Medical Coding ICD-10 Combo Codes Explained (with examples!) In this video, we break down how ICD-10-CM combination codes work and when to use them. A combo code lets you report related conditions (or a condition with its manifestation or complication) using one code instead of multiple codes, helping you code more accurately and reduce claim denials. We cover common examples such as diabetes with complications, hypertensive heart and kidney disease, asthma with status asthmaticus, and Parkinson