2026 ICD-10-CM Diagnosis Code K86.1Other chronic pancreatitis

ICD-10-CM Codes›K00–K95›K80-K87›K86

ICD-10-CM K86.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K86.1 is a billable ICD-10-CM diagnosis code for other chronic pancreatitis. 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
K86.1
Billable Status
Yes — Valid for Submission
Code Describes
Other chronic pancreatitis
Short Description
Other chronic pancreatitis
Same as the full description in the CMS dataset.
Parent Code
K86
Other diseases of pancreas

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK86Other diseases of pancreas
This CodeK86.1Other chronic pancreatitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute on chronic pancreatitis
  • Calcific chronic pancreatitis
  • Chronic fibrosing pancreatitis
  • Chronic infectious pancreatitis
  • Chronic pancreatitis
  • Chronic pancreatitis due to gallbladder calculus
  • Drug-induced chronic pancreatitis
  • Familial chronic pancreatitis
  • Fibrosis of pancreas
  • Groove pancreatitis
  • Hereditary pancreatitis
  • Idiopathic chronic pancreatitis
  • Infectious pancreatitis
  • Interstitial pancreatitis
  • Metabolic pancreatitis
  • Obstructive chronic pancreatitis
  • Pseudocyst of pancreas
  • Pseudocyst of pancreas due to chronic pancreatitis
  • Recurrent pancreatitis
  • Relapsing pancreatitis
  • Tropical calcific chronic pancreatitis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Chronic pancreatitis NOS
  • Infectious chronic pancreatitis
  • Recurrent chronic pancreatitis
  • Relapsing chronic pancreatitis

Code Also

  • exocrine pancreatic insufficiency K86.81

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.

    • Hypertension, hypertensive(accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)
      • pancreatic duct - code to underlying condition
        • with chronic pancreatitis
    • Pancreatitis(annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)
      • chronic (infectious)
    • Pancreatitis(annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)
      • chronic (infectious)
        • recurrent
    • Pancreatitis(annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)
      • chronic (infectious)
        • relapsing
    • Pancreatitis(annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)
      • cystic (chronic)
    • Pancreatitis(annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)
      • fibrous (chronic)
    • Pancreatitis(annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)
      • interstitial (chronic)
    • Pancreatitis(annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)
      • recurrent
        • chronic
    • Pancreatitis(annular) (apoplectic) (calcareous) (edematous) (hemorrhagic) (malignant) (subacute) (suppurative)
      • relapsing, chronic

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

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

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K86.1 to ICD-9-CMHistory

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

ICD-9-CM
577.1 Chronic pancreatitis
Approximate The match is approximate rather than exact.
ICD-9-CM
577.8 Pancreatic disease NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K86.1Overview

Is K86.1 (Other diseases of pancreas) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other chronic pancreatitis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K86.1 group to?

When other chronic pancreatitis 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 K86.1?

Under the General Equivalence Mappings, other chronic pancreatitis converts to ICD-9-CM 577.1 (chronic pancreatitis) and 577.8 (pancreatic disease NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.