The following codes can be used when inserting and removing contraceptive implants:
V25.50 Encounter for contraceptive management, insertion of implantable subdermal contraceptive
V25.43 Encounter for contraceptive management, surveillance of previously prescribed contraceptive methods (checking, reinsertion or removal of contraceptive device), implantable subdermal contraceptive.
CPT codes (same for Implanon or Nexplanon):
11981 Insertion, non-biodegradable drug delivery implant
11982 Removal, non-biodegradable drug delivery implant
11983 Removal, with reinsertion, non-biodegradable drug delivery implant
J7307 Etonogestrel (contraceptive) implant system, including implant and supplies.
81025 Pregnancy test