K85.00 Idiopathic acute pancreatitis without necrosis or infection

The ICD-10-CM code for Idiopathic acute pancreatitis without necrosis or infection is K85.00 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K80-K87: Disorders of gallbladder, biliary tract and pancreas (K80-K87)

Category K85

25 codes (18 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K85.00:

• Pancreatitis (annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative) › acute (without necrosis or infection) › idiopathic (without necrosis or infection)

U.S. Hospital Utilization

• An estimated 12,075 U.S. inpatient stays in 2023 included K85.00 among the documented diagnoses.
• 9,655 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)