Idiopathic acute pancreatitis without necrosis or infection

This code signifies an acute inflammation of the pancreas that arises spontaneously without an identifiable cause, and importantly, without evidence of tissue death (necrosis) or secondary infection. It represents the initial, non-complicated presentation of acute pancreatitis where the etiology remains unknown after initial workup.

Apply this code when documentation clearly states acute pancreatitis is present, the cause is idiopathic, and imaging or lab results confirm the absence of necrosis or infection. This is appropriate for patients presenting with classic symptoms like severe epigastric pain, elevated pancreatic enzymes, and characteristic imaging findings, but without an obvious trigger like gallstones or alcohol.

• Ensure documentation explicitly states "idiopathic" or "unknown etiology" for acute pancreatitis.
• Do not use if necrosis or infection is documented, even if the underlying cause is unknown; instead, refer to more specific K85 subcategories.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, followed by any associated symptoms or complications.