2026 ICD-10-CM Diagnosis Code E87.8Other disorders of electrolyte and fluid balance, not elsewhere classified

ICD-10-CM Codes›E00–E89›E70-E88›E87

ICD-10-CM E87.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E87.8 is a billable ICD-10-CM diagnosis code for other disorders of electrolyte and fluid balance, not elsewhere classified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 640 through 641. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fluid and electrolyte disorders.

Code Identity

ICD-10-CM Code
E87.8
Billable Status
Yes — Valid for Submission
Code Describes
Other disorders of electrolyte and fluid balance, not elsewhere classified
Short Description
Oth disorders of electrolyte and fluid balance, NEC
Parent Code
E87
Other disorders of fluid, electrolyte and acid-base balance

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE70-E88Metabolic disorders
CategoryE87Other disorders of fluid, electrolyte and acid-base balance
This CodeE87.8Other disorders of electrolyte and fluid balance, not elsewhere classified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alacrima
  • Autonomic neuropathy due to sodium channelopathy
  • Bicarbonate level - finding
  • Chloride disorder
  • Congenital anomaly of lacrimal gland
  • Defective osmoregulation
  • Deficiency of carbonate dehydratase
  • Depletion of electrolyte
  • Dilated cardiomyopathy due to electrolyte imbalance
  • Dilated cardiomyopathy due to metabolic disorder
  • Disorder of acid-base balance
  • Disorder of electrolytes
  • Disorder of fluid AND/OR electrolyte
  • Disorder of osmoregulation
  • Electrolyte imbalance
  • Electrolytes outside reference range
  • Fluid imbalance
  • Fluid volume disorder
  • HELIX syndrome
  • Hyperchloremia
  • Hyperoxia
  • Hypochloremia
  • Hypohidrosis
  • Increased anion gap
  • Isolated hyperchlorhidrosis
  • McKittrick-Wheelock syndrome
  • Negative fluid balance
  • Osmolality disturbance
  • Osmoregulation defect - excess thirst
  • Osmotic disturbance
  • Persistent abnormal electrolytes
  • Potassium disorder
  • Reduced anion gap
  • Reset hypothalamic osmostat
  • Reversed anion gap
  • Salt-losing nephropathy
  • Seizure, sensorineural deafness, ataxia, intellectual disability, electrolyte imbalance syndrome
  • Serum bicarbonate above reference range
  • Serum bicarbonate below reference range
  • Serum bicarbonate level outside reference range
  • Sodium disorder
  • Xerostomia

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Electrolyte imbalance NOS
  • Hyperchloremia
  • Hypochloremia

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Decrease(d)
      • tolerance
        • salt and water
    • Disorder(of)
      • balance
        • acid-base
    • Disorder(of)
      • balance
        • electrolyte
    • Disorder(of)
      • balance
        • fluid NEC
    • Disorder(of)
      • electrolyte (balance) NEC
    • Disorder(of)
      • fluid balance
    • Disorder(of)
      • metabolism NOS
        • sodium
    • Disturbance(s)
      • acid-base equilibrium
    • Disturbance(s)
      • metabolism
        • sodium NEC
    • Electrolyte imbalance
    • Findings, abnormal, inconclusive, without diagnosis
      • bicarbonate
    • Findings, abnormal, inconclusive, without diagnosis
      • chloride
    • Hyperchloremia
    • Hyperelectrolytemia
    • Hypochloremia
    • Imbalance
      • electrolyte
    • Syndrome
      • disequilibrium

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR END011
Fluid and electrolyte disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Hyperoxia

    an abnormal increase in the amount of oxygen in the tissues and organs.

  • Hypohidrosis

    abnormally diminished or absent perspiration. both generalized and segmented (reduced or absent sweating in circumscribed locations) forms of the disease are usually associated with other underlying conditions.

  • Xerostomia

    decreased salivary flow.

  • Grade 2 Hypohidrosis, CTCAE|Grade 2 Hypohidrosis

    symptomatic; limiting instrumental adl or mild/moderate impact on age-appropriate normal daily activity (pediatric)

  • Grade 3 Hypohidrosis, CTCAE|Grade 3 Hypohidrosis

    increase in body temperature; limiting self-care adl or severe impact on age-appropriate normal daily activity (pediatric)

  • Grade 4 Hypohidrosis, CTCAE|Grade 4 Hypohidrosis

    life-threatening consequences; urgent intervention indicated

  • Electrolyte Imbalance

    higher or lower than normal values for the serum electrolytes; usually affecting na, k, chl, co2, glucose, bun.

  • Grade 2 Hypohidrosis, CTCAE|Grade 2 Hypohidrosis

    symptomatic; limiting instrumental adl

  • Grade 3 Hypohidrosis, CTCAE|Grade 3 Hypohidrosis

    increase in body temperature; limiting self care adl

  • Grade 4 Hypohidrosis, CTCAE|Grade 4 Hypohidrosis

    heat stroke

  • Grade 5 Hypohidrosis, CTCAE|Grade 5 Hypohidrosis

    death

  • Hypohidrosis

    reduced sweating. causes include burns, dehydration, radiation, and leprosy.

  • Hypohidrosis, CTCAE|Hypohidrosis|Hypohidrosis

    a disorder characterized by reduced sweating.

Patient EducationClinical

Fluid and Electrolyte Balance

Electrolytes are minerals that have an electric charge when they are dissolved in water or body fluids, including blood. The electric charge can be positive or negative. You have electrolytes in your blood, urine (pee), tissues, and other body fluids.

The full article covers:

  • What are electrolytes?
  • What are the different types of electrolytes in your body?
  • What is an electrolyte imbalance?
  • What are the different types of electrolyte imbalances?
  • How are electrolyte imbalances diagnosed?
  • What are the treatments for electrolyte imbalances?

Read the full article at MedlinePlus

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

Convert E87.8 to ICD-9-CMHistory

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

ICD-9-CM
276.9 Electrolyt/fluid dis NEC
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E87.8Overview

Is E87.8 (Other disorders of fluid, electrolyte and acid-base balance) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other disorders of electrolyte and fluid balance, not elsewhere classified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does E87.8 group to?

When other disorders of electrolyte and fluid balance, not elsewhere classified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 640, 641, with relative weights from 0.7782 to 1.3356 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of E87.8?

Under the General Equivalence Mappings, other disorders of electrolyte and fluid balance, not elsewhere classified converts to ICD-9-CM 276.9 (electrolyt/fluid dis NEC). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.