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v1.0.0
ICD-10 Guide
DiagnosesAcute Metabolic Encephalopathy

Acute Metabolic Encephalopathy

ICD-10 Coding for Acute Metabolic Encephalopathy(G93.41, G93.40)

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

Diagnosis Overview

What is Acute Metabolic Encephalopathy?
Essential facts and insights about Acute Metabolic Encephalopathy

Key Clinical Considerations:

  • Altered mental status, including confusion, disorientation, or decreased level of consciousness.
  • Laboratory findings may include electrolyte imbalances, renal function abnormalities, or hepatic dysfunction.
  • Physical examination may reveal neurological deficits, signs of systemic illness, or altered vital signs.
  • Imaging studies such as CT or MRI may show no structural abnormalities but can rule out other causes.
  • Severity criteria may include the duration of symptoms and the degree of cognitive impairment.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Comprehensive documentation of the patient's clinical presentation, including onset and duration of symptoms.
  • Specific terminology such as 'acute metabolic encephalopathy' must be used to ensure clarity.
  • Examples include documenting the patient's mental status changes and any relevant lab results.
  • Medical necessity must be established through documentation of the clinical rationale for testing and treatment.
  • Quality measures may include tracking the patient's cognitive status and response to treatment.

Coding Guidelines

Usage Guidelines & Examples

  • Use G93.41 for acute metabolic encephalopathy due to specific metabolic derangements; use G93.40 for unspecified metabolic encephalopathy.
  • Do not use these codes for encephalopathy due to structural lesions or infections.
  • G93.41 is distinct from G93.42 (toxic encephalopathy) and G93.43 (post-traumatic encephalopathy) as they have different etiologies.
  • Common errors include misclassifying the type of encephalopathy; ensure the underlying cause is documented.
  • In complex cases, consider the patient's full clinical picture and any co-existing conditions that may influence coding.

Code Exclusions

Important Exclusions

  • Excludes encephalopathy due to structural brain lesions (e.g., tumors, hemorrhages).
  • Alternative codes for excluded conditions include those for specific infections or traumatic brain injuries.
  • Conditions are excluded because they have distinct etiologies and treatment protocols.
  • Common mistakes include misclassifying metabolic encephalopathy as toxic or post-traumatic without proper documentation.
  • Related but distinct conditions include hepatic encephalopathy and uremic encephalopathy.

Related ICD-10 Codes

Primary Codes
G93.41
Acute metabolic encephalopathy
G93.40
Metabolic encephalopathy, unspecified
Ancillary Codes
R40.20
G93.41
.
E87.2
G93.41
if metabolic acidosis is a contributing factor.
Differential Codes
G93.40
G93.40
when the type of encephalopathy is not specified.
G92.8
G92.8
when encephalopathy is due to toxic causes.
G93.41
G93.41
when metabolic cause is specified.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Neurology

Specialty Applications

  • Conditions such as liver failure, renal failure, or severe electrolyte imbalances.
  • Patient populations include all ages, particularly those with underlying metabolic disorders.
  • Clinical settings include inpatient hospitalizations, emergency departments, and outpatient follow-ups.
  • Specialty applications primarily in neurology, but also relevant in critical care and internal medicine.
  • Treatment contexts include acute management in emergency settings and ongoing management in outpatient care.

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

Template 1

Template: 'Patient diagnosed with acute metabolic encephalopathy based on clinical findings of confusion and lab results showing electrolyte imbalance.'

Template 2

Template: 'Clinical presentation consistent with acute metabolic encephalopathy including altered mental status and abnormal renal function tests.'

Template 3

Template: 'Diagnostic criteria for acute metabolic encephalopathy met as evidenced by laboratory findings of hypernatremia and neurological assessment.'

Template 4

Template: 'Treatment plan initiated for acute metabolic encephalopathy with interventions including electrolyte correction and monitoring.'

Template 5

Template: 'Follow-up care for acute metabolic encephalopathy including cognitive assessments and lab monitoring.'

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

What documentation is required for this diagnosis?

Detailed documentation of clinical findings, lab results, and treatment rationale.

How does this differ from similar diagnoses?

Acute metabolic encephalopathy is specifically related to metabolic derangements, unlike toxic or traumatic encephalopathy.

What are common billing considerations?

Ensure that the diagnosis is supported by medical necessity and that all relevant tests are documented.

What procedures are typically associated?

Related CPT codes may include those for metabolic panels, imaging studies, and neurological assessments.

Are there any quality reporting implications?

Quality measures may include tracking cognitive function and treatment outcomes in patients with metabolic encephalopathy.