2026 ICD-10-CM Diagnosis Code K90.89Other intestinal malabsorption

ICD-10-CM Codes›K00–K95›K90-K95›K90

ICD-10-CM K90.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K90.89 is a billable ICD-10-CM diagnosis code for other intestinal malabsorption. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. Coders also document this condition as chemically-induced malabsorption. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.

Code Identity

ICD-10-CM Code
K90.89
Billable Status
Yes — Valid for Submission
Code Describes
Other intestinal malabsorption
Short Description
Other intestinal malabsorption
Same as the full description in the CMS dataset.
Parent Code
K90.8
Other intestinal malabsorption

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK90-K95Other diseases of the digestive system
CategoryK90Intestinal malabsorption
This CodeK90.89Other intestinal malabsorption

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chemically-induced malabsorption
  • Chronic diarrhea of infants AND/OR young children
  • Congenital malabsorptive diarrhea due to paucity of enteroendocrine cells
  • Disorder of gastrointestinal tract co-occurrent with human immunodeficiency virus infection
  • Gastrointestinal malabsorption syndrome co-occurrent with human immunodeficiency virus infection
  • Intestinal malabsorption with AIDS
  • Malabsorption - iron
  • Malabsorption caused by drug
  • Malabsorption in the elderly

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.

    • Gastropathy
      • exudative
    • Malabsorption
      • calcium
    • Malabsorption
      • intestinal
        • specified NEC

Clinical ClassificationClinical

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

CCSR DIG025
Other specified and unspecified gastrointestinal disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Malabsorption Syndromes

Your small intestine does most of the digesting of the foods you eat. If you have a malabsorption syndrome, your small intestine cannot absorb nutrients from foods.

Read the full article at MedlinePlus

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

Convert K90.89 to ICD-9-CMHistory

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

ICD-9-CM
579.8 Intest malabsorption 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 K90.89Overview

Is K90.89 (Other intestinal malabsorption) a billable code?

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

What MS-DRG does K90.89 group to?

When other intestinal malabsorption is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K90.89?

Under the General Equivalence Mappings, other intestinal malabsorption converts to ICD-9-CM 579.8 (intest malabsorption 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.