ICD-10 Code D49.4 – Neoplasm of unspecified behavior of bladder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D49.4 – Neoplasm of unspecified behavior of bladder
What it is
D49.4 is used when the bladder has a neoplasm whose behavior is not clearly documented as benign or malignant. It signals an abnormal growth in the bladder, but the final biologic behavior is unspecified.
Clinical signs
Clinical features vary; refer to documentation. Common workups may note hematuria, irritative urinary symptoms, or a bladder mass on cystoscopy or imaging, but the record must support an unspecified neoplastic process.
When to use this code
Use this code when the provider documents a bladder neoplasm but does not identify it as benign, malignant, in situ, or uncertain behavior. It may apply when pathology is pending or the note states “neoplasm of unspecified behavior.”
Do not use it simply because the diagnosis is incomplete. Check documentation for the exact site and behavior, and code a more specific neoplasm category if the record supports one.
Do not use for
Do not use D49.4 for confirmed malignant bladder tumors, benign bladder tumors, or carcinoma in situ. Check documentation if the record instead describes cystitis, polyp, or another non-neoplastic bladder condition.
Coding tip
Verify that both bladder location and unspecified behavior are documented before assigning D49.4.