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ICD-10-CM 2027 diagnosis code

K90.89Other intestinal malabsorption

✓ Billable / specificCC — complication/comorbidity

K90.89 is a valid, billable ICD-10-CM code for other intestinal malabsorption. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K90.89

K90.89 is the ICD-10-CM diagnosis code for other intestinal malabsorption. It belongs to category K90 (intestinal malabsorption), block K90-K95 (other diseases of the digestive system) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within K90.8, choose K90.89 (Other intestinal malabsorption) only when documentation doesn't support a more specific option: Whipple's disease (K90.81), short bowel syndrome (K90.82) and intestinal failure (K90.83).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 579.8 (other specified intestinal malabsorption).

Notes that apply from higher levels

Instructions written at a parent level also apply to K90.89.

› From K90 Intestinal malabsorption
Excludes1
  • intestinal malabsorption following gastrointestinal surgery (K91.2)

Broader instructions also apply from Chapter 11: Diseases of the digestive system.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to K90.89.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 579.8Other specified intestinal malabsorptionapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about K90.89

Is K90.89 billable?

Yes. K90.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can K90.89 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict K90.89 as a principal diagnosis.

Is K90.89 a CC or MCC?

K90.89 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does K90.89 group to?

K90.89 is used in the MS-DRG v44.0 logic for MS-DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC) and MS-DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for K90.89?

The CMS General Equivalence Mappings map K90.89 to ICD-9-CM 579.8.