E87.21 Acute metabolic acidosis

The ICD-10-CM code for Acute metabolic acidosis is E87.21 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

4: Endocrine, nutritional and metabolic diseases (E00-E89)

Section

E70-E88: Metabolic disorders (E70-E88)

Category E87

17 codes (14 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to E87.21:

• Acidosis (lactic) › metabolic NEC › acute
• Acidosis (lactic) › lactic › acute
• Disorder (of) › electrolyte (balance) NEC › acidosis (lactic) (metabolic) › acute

Inclusion Terms

• Acute lactic acidosis

U.S. Hospital Utilization

• An estimated 156,325 U.S. inpatient stays in 2023 included E87.21 among the documented diagnoses.
• 1,215 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

Diabetes mellitus (TOC entry)

a. Diabetes mellitus ................................................................................................................... 39

Obesity (TOC entry)

b. Obesity .................................................................................................................................. 42

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)