ICD-10 Code C79.1 – Secondary malignant neoplasm of bladder and other and unspecified urinary organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C79.1 – Secondary malignant neoplasm of bladder and other and unspecified urinary organs
What it is
This code identifies metastatic cancer that has spread to the bladder or another urinary organ from a primary tumor elsewhere. Use it when the record documents secondary malignant involvement of the urinary tract.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include hematuria, urinary irritation, obstruction, or imaging and pathology showing metastatic tumor in the bladder or urinary organs.
When to use this code
Use C79.1 when the provider states the bladder or a specified urinary organ contains secondary malignant disease. It may follow biopsy, cystoscopy, imaging, or operative findings that confirm metastatic spread. Code the primary malignancy separately when documented.
Do not use for
Do not use this code for primary bladder cancer or benign urinary lesions. Do not assign it when documentation only says “urinary symptoms” or “mass” without confirming metastatic disease; check documentation.
Coding tip
Verify the site is secondary and not the original cancer, and link the code to the documented primary malignancy when available.