I know this is a rather old thread, but when there are coding changes, I like to update old threads since many people may reference them, not realizing the information is currently inaccurate. As of 01/01/2024 there is FINALLY a code (actually 2) for HIPEC.
96547 Intraoperative hyperthermic intraperitoneal chemotherapy (HIPEC) procedure, including separate incision(s) and closure, when performed; first 60 minutes (List separately in addition to code for primary procedure)
96548 Intraoperative hyperthermic intraperitoneal chemotherapy (HIPEC) procedure, including separate incision(s) and closure, when performed; each additional 30 minutes (List separately in addition to code for primary procedure)
Currently, there are no RVUs attached and pricing is per MAC, which should be interesting!