Neoplasm of uncertain behavior of uterus

This code signifies a uterine growth where the pathologist cannot definitively determine if it is benign or malignant after microscopic examination. It indicates that the cellular characteristics are ambiguous, falling between clearly benign and clearly cancerous.

Apply this code when pathology reports describe a uterine neoplasm as "uncertain behavior," "borderline," "atypical proliferation of uncertain significance," or similar terminology. This is typically used after a biopsy or surgical excision when further definitive classification is pending or not possible.

• Do not use this code if the pathology report clearly states benign (e.g., leiomyoma) or malignant (e.g., adenocarcinoma).
• Review the full pathology report carefully; the final diagnosis may supersede an initial "uncertain" finding.
• Consider sequencing this code as the primary diagnosis if it is the reason for the encounter, especially for follow-up or further diagnostic workup.