2027 ICD-10-CM Diagnosis Code K85.10Biliary acute pancreatitis without necrosis or infection

ICD-10-CM Codes›K00–K95›K80-K87›K85

ICD-10-CM K85.10
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K85.10 is a billable ICD-10-CM diagnosis code for biliary acute pancreatitis without necrosis or infection. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 438 through 440, 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 24 closely related codes. Coders also document this condition as acute pancreatitis due to common bile duct calculus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pancreatic disorders (excluding diabetes).

Code Identity

ICD-10-CM Code
K85.10
Billable Status
Yes — Valid for Submission
Code Describes
Biliary acute pancreatitis without necrosis or infection
Short Description
Biliary acute pancreatitis without necrosis or infection
Same as the full description in the CMS dataset.
Parent Code
K85.1
Biliary acute pancreatitis

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK80-K87Disorders of gallbladder, biliary tract and pancreas
CategoryK85Acute pancreatitis
This CodeK85.10Biliary acute pancreatitis without necrosis or infection

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute pancreatitis due to common bile duct calculus
  • Gallstone acute pancreatitis
  • Gallstone pancreatitis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K85.10: its own notes plus those printed at K85 and Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From K85 Acute pancreatitis applies to 18 codes
  • acute (recurrent) pancreatitis
  • subacute pancreatitis

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name K85.10, its category, or a range that includes it.

Code First 1

These codes say to code first a condition named in the note, and K85.10 is one of the conditions named.

  • E08 Diabetes mellitus due to underlying condition
    pancreatitis and other diseases of the pancreas (K85-K86.-) names K85-K86, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

  • Acute Pancreatitis

    an acute inflammatory process that leads to necrosis of the pancreatic parenchyma. signs and symptoms include severe abdominal pain, nausea, vomiting, diarrhea, fever, and shock. causes include alcohol consumption, presence of gallstones, trauma, and drugs.

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 K85.10 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 K85.10 replaces the following previously assigned code(s):

  • K85.1 - Biliary acute pancreatitis
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K85.10Overview

What is the ICD-10 code for biliary acute pancreatitis without necrosis or infection?

The ICD-10-CM code for biliary acute pancreatitis without necrosis or infection is K85.10 (sometimes written as K8510). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is K85.10 (Biliary acute pancreatitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report biliary acute pancreatitis without necrosis or infection on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does K85.10 group to?

When biliary acute pancreatitis without necrosis or infection is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 440, 438, 439, with relative weights from 0.5966 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Is K85.10 a CC or MCC?

CMS lists K85.10 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 24 closely related codes in its exclusion list.

What is the ICD-9 equivalent of K85.10?

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