ICD-10 Code C74.91 – Malignant neoplasm of unspecified part of right adrenal gland (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C74.91 – Malignant neoplasm of unspecified part of right adrenal gland
What it is
This code identifies a malignant tumor in the right adrenal gland when the exact part of the gland is not specified. Use it for documented primary adrenal cancer on the right side.
Clinical signs
Clinical features vary; refer to documentation. Patients may have an adrenal mass, incidental imaging findings, or symptoms related to local tumor effects or hormone production if noted in the record.
When to use this code
Use C74.91 when the provider documents malignant neoplasm of the right adrenal gland but does not identify cortex, medulla, or another specific site. It also fits when laterality is right and the record supports a primary malignant adrenal tumor.
If the note only says “adrenal cancer” without laterality, check documentation before coding. Do not assume the right side unless it is clearly stated in the medical record.
Do not use for
Do not use this code for benign adrenal masses, metastatic disease to the adrenal gland, or tumors of unspecified laterality. Check documentation when the site is described as the adrenal cortex or medulla.
Coding tip
Verify laterality and whether the tumor is primary before assigning C74.91.