K91.1 Postgastric surgery syndromes

The ICD-10-CM code for Postgastric surgery syndromes is K91.1 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K90-K95: Other diseases of the digestive system (K90-K95)

Category K91

32 codes (24 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K91.1:

• Postgastrectomy dumping syndrome
• Dumping syndrome (postgastrectomy)
• Diarrhea, diarrheal (disease) (infantile) (inflammatory) › postgastrectomy
• Syndrome › postgastric surgery
• Syndrome › dumping (postgastrectomy)
• Achlorhydria, achlorhydric (neurogenic) › secondary to vagotomy
• Syndrome › postgastrectomy (dumping)
• Diarrhea, diarrheal (disease) (infantile) (inflammatory) › postvagotomy

Inclusion Terms

• Dumping syndrome
• Postgastrectomy syndrome
• Postvagotomy syndrome

U.S. Hospital Utilization

• An estimated 4,025 U.S. inpatient stays in 2023 included K91.1 among the documented diagnoses.
• 385 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)