ICD-10 Code C23 – Malignant neoplasm of gallbladder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C23 – Malignant neoplasm of gallbladder
What it is
C23 identifies a malignant tumor arising in the gallbladder. Use it when documentation states gallbladder cancer or malignant neoplasm of the gallbladder.
Clinical signs
Clinical features vary; refer to documentation. Patients may have right upper quadrant pain, jaundice, weight loss, or an incidental gallbladder mass found on imaging or pathology.
When to use this code
Use C23 when the provider documents primary gallbladder malignancy, including a confirmed cancer diagnosis on pathology or imaging-supported clinical assessment. Code it for encounters focused on the neoplasm itself, staging, surveillance, or related evaluation.
If the record only says abnormal gallbladder imaging or suspected cancer, do not assign C23 without confirmation. Check documentation for the exact site and whether the malignancy is primary or metastatic.
Do not use for
Do not use C23 for benign gallbladder disease, gallstones, or cholecystitis. It is also incorrect for secondary malignant neoplasm involving the gallbladder unless documentation confirms a primary gallbladder cancer.
Coding tip
Verify whether the cancer is primary gallbladder or another biliary site before coding.