2027 ICD-10-CM Diagnosis Code K91.0Vomiting following gastrointestinal surgery

ICD-10-CM Codes›K00–K95›K90-K95›K91

ICD-10-CM K91.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K91.0 is a billable ICD-10-CM diagnosis code for vomiting following gastrointestinal surgery. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 391 through 392. Coders also document this condition as bilious vomiting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nausea and vomiting and Postprocedural or postoperative digestive system complication.

Code Identity

ICD-10-CM Code
K91.0
Billable Status
Yes — Valid for Submission
Code Describes
Vomiting following gastrointestinal surgery
Short Description
Vomiting following gastrointestinal surgery
Same as the full description in the CMS dataset.
Parent Code
K91
Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK90-K95Other diseases of the digestive system
CategoryK91Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified
This CodeK91.0Vomiting following gastrointestinal surgery

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilious vomiting
  • Bilious vomiting following gastrointestinal surgery
  • Diarrhea after gastrointestinal tract surgery
  • Diarrhea and vomiting after gastrointestinal tract surgery
  • Postoperative vomiting
  • Vomiting after gastrointestinal tract surgery

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K91.0: its own notes plus those printed at K91 and Chapter 11. A note printed at a category, block or chapter applies to every code under it.

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 K91 Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified applies to 24 codes
  • 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)
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 K91.0, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming K91.0: they are not reported together with it, unless the two conditions are unrelated.

  • R11 Nausea and vomiting
    vomiting following gastrointestinal surgery (K91.0)

Excludes2 1

These codes carry an Excludes2 note naming K91.0: its condition is not part of those codes, and both may be reported when the patient has both.

  • T81 Complications of procedures, not elsewhere classified
    intraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-) names K91.-, 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 SYM004
Nausea and vomiting
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG024
Postprocedural or postoperative digestive system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

After Surgery

After any operation, you'll have some side effects. There is usually some pain with surgery. There may also be swelling and soreness around the area that the surgeon cut. Your surgeon can tell you which side effects to expect.

Read the full article at MedlinePlus

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

Convert K91.0 to ICD-9-CMHistory

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

ICD-9-CM
564.3 Vomiting post-gi surgery
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K91.0Overview

What is the ICD-10 code for vomiting following gastrointestinal surgery?

The ICD-10-CM code for vomiting following gastrointestinal surgery is K91.0 (sometimes written as K910). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is K91.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report vomiting following gastrointestinal surgery on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does K91.0 group to?

When vomiting following gastrointestinal surgery is the principal diagnosis on an inpatient stay, it groups to MS-DRG 392, 391, with relative weights from 0.7645 to 1.2389 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K91.0?

Under the General Equivalence Mappings, vomiting following gastrointestinal surgery converts to ICD-9-CM 564.3 (vomiting post-gi surgery). The mapping is a direct match.