Carcinoma in situ of bladder

This code signifies the presence of non-invasive malignant cells confined to the urothelial lining of the bladder, without invasion through the basement membrane. It represents the earliest stage of bladder cancer, where the abnormal cells have not spread to deeper tissues.

Apply this code when documentation explicitly states "carcinoma in situ of bladder" or "CIS of bladder." This diagnosis is typically confirmed by biopsy and subsequent histopathological examination. It is appropriate for initial diagnosis and follow-up encounters where CIS is the primary finding.

• Differentiate from invasive bladder carcinoma; this code is strictly for non-invasive disease.
• Do not use for dysplasia or atypical hyperplasia, which are precancerous but not malignant in situ.
• Consider sequencing with codes for any associated symptoms or procedures, but CIS should be primary if it's the reason for the encounter.