ICD-10 Code D02.21 – Carcinoma in situ of right bronchus and lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D02.21 – Carcinoma in situ of right bronchus and lung
What it is
D02.21 identifies carcinoma in situ confined to the right bronchus or lung. The abnormal cells are present, but there is no documented invasion into surrounding tissue.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is typically based on pathology or endoscopic findings showing in situ malignant change limited to the right bronchus or lung.
When to use this code
Use this code when the record specifically states carcinoma in situ of the right bronchus or lung. It also fits when pathology confirms a noninvasive lesion in that right-sided respiratory site. If laterality or site is unclear, check documentation before assigning the code.
Do not use for
Do not use D02.21 for invasive lung cancer, metastatic disease, or lesions documented only as suspicious or possible. Check documentation if the site is left-sided or unspecified.
Coding tip
Match the code to both histology and laterality; do not assume right-sided disease unless the record says so.