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ICD-10 Guide
ICD-10 CodesG13.2

G13.2

Billable

Systemic atrophy primarily affecting the central nervous system in myxedema

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

Code Description

ICD-10 G13.2 is a billable code used to indicate a diagnosis of systemic atrophy primarily affecting the central nervous system in myxedema.

Key Diagnostic Point:

G13.2 refers to systemic atrophy that primarily affects the central nervous system as a result of myxedema, which is a severe form of hypothyroidism. This condition can lead to significant neurological deficits due to the degeneration of nerve cells and the atrophy of brain tissue. Myxedema can result from prolonged untreated hypothyroidism, often characterized by symptoms such as cognitive decline, motor dysfunction, and other neurological impairments. The atrophy may be exacerbated by hereditary and degenerative diseases, including Huntington's disease, various forms of ataxia, and motor neuron diseases. These conditions can compound the effects of myxedema, leading to more pronounced neurological symptoms. Clinicians must be vigilant in diagnosing and managing these overlapping conditions to optimize patient outcomes. Proper treatment of hypothyroidism can mitigate some of the neurological impacts, but the extent of recovery may depend on the duration and severity of the myxedema prior to treatment.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Overlap with other neurological conditions
  • Variability in presentation and symptoms
  • Need for comprehensive patient history
  • Potential for misdiagnosis with other atrophy-related codes

Audit Risk Factors

  • Inadequate documentation of thyroid function tests
  • Failure to document neurological assessments
  • Misclassification of atrophy type
  • Lack of clarity on the relationship between myxedema and neurological symptoms

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Thorough documentation of thyroid function tests, treatment plans, and patient history related to hypothyroidism.

Common Clinical Scenarios

Patients presenting with cognitive decline, fatigue, and neurological symptoms related to hypothyroidism.

Billing Considerations

Endocrinologists must ensure that the relationship between thyroid levels and neurological symptoms is clearly documented.

Neurology

Documentation Requirements

Detailed neurological assessments, imaging studies, and documentation of any hereditary or degenerative conditions.

Common Clinical Scenarios

Patients with neurological deficits who may have underlying endocrine disorders.

Billing Considerations

Neurologists should document the timeline of symptoms in relation to thyroid treatment to establish causality.

Coding Guidelines

Inclusion Criteria

Use G13.2 When
  • According to ICD
  • 10 guidelines, G13
  • 2 should be used when systemic atrophy is primarily due to myxedema
  • Coders must ensure that the underlying hypothyroidism is also documented, as it is essential for accurate coding

Exclusion Criteria

Do NOT use G13.2 When
  • Exclusion criteria include cases where atrophy is due to other primary neurological conditions without a thyroid component

Related ICD-10 Codes

Related CPT Codes

84443CPT Code

Thyroid stimulating hormone (TSH) test

Clinical Scenario

Used to evaluate thyroid function in patients suspected of having myxedema.

Documentation Requirements

Document the reason for the test and the results.

Specialty Considerations

Endocrinologists should ensure that TSH levels are interpreted in the context of neurological symptoms.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like G13.2, improving the ability to capture the complexity of systemic atrophy related to myxedema. This specificity aids in better patient management and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like G13.2, improving the ability to capture the complexity of systemic atrophy related to myxedema. This specificity aids in better patient management and resource allocation.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What is the significance of coding G13.2?

Coding G13.2 is significant as it captures the systemic effects of myxedema on the central nervous system, allowing for appropriate treatment and management of patients with hypothyroidism-related neurological symptoms.