E13.40

HCC Category Mapping

What This Code Means

A type of diabetes (not type 1 or type 2) causing nerve damage, but the specific type of nerve damage is not specified.

Coding Tips

• •Use this code only when nerve damage is present but the specific type cannot be determined
• •Review documentation to see if a more specific neuropathy code (E13.41, E13.43, E13.44) applies

Clinical Significance

E13.40 identifies diabetic neuropathy, unspecified type, in patients with other specified (secondary) diabetes mellitus. Diabetic neuropathy is one of the most common chronic complications of diabetes, affecting up to 50% of patients, and causes progressive nerve damage leading to pain, numbness, weakness, and functional impairment.

Documentation Requirements

• ✓Documentation must confirm secondary diabetes with its underlying cause and the presence of neuropathy.
• ✓The provider should specify the type of neuropathy (polyneuropathy, mononeuropathy, autonomic) when possible.
• ✓Nerve conduction studies, clinical examination findings, or symptom descriptions support the diagnosis.

Commonly Confused Codes