ICD-10 Code K83.5 – Biliary cyst (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K83.5 – Biliary cyst
What it is
K83.5 identifies a cystic lesion of the bile ducts or biliary tree. Use it when documentation specifically describes a biliary cyst rather than a broader biliary obstruction or liver mass.
Clinical signs
Clinical features vary; refer to documentation. Patients may have abdominal pain, jaundice, or an incidental imaging finding showing a cystic biliary structure.
When to use this code
Use K83.5 when the provider documents a biliary cyst, choledochal cyst, or similar cystic biliary abnormality. It is appropriate when imaging, operative notes, or specialist assessment clearly identifies the lesion. If the record is nonspecific, check documentation before coding.
Do not use for
Do not use this code for gallstones, biliary obstruction, or simple liver cysts unless the bile ducts are specifically involved. Avoid assigning it when the chart only says “cyst” without biliary location.
Coding tip
Confirm the anatomic site in the report; the word “biliary” must be documented or clearly implied.