AHA Coding Clinic® for ICD-9 - 2009 Issue 4; VOLUMES 1 & 2 NEW/REVISED CODES

Endometrial Intraepithelial Neoplasia

Effective October 1, 2009, code 621.3 has been expanded to uniquely report benign endometrial hyperplasia (621.34) and endometrial intraepithelial neoplasia [EIN] (621.35). Recent studies have shown that genuine premalignant lesions are mutation-bearing monoclonal neoplasms, and computerized image analysis has defined new histologic features for their accurate diagnosis. Pathologists and gynecologists are increasingly using a practically oriented disease classification that distinguishes the benign hormonal effects of unopposed estrogens (benign hyperplasia) from emergent precancerous lesions (endometrial intraepithelial neoplasia [EIN]) through the use of non-overlapping terminology and discrete criteria. The separation of largely polyclonal proliferations that result from a...

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