2026 ICD-10-CM Diagnosis Code K85.90Acute pancreatitis without necrosis or infection, unspecified

ICD-10-CM Codes›K00–K95›K80-K87›K85

ICD-10-CM K85.90
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K85.90 is a billable ICD-10-CM diagnosis code for acute pancreatitis without necrosis or infection, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 438 through 440. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pancreatic disorders (excluding diabetes).

Code Identity

ICD-10-CM Code
K85.90
Billable Status
Yes — Valid for Submission
Code Describes
Acute pancreatitis without necrosis or infection, unspecified
Short Description
Acute pancreatitis without necrosis or infection, unsp
Parent Code
K85.9
Acute pancreatitis, unspecified

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK85Acute pancreatitis
This CodeK85.90Acute pancreatitis without necrosis or infection, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute hemorrhagic pancreatitis
  • Acute pancreatitis
  • Acute recurrent pancreatitis
  • Anemia of endocrine disorder
  • Aplastic anemia associated with pancreatitis
  • Apoplectic pancreatitis
  • Follicular cholangitis and pancreatitis
  • Hemorrhage of pancreas
  • Ischemic pancreatitis
  • Painless pancreatitis
  • Pancreatic collection
  • Pancreatitis
  • Pancreatitis due to pancreatic duct obstruction
  • Pancytopenia with pancreatitis
  • Phlegmon of pancreas
  • Pleural effusion due to another disorder
  • Pleural effusion due to disorder of pancreas
  • Pleural effusion due to pancreatitis
  • Post-ERCP acute pancreatitis
  • Pseudocyst of pancreas
  • Pseudocyst of pancreas due to acute pancreatitis
  • Recurrent pancreatitis
  • Secondary aplastic anemia
  • Subacute pancreatitis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

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

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG020
Pancreatic disorders (excluding diabetes)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Autoimmune Pancreatitis

    chronic pancreatitis associated with autoimmune diseases.

  • Pancreatitis

    inflammation of the pancreas. pancreatitis is classified as acute unless there are computed tomographic or endoscopic retrograde cholangiopancreatographic findings of chronic pancreatitis (international symposium on acute pancreatitis, atlanta, 1992). the two most common forms of acute pancreatitis are alcoholic pancreatitis and gallstone pancreatitis.

  • Pancreatitis, Acute Hemorrhagic

    an acute inflammation of the pancreas in which the initial edematous pancreatitis evolved into necrosis accompanied by hemorrhage.

  • Pancreatitis, Acute Necrotizing

    a severe form of acute inflammation of the pancreas characterized by one or more areas of necrosis in the pancreas with varying degree of involvement of the surrounding tissues or organ systems. massive pancreatic necrosis may lead to diabetes mellitus, and malabsorption.

  • Pancreatitis, Alcoholic

    acute or chronic inflammation of the pancreas due to excessive alcohol drinking. alcoholic pancreatitis usually presents as an acute episode but it is a chronic progressive disease in alcoholics.

  • Pancreatitis, Chronic

    inflammation of the pancreas that is characterized by recurring or persistent abdominal pain with or without steatorrhea or diabetes mellitus. it is characterized by the irregular destruction of the pancreatic parenchyma which may be focal, segmental, or diffuse.

  • Pancreatitis, Graft

    an inflammatory disease and serious complication of pancreas transplantation. it is caused by a premature activation of pancreatic proenzymes leading to autodigestion of the gland and can be attributed to immunological or nonimmunological causes.

  • Pancreatitis-Associated Proteins

    c-type lectins that restrict growth of bacteria in the intestinal epithelia and have bactericidal activity against gram-positive and gram-negative bacteria. they also regulate proliferation and differentiation of keratinocytes following injury. human pancreatitis-associated protein-1 (reg3a) is overexpressed by pancreatic acinar cells in patients with chronic pancreatitis. it is also highly expressed by pancreatic, bladder, and gastrointestinal cancer cells and may serve as a diagnostic biomarker.

  • Pancreas Transplantation

    the transference of a pancreas from one human or animal to another.

Patient EducationClinical

Pancreatitis

The pancreas is a large gland behind the stomach and close to the first part of the small intestine. It secretes digestive juices into the small intestine through a tube called the pancreatic duct. The pancreas also releases the hormones insulin and glucagon into the bloodstream.

Read the full article at MedlinePlus

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Convert K85.90 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
577.0 Acute pancreatitis
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement K85.90 replaces the following previously assigned code(s):

  • K85.9 - Acute pancreatitis, unspecified
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K85.90Overview

Is K85.90 (Acute pancreatitis, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute pancreatitis without necrosis or infection, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K85.90 group to?

When acute pancreatitis without necrosis or infection, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 438, 439, 440, with relative weights from 0.6214 to 1.6302 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K85.90?

Under the General Equivalence Mappings, acute pancreatitis without necrosis or infection, unspecified converts to ICD-9-CM 577.0 (acute pancreatitis). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.