K31.83 Achlorhydria

The ICD-10-CM code for Achlorhydria is K31.83 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

K20-K31: Diseases of esophagus, stomach and duodenum (K20-K31)

Category K31

31 codes (25 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K31.83:

• Achlorhydria, achlorhydric (neurogenic)
• Anacidity, gastric
• Achlorhydria, achlorhydric (neurogenic) › diarrhea
• Diarrhea, diarrheal (disease) (infantile) (inflammatory) › achlorhydric

U.S. Hospital Utilization

• An estimated 70 U.S. inpatient stays in 2022 included K31.83 among the documented diagnoses.

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)

Cite This Page

Reference K31.83 with the canonical source and edition:

K31.83 — Achlorhydria. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/K31.83

Canonical URL: https://icd10codingpro.com/codes/K31.83