Hi Riaz!

D7953 - bone replacement graft for ridge preservation - per site
Can be cross coded to:
21210 - Graft, bone; nasal, maxillary or malar areas (includes obtaining graft)
21215 - Graft, bone; mandible (includes obtaining graft)
**use modifier -52 for reduced services when bone is not obtained from patient


D4266 - guided tissue regeneration - resorbable barrier, per site

There is not a direct crosscode available for this service, so if the medical insurer will not accept the "D" code on the medical claim (many will these days when they are medically necessary procedures), or you can use the code below and include narrative report to describe the procedure:
41899 - Unlisted procedure, dentoalveolar structures


Hope this helps!