You are able to bill CDT codes to medical insurance for cleft palate treatment, but CDT codes are not typically the preferred codes for billing medical insurance, especially for surgical procedures. CDT codes may be used for orthodontic treatment, prosthodontic appliances (like palatal obturators, etc), and adjunctive dental services like x-rays and evaluations, but for any surgical procedures, CPT and ICD-10 CM codes are preferred by medical insurances. I would highly suggest a pre auth submission.