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v1.0.0
ICD-10 Guide
DiagnosesMetabolic Acidosis

Metabolic Acidosis

ICD-10 Coding for Metabolic Acidosis(E87.21, E87.22)

PRIMARY SPECIALTYEmergency Medicine
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Metabolic Acidosis?
Essential facts and insights about Metabolic Acidosis

Key Clinical Considerations:

  • Rapid breathing (hyperventilation)
  • Fatigue and weakness
  • Nausea and vomiting
  • Confusion or lethargy
  • Key diagnostic tests: arterial blood gas (ABG) analysis showing low pH and low bicarbonate (HCO3)
  • Elevated anion gap or normal anion gap findings

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the underlying cause (e.g., renal failure, diabetic ketoacidosis)
  • Use specific terms like 'metabolic acidosis' and specify if it's acute or chronic
  • Examples: 'Patient presents with metabolic acidosis secondary to renal failure.'

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Ensure to differentiate between acute and chronic metabolic acidosis.
  • Common errors: Failing to document the underlying cause or misclassifying the type of acidosis.

Code Exclusions

Important Exclusions

  • Excluded conditions: Respiratory acidosis, lactic acidosis.
  • Alternative codes: Consider E87.1 for metabolic alkalosis if applicable.

Related ICD-10 Codes

Primary Codes
E87.2
Metabolic acidosis
Ancillary Codes
A41.9
N18.4
Differential Codes
E11.10
E87.21

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Emergency Medicine

Specialty Applications

  • Patient populations: Diabetics, patients with chronic kidney disease, and those with severe dehydration.
  • Clinical settings: Emergency departments, critical care units, and inpatient settings.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Document the cause, severity, and any associated conditions.

Billing considerations?

Ensure accurate coding of the underlying cause for appropriate reimbursement.