ICD-10 Code I78.1 – Nevus, non-neoplastic (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I78.1 – Nevus, non-neoplastic
What it is
I78.1 is used for a non-neoplastic nevus, meaning a benign skin lesion that is not a true tumor. It identifies a pigmented or vascular mark documented by the clinician as non-cancerous.
Clinical signs
Clinical features vary; refer to documentation. These lesions are typically described as stable, well-defined skin marks that are present on exam and not behaving like malignancy.
When to use this code
Use this code when the record specifically identifies a nevus as non-neoplastic and the finding is being coded as the diagnosis. It may apply to an incidental skin lesion, a long-standing birthmark, or another benign nevus documented by the provider. Check documentation if the lesion type is unclear.
Do not use for
Do not use I78.1 for malignant skin lesions, atypical nevi with a different documented diagnosis, or lesions not identified as non-neoplastic. If the chart only says “skin lesion,” check documentation.
Coding tip
Code from the provider’s exact wording and confirm whether the nevus is documented as benign, non-neoplastic, or another specific lesion type.