2027 ICD-10-CM Diagnosis Code K85.90Acute pancreatitis without necrosis or infection, unspecified
ICD-10-CM Codes›K00–K95›K80-K87›K85
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Not Chronic
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 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pancreatic disorders (excluding diabetes).
Code Identity
Code Classification
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
- Subacute pancreatitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K85.90: 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.
- 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.
- 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 K85.90, its category, or a range that includes it.
Code First 1
These codes say to code first a condition named in the note, and K85.90 is one of the conditions named.
- E08 Diabetes mellitus due to underlying condition
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.
Clinical InformationClinical
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.
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 K85.90 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replacement K85.90 replaces the following previously assigned code(s):
- K85.9 - Acute pancreatitis, unspecified
Questions About K85.90Overview
What is the ICD-10 code for acute pancreatitis without necrosis or infection, unspecified?
The ICD-10-CM code for acute pancreatitis without necrosis or infection, unspecified is K85.90 (sometimes written as K8590). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 793, 791, 440, 438, 439, with relative weights from 0.5966 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K85.90 a CC or MCC?
CMS lists K85.90 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 K85.90?
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.
