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ICD-10 Guide
ICD-10 CodesChapter 4: Endocrine, nutritional and metabolic diseasesE03

E03

Billable

Other hypothyroidism

Chapter 4:Endocrine, nutritional and metabolic diseases

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

Code Description

ICD-10 E03 is a billable code used to indicate a diagnosis of other hypothyroidism.

Key Diagnostic Point:

Other hypothyroidism (E03) refers to a group of conditions characterized by insufficient production of thyroid hormones, which can lead to a variety of metabolic and physiological disturbances. This condition can arise from various etiologies, including autoimmune disorders such as Hashimoto's thyroiditis, congenital hypothyroidism, or secondary causes related to pituitary dysfunction. Patients may present with symptoms such as fatigue, weight gain, cold intolerance, dry skin, and hair loss. Diagnosis typically involves thyroid function tests, including serum levels of Thyroid Stimulating Hormone (TSH) and free thyroxine (FT4). An elevated TSH level with low FT4 indicates primary hypothyroidism, while low TSH with low FT4 suggests secondary causes. Iodine deficiency is a significant contributor to hypothyroidism globally, particularly in regions where iodine supplementation is not prevalent. Treatment usually involves thyroid hormone replacement therapy, with levothyroxine being the most commonly prescribed medication. Regular monitoring of thyroid function tests is essential to ensure appropriate dosing and management of the condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of underlying causes leading to hypothyroidism
  • Need for accurate interpretation of thyroid function tests
  • Differentiation from other thyroid disorders such as hyperthyroidism
  • Potential for co-existing conditions affecting thyroid function

Audit Risk Factors

  • Inadequate documentation of thyroid function test results
  • Failure to specify the underlying cause of hypothyroidism
  • Misclassification of hypothyroidism type (primary vs. secondary)
  • Lack of follow-up documentation for treatment efficacy

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Thorough documentation of patient history, physical examination findings, and laboratory results related to thyroid function.

Common Clinical Scenarios

Patients presenting with fatigue, weight changes, or other symptoms suggestive of thyroid dysfunction.

Billing Considerations

Endocrinologists must ensure that all relevant lab tests are documented to support the diagnosis and treatment plan.

Primary Care

Documentation Requirements

Complete patient history, including family history of thyroid disease, and documentation of symptoms and lab results.

Common Clinical Scenarios

Routine screening for hypothyroidism in patients with risk factors or presenting symptoms.

Billing Considerations

Primary care providers should be aware of the need for regular monitoring and follow-up of thyroid function tests.

Coding Guidelines

Inclusion Criteria

Use E03 When
  • According to ICD
  • 10 coding guidelines, E03 should be used when hypothyroidism is not classified under other specific codes
  • It is essential to document the underlying cause if known, and to use additional codes for any associated conditions

Exclusion Criteria

Do NOT use E03 When
No specific exclusions found.

Related CPT Codes

84443CPT Code

Thyroid-stimulating hormone (TSH)

Clinical Scenario

Used to evaluate thyroid function in patients suspected of hypothyroidism.

Documentation Requirements

Document the reason for the test and any relevant clinical findings.

Specialty Considerations

Endocrinologists may require more frequent testing based on patient history.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of hypothyroidism, enabling better tracking of patient outcomes and treatment efficacy. It has also improved the granularity of data for research and public health monitoring.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of hypothyroidism, enabling better tracking of patient outcomes and treatment efficacy. It has also improved the granularity of data for research and public health monitoring.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of hypothyroidism, enabling better tracking of patient outcomes and treatment efficacy. It has also improved the granularity of data for research and public health monitoring.

Resources

Clinical References

  • •
    American Thyroid Association

Coding & Billing References

  • •
    American Thyroid Association

Frequently Asked Questions

What are the common symptoms of other hypothyroidism?

Common symptoms include fatigue, weight gain, cold intolerance, dry skin, hair loss, and depression. Patients may also experience muscle weakness and joint pain.