Ammann's diagnostic criteria for chronic pancreatitis were published with the 1997 Zurich international workshop on chronic pancreatitis.

1) Recurrent pancreatitis and
2) ≥1 of the following:

• Calcifications in the pancreas
• Moderate or severe ductal lesions as defined by the Cambridge criteria
• Typical pancreatic histology of an adequate surgical specimen
• Persistent exocrine insufficiency (for ≥2 years)