ICD-10 Code D02.1 – Carcinoma in situ of trachea (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D02.1 – Carcinoma in situ of trachea
What it is
D02.1 identifies carcinoma in situ of the trachea, meaning abnormal cells are confined to the tracheal lining and have not invaded deeper tissue. Use this code when documentation clearly states in situ disease of the trachea.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is typically based on pathology or endoscopic findings showing malignant cells limited to the epithelium without invasion.
When to use this code
Use D02.1 when the provider documents carcinoma in situ, intraepithelial carcinoma, or equivalent wording for the trachea. It may also fit after biopsy or resection confirms noninvasive tracheal malignancy. If the site is unclear or the record is nonspecific, check documentation before coding.
Do not use for
Do not use D02.1 for invasive tracheal cancer, benign tracheal lesions, or metastatic disease to the trachea. If the pathology shows invasion beyond the epithelium, this code is not appropriate.
Coding tip
Verify both the anatomic site and the “in situ” wording in the pathology or provider note before assigning D02.1.