure you describe says “fat graft” so 15770 is not accurate since fat is only one layer of tissue.
CPT 69620 states Myringoplasty (surgery confined to drumhead and donor area) so it includes obtaining the donor graft. Therefore, a myringoplasty with fat graft is reported using only one code, 69620.