ICD-10 Code E08.40 – Diabetes mellitus due to underlying condition with diabetic neuropathy, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E08.40 – Diabetes mellitus due to underlying condition with diabetic neuropathy, unspecified
What it is
This code identifies diabetes caused by another underlying condition, along with diabetic neuropathy that is not further specified. Use it when the record links the diabetes to a separate disease and documents neuropathy as a complication.
Clinical signs
Clinical features vary; refer to documentation. Neuropathy may be described as numbness, tingling, burning pain, reduced sensation, or diminished reflexes in the extremities.
When to use this code
Use E08.40 when the provider documents diabetes due to an underlying condition and also documents diabetic neuropathy, but does not name the neuropathy type. This applies when the record clearly connects the neuropathy to the diabetes. Check documentation if the underlying condition or complication is unclear.
Do not use for
Do not use this code for diabetes without neuropathy, or for neuropathy not documented as diabetic. If the neuropathy type is specified, choose the more precise code. Check documentation.
Coding tip
Assign the underlying-condition diabetes code only when the causal relationship is documented, and code the neuropathy to the highest available specificity.