Combination Codes
Assign a combination code only when that code fully identifies the diagnostic conditions involved or when the Alphabetic Index directs.
Don’t use multiple coding when the classification gives a combination code that clearly identifies all elements documented in the diagnosis.
When the combination code lacks necessary specificity in describing the manifestation or complication, use an additional code as a secondary code.
This chart shows examples of combination codes for certain conditions.
| ICD-10-CM Code | Description |
|---|---|
| K57.21 | Diverticulitis of large intestine with perforation and abscess with bleeding |
| E11.3411 | Type 2 diabetes mellitus with severe nonproliferative diabetic retinopathy with macular edema, right eye |
| I25.110 | Atherosclerotic heart disease of native coronary artery with unstable angina pectoris |