E87.8 Other disorders of electrolyte and fluid balance, not elsewhere classified

The ICD-10-CM code for Other disorders of electrolyte and fluid balance, not elsewhere classified is E87.8 (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 E87.8:

• Hyperchloremia
• Hyperelectrolytemia
• Hypochloremia
• Electrolyte imbalance
• Findings, abnormal, inconclusive, without diagnosis › bicarbonate
• Disorder (of) › electrolyte (balance) NEC
• Disorder (of) › fluid balance
• Disturbance (s) › acid-base equilibrium

Inclusion Terms

• Electrolyte imbalance NOS
• Hyperchloremia
• Hypochloremia

U.S. Hospital Utilization

• An estimated 283,075 U.S. inpatient stays in 2023 included E87.8 among the documented diagnoses.
• 785 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)