ICD-10 Code D01.49 – Carcinoma in situ of other parts of intestine (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D01.49 – Carcinoma in situ of other parts of intestine
What it is
This code identifies a noninvasive epithelial cancer confined to the lining of other specified intestinal sites. It means malignant cells are present, but there is no documented invasion beyond the mucosa.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on pathology showing carcinoma in situ in an intestinal site other than the colon or rectum.
When to use this code
Use this code when the provider documents carcinoma in situ involving an intestinal location not covered by a more specific site code. Apply it after pathology or operative findings clearly identify the lesion as in situ. If the record only says “intestinal neoplasm” or the site is unclear, check documentation.
Do not use for
Do not use this code for invasive intestinal cancer, benign polyps, or dysplasia without a carcinoma in situ diagnosis. If the anatomic site is better described by another ICD-10-CM code, code that specific site instead.
Coding tip
Confirm both the in situ status and the exact intestinal site before assigning D01.49.