ICD-10 Code E10.33 – Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E10.33 – Type 1 diabetes mellitus with moderate nonproliferative diabetic retinopathy
What it is
This code identifies type 1 diabetes mellitus complicated by moderate nonproliferative diabetic retinopathy. It means diabetic retinal damage is present, but the disease has not progressed to proliferative retinopathy.
Clinical signs
Documentation may note retinal hemorrhages, microaneurysms, or other nonproliferative changes consistent with moderate disease. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly links type 1 diabetes with moderate nonproliferative diabetic retinopathy. You should assign it when the provider documents the eye condition as a diabetes-related complication, even if the visit is for another reason.
Check that the retinopathy severity is specifically documented as moderate. If the note only says diabetic retinopathy without severity, you need more detail.
Do not use for
Do not use this code for proliferative diabetic retinopathy, macular edema alone, or retinopathy not stated as diabetes-related. Do not guess the severity if the documentation is unclear.
Coding tip
Confirm both the diabetes type and the retinopathy severity in the provider note before coding.