What is the appropriate ICD‑10‑CM diagnosis code for a large thyroid (goiter)?

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ICD-10-CM Code for Large Thyroid (Goiter)

The appropriate ICD-10-CM code for a large thyroid (goiter) is E04.9 (Nontoxic goiter, unspecified) for a simple enlarged thyroid, or use more specific codes based on the clinical presentation: E04.0 for nontoxic diffuse goiter, E04.1 for nontoxic single thyroid nodule, or E04.2 for nontoxic multinodular goiter.

Code Selection Algorithm

The specific ICD-10-CM code depends on the morphology and functional status of the enlarged thyroid:

Primary Coding Considerations:

1. Determine if the goiter is toxic (hyperfunctioning) or nontoxic:

  • If thyroid function tests show hyperthyroidism (low TSH), use E05.x codes
  • If euthyroid (normal thyroid function), use E04.x codes

2. Characterize the morphology:

  • E04.0 - Nontoxic diffuse goiter (uniformly enlarged thyroid without nodules)
  • E04.1 - Nontoxic single thyroid nodule
  • E04.2 - Nontoxic multinodular goiter (multiple nodules)
  • E04.9 - Nontoxic goiter, unspecified (when morphology is not yet characterized)

3. For toxic goiters with hyperthyroidism:

  • E05.0x - Thyrotoxicosis with diffuse goiter (Graves' disease)
  • E05.1x - Thyrotoxicosis with toxic single thyroid nodule
  • E05.2x - Thyrotoxicosis with toxic multinodular goiter

Clinical Context

The term "large thyroid" or goiter refers to thyroid enlargement that may present as a diffuse palpable abnormality or with obstructive symptoms including dyspnea, orthopnea, obstructive sleep apnea, dysphagia, and dysphonia due to mass effect on the trachea or esophagus 1.

Important Coding Pitfalls:

  • Do not use E04.9 if you have imaging or clinical information that specifies whether the goiter is diffuse, uninodular, or multinodular—use the more specific codes
  • Always check thyroid function tests first to distinguish between toxic (E05.x) and nontoxic (E04.x) goiter
  • Substernal extension does not change the primary code—it's documented separately if needed for surgical planning 1
  • Size alone ("large") does not determine the code—morphology and function are the key determinants

Additional Considerations:

If the patient has compressive symptoms requiring documentation for surgical planning, consider adding codes for:

  • R06.0 (Dyspnea)
  • R13.10 (Dysphagia, unspecified)
  • R49.0 (Dysphonia)

These secondary codes help justify imaging studies and surgical intervention when the goiter causes tracheal compression or other obstructive symptoms 1.

References

1
Guideline

acr appropriateness criteria<sup>®</sup> thyroid disease.

Journal of the American College of Radiology, 2019

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.