Endometrial intraepithelial neoplasia [EIN]

This code identifies a precancerous condition of the uterine lining (endometrium) characterized by abnormal glandular proliferation and cellular atypia. It represents a precursor lesion with a high risk of progressing to endometrial adenocarcinoma if left untreated.

Assign this code when pathology reports confirm the diagnosis of endometrial intraepithelial neoplasia (EIN). This diagnosis is typically made following endometrial biopsy or curettage performed due to abnormal uterine bleeding or other suspicious findings.

• Do not code this with C54.1 (Malignant neoplasm of endometrium) as EIN is a precancerous condition, not a malignancy.
• Ensure the pathology report explicitly states "endometrial intraepithelial neoplasia" or "EIN."
• Consider additional codes for symptoms (e.g., abnormal uterine bleeding) if documented and not integral to the EIN diagnosis.