ICD-10 Code D37.01 – Neoplasm of uncertain behavior of lip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D37.01 – Neoplasm of uncertain behavior of lip
What it is
D37.01 identifies a lip neoplasm whose behavior is uncertain, meaning the provider cannot determine whether it is benign or malignant from the available information. Use it for a lesion documented as uncertain behavior of the lip.
Clinical signs
Clinical features vary; refer to documentation. The lesion may be described as a lip mass, nodule, plaque, or other abnormal growth, but the key point is the provider’s uncertainty about its biologic behavior.
When to use this code
Use D37.01 when the record specifically states uncertain behavior of the lip, or when pathology and clinical notes support an indeterminate neoplasm at that site. It is appropriate when the diagnosis is not yet confirmed as benign or malignant. Check documentation if the site or behavior is unclear.
Do not use for
Do not use this code for clearly benign lip lesions, malignant lip neoplasms, or inflammatory or traumatic lip conditions. If the provider documents a different site or a definite behavior, code that diagnosis instead.
Coding tip
Assign the code only when uncertain behavior is explicitly documented; otherwise, query the provider or review pathology for clarification.