ICD-10 Code D19 – Benign neoplasm of mesothelial tissue (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D19 – Benign neoplasm of mesothelial tissue
What it is
D19 identifies a noncancerous growth arising from mesothelial tissue, the lining that covers certain body cavities and organs. Use it when documentation clearly states a benign mesothelial neoplasm.
Clinical signs
Clinical features vary; refer to documentation. These lesions may be found on imaging, during surgery, or on pathology when a localized mesothelial mass is identified.
When to use this code
Use D19 when the provider documents a benign neoplasm of mesothelial tissue without naming a more specific site-specific code. It may apply after biopsy or pathology confirms a benign mesothelial tumor. If the record only says “mass” or “lesion,” check documentation before assigning D19.
Do not use for
Do not use this code for malignant mesothelioma or for nonspecific pleural, peritoneal, or pericardial effusions. If the lesion is described as uncertain, metastatic, or inflammatory, check documentation.
Coding tip
Confirm the pathology wording and the anatomic site before coding, because “mesothelial” alone may not be enough for accurate assignment.