ICD-10 Code E10.42 – Type 1 diabetes mellitus with diabetic polyneuropathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E10.42 – Type 1 diabetes mellitus with diabetic polyneuropathy
What it is
This code identifies type 1 diabetes complicated by diabetic polyneuropathy, a nerve disorder caused by diabetes. Use it when the record clearly links the neuropathy to the patient’s type 1 diabetes.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include numbness, tingling, burning pain, reduced sensation, or distal symmetric neuropathic symptoms in the feet or hands.
When to use this code
Use E10.42 when the provider documents type 1 diabetes and diabetic polyneuropathy together. It also applies when the neuropathy is described as diabetic, peripheral diabetic neuropathy, or diabetic nerve damage attributable to type 1 diabetes.
If the record mentions neuropathy without a diabetic link, check documentation before coding this combination. You should code the diabetes and neuropathy separately only when the documentation supports a different cause.
Do not use for
Do not use this code for type 2 diabetes, unspecified diabetes, or neuropathy not documented as diabetic. Check documentation if the note only says peripheral neuropathy.
Coding tip
Verify that the provider connects the neuropathy to type 1 diabetes; do not assume the relationship from the problem list alone.