ICD-10 Code C45.7 – Mesothelioma of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C45.7 – Mesothelioma of other sites
What it is
C45.7 identifies mesothelioma arising in sites other than the pleura, peritoneum, pericardium, or tunica vaginalis. Use it when the record specifies another anatomic location and documentation supports malignant mesothelial disease.
Clinical signs
Clinical features vary; refer to documentation. Findings usually reflect the involved site, and diagnosis is typically confirmed by pathology or other specialist evaluation.
When to use this code
Use C45.7 when the provider documents mesothelioma in an uncommon or unspecified “other site,” such as a location not named in the more specific mesothelioma codes. It may also apply when pathology confirms mesothelioma but the chart clearly identifies a nonstandard anatomic site. If the site is unclear, check documentation before assigning this code.
Do not use for
Do not use this code for pleural, peritoneal, pericardial, or tunica vaginalis mesothelioma. Also avoid it when the record describes a different malignancy or the site is not documented.
Coding tip
Match the code to the exact anatomic site stated in the pathology or provider note; if the location is vague, query for clarification.