ICD-10 Code D02.3 – Carcinoma in situ of other parts of respiratory system (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D02.3 – Carcinoma in situ of other parts of respiratory system
What it is
This code identifies a noninvasive malignant epithelial lesion in other specified respiratory sites. The abnormal cells are confined to the epithelium and have not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is typically based on pathology showing carcinoma in situ in a respiratory site not otherwise classified under a more specific code.
When to use this code
Use D02.3 when the record documents carcinoma in situ involving an “other” respiratory location, such as a site outside the more specific trachea, bronchus, or lung categories. Code only when the provider clearly identifies the lesion as in situ and the site supports this category.
If the documentation is vague about the exact respiratory site, check documentation before assigning this code. You should also verify that the lesion is not described as invasive or as a different respiratory neoplasm.
Do not use for
Do not use this code for invasive respiratory cancers or for carcinoma in situ of a more specific site with its own code. Do not guess the site if the chart does not support it.
Coding tip
Match the pathology report and site wording carefully; if the respiratory location is not specific, check documentation before coding D02.3.