Pers hx of in-situ neoplm of oral cavity, esoph and stomach

This code signifies a patient's past diagnosis of a non-invasive, localized neoplasm (carcinoma in situ) that originated in the oral cavity, esophagus, or stomach. It indicates that the abnormal cells were confined to the epithelial layer and had not spread to surrounding tissues at the time of diagnosis and treatment.

Apply this code when documenting a patient's medical history following successful treatment (e.g., surgical excision, endoscopic resection) of carcinoma in situ in any of these specified anatomical sites. It is used for surveillance visits or when the history of this condition is relevant to current care, even if the patient is considered cured.

• Do not use this code for current or active neoplasms; use the appropriate C-code for active malignancy.
• Ensure documentation clearly specifies "in situ" and the anatomical site (oral cavity, esophagus, or stomach).
• This code is typically a secondary diagnosis, supporting the medical necessity of follow-up care or screening.