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ICD-10-CM 2027 diagnosis code

K91.2Postsurgical malabsorption, not elsewhere classified

✓ Billable / specificCC — complication/comorbidity

K91.2 is a valid, billable ICD-10-CM code for postsurgical malabsorption, not elsewhere classified. 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 K91.2

K91.2 is the ICD-10-CM diagnosis code for postsurgical malabsorption, not elsewhere classified. It belongs to category K91 (intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified), 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 K91 (intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified), K91.2 is specifically for postsurgical malabsorption, not elsewhere classified. Related codes cover vomiting following gastrointestinal surgery (K91.0), Postgastric surgery syndromes (K91.1), postprocedural intestinal obstruction (K91.3), Postcholecystectomy syndrome (K91.5), intraoperative hemorrhage and hematoma of a digestive system organ or structure complicating a procedure (K91.6), accidental puncture and laceration of a digestive system organ or structure during a procedure (K91.7) and other intraoperative and postprocedural complications and disorders of digestive system (K91.8).

Don't report K91.2 together with the conditions in its Excludes1 note: malabsorption osteomalacia in adults (M83.2) and malabsorption osteoporosis, postsurgical (M80.8-, M81.8).

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), DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 06 (Diseases and Disorders of the Digestive System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), 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 579.3 (other and unspecified postsurgical nonabsorption).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Postsurgical blind loop syndrome
Excludes1Not coded here — never report together with this code
  • malabsorption osteomalacia in adults (M83.2)
  • malabsorption osteoporosis, postsurgical (M80.8-, M81.8)

Notes that apply from higher levels

Instructions written at a parent level also apply to K91.2.

› From K91 Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified
Excludes2
  • complications of artificial opening of digestive system (K94.-)
  • complications of bariatric procedures (K95.-)
  • gastrojejunal ulcer (K28.-)
  • postprocedural (radiation) retroperitoneal abscess (K68.11)
  • radiation colitis (K52.0)
  • radiation gastroenteritis (K52.0)
  • radiation proctitis (K62.7)

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

Alphabetic index entries

10 entries

Terms in the official ICD-10-CM index that lead to K91.2.

Codes whose notes reference K91.2

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.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 579.3Other and unspecified postsurgical nonabsorptionexact

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 K91.2

Is K91.2 billable?

Yes. K91.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can K91.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict K91.2 as a principal diagnosis.

Is K91.2 a CC or MCC?

K91.2 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does K91.2 group to?

K91.2 is used in the MS-DRG v44.0 logic for MS-DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC), MS-DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC), MS-DRG 791 (Prematurity with Major Problems) and MS-DRG 793 (Full Term Neonate with Major Problems). 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 K91.2?

The CMS General Equivalence Mappings map K91.2 to ICD-9-CM 579.3.