ICD-10 Code D00.2 – Carcinoma in situ of stomach (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D00.2 – Carcinoma in situ of stomach
What it is
D00.2 identifies carcinoma in situ of the stomach, a very early neoplastic change confined to the gastric lining. It means abnormal cells are present but have not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. This diagnosis is usually based on endoscopic or pathologic findings showing in situ malignant change in the stomach without evidence of invasion.
When to use this code
Use D00.2 when the provider documents carcinoma in situ of the stomach, gastric intraepithelial neoplasia, or an equivalent noninvasive malignant lesion. Code it when pathology or clinical documentation clearly supports a stomach primary. If the record only says suspicious, dysplasia, or uncertain behavior, check documentation before assigning this code.
Do not use for
Do not use D00.2 for invasive stomach cancer or for benign gastric polyps and ulcers. Do not assume it applies to dysplasia unless the provider specifically documents carcinoma in situ.
Coding tip
Link the code to the exact anatomic site and pathology wording; when terminology is unclear, query the provider.