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ICD-10 Guide
ICD-10 CodesG36.9

G36.9

Billable

Acute disseminated demyelination, unspecified

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 G36.9 is a billable code used to indicate a diagnosis of acute disseminated demyelination, unspecified.

Key Diagnostic Point:

Acute disseminated demyelination (ADD) is a neurological condition characterized by the rapid onset of demyelination in the central nervous system (CNS). It is often considered a monophasic illness, meaning it typically occurs as a single episode rather than a recurrent condition. The most common presentation of ADD is in children and young adults, often following a viral infection. Symptoms may include visual disturbances, motor weakness, sensory changes, and cognitive dysfunction. The pathophysiology involves an autoimmune response leading to the destruction of myelin, the protective sheath surrounding nerve fibers, which disrupts normal nerve conduction. While ADD can be associated with multiple sclerosis (MS), it is distinct in that it does not necessarily lead to the chronic, relapsing nature of MS. Diagnosis is primarily clinical, supported by MRI findings showing lesions in the CNS, and cerebrospinal fluid analysis may reveal oligoclonal bands. Treatment typically involves high-dose corticosteroids to reduce inflammation and promote recovery. Immunomodulatory therapies may be considered in cases with significant neurological deficits or recurrent episodes.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between acute disseminated demyelination and multiple sclerosis.
  • Variability in clinical presentation and symptomatology.
  • Need for comprehensive documentation of neurological assessments.
  • Potential overlap with other demyelinating diseases.

Audit Risk Factors

  • Inadequate documentation of clinical findings.
  • Failure to specify the acute nature of the condition.
  • Misclassification with chronic demyelinating diseases.
  • Lack of supporting imaging or laboratory results.

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed neurological examination findings, MRI results, and treatment plans.

Common Clinical Scenarios

Patients presenting with acute neurological deficits following viral infections.

Billing Considerations

Ensure clarity in distinguishing between acute and chronic demyelinating conditions.

Pediatrics

Documentation Requirements

Developmental history, acute symptom onset details, and family history of demyelinating diseases.

Common Clinical Scenarios

Children with sudden onset of neurological symptoms post-infection.

Billing Considerations

Consider age-related variations in symptom presentation and recovery.

Coding Guidelines

Inclusion Criteria

Use G36.9 When
  • Follow official coding guidelines that emphasize the need for specificity in documentation
  • Include details on the acute nature of the condition and any relevant diagnostic tests performed
  • Ensure that the code is used only when the demyelination is acute and unspecified

Exclusion Criteria

Do NOT use G36.9 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

70450CPT Code

MRI of the brain

Clinical Scenario

Used to confirm the presence of demyelinating lesions in patients with acute neurological symptoms.

Documentation Requirements

MRI reports must be included in the patient's medical record.

Specialty Considerations

Neurologists should ensure that MRI findings correlate with clinical symptoms.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of demyelinating diseases, improving the accuracy of diagnoses and treatment tracking. G36.9 provides a distinct code for acute cases, enhancing the ability to differentiate from chronic conditions like MS.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of demyelinating diseases, improving the accuracy of diagnoses and treatment tracking. G36.9 provides a distinct code for acute cases, enhancing the ability to differentiate from chronic conditions like MS.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of demyelinating diseases, improving the accuracy of diagnoses and treatment tracking. G36.9 provides a distinct code for acute cases, enhancing the ability to differentiate from chronic conditions like MS.

Resources

Clinical References

  • •
    National Multiple Sclerosis Society

Coding & Billing References

  • •
    National Multiple Sclerosis Society

Frequently Asked Questions

What is the difference between G36.9 and G35?

G36.9 refers to acute disseminated demyelination, which is typically a single episode, while G35 refers to multiple sclerosis, a chronic condition characterized by recurrent episodes of demyelination.