ICD-10 Code D01 – Carcinoma in situ of other and unspecified digestive organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D01 – Carcinoma in situ of other and unspecified digestive organs
What it is
D01 is used for carcinoma in situ, meaning abnormal cells are present in digestive organs but have not invaded deeper tissue. It covers other or unspecified digestive sites when the exact organ is not separately coded.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on pathology showing in situ malignant change without invasion beyond the epithelium.
When to use this code
Use D01 when the provider documents carcinoma in situ of a digestive organ that is not named in a more specific code. It is appropriate when the report confirms the lesion is noninvasive and located in the digestive system. Check documentation if the site is unclear or if invasion is described.
Do not use for
Do not use D01 for invasive malignant neoplasms, dysplasia without carcinoma in situ, or benign digestive lesions. If the record names a specific digestive site with a more precise code, use that code instead.
Coding tip
Verify the exact anatomic site and whether the pathology says “in situ” before assigning D01.