The G8399 CPT (Current Procedural Terminology) code is a medical code used by physicians for billing purposes, primarily related to the treatment of patients with chronic heart failure. It indicates that the patient’s condition is being managed by a healthcare provider who meets the specific criteria set forth by the National Quality Strategy Domain. This might involve a healthcare provider’s comprehensive written care plan or instructions for the home care environment. Please consult a healthcare professional or coding specialist for further information, as CPT codes are complex and require specific knowledge to interpret correctly.