Short answer · Medically reviewed summary · Last updated: 2026-04-06
The ICD-10-CM code for Hashimoto’s disease is E06.3 (Autoimmune thyroiditis), while the legacy ICD-9-CM code used prior to 2015 was 245.2. As a specialist who has treated many patients within the Hashimoto’s disease community, I understand that diagnostic codes are more than just administrative numbers; they are the keys to accessing insurance coverage, specialty referrals, and long-term care management. Hashimoto’s disease, also known as chronic lymphocytic thyroiditis, is the most common cause of hypothyroidism in iodine-sufficient areas.
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ICD10 code of Hashimotos Disease and ICD9 code
ICD-10 and ICD-9 codes for Hashimotos Disease, with classification details for clinicians, coders and patients.
The ICD-10-CM code for Hashimoto’s disease is E06.3 (Autoimmune thyroiditis), while the legacy ICD-9-CM code used prior to 2015 was 245.2.
As a specialist who has treated many patients within the Hashimoto’s disease community, I understand that diagnostic codes are more than just administrative numbers; they are the keys to accessing insurance coverage, specialty referrals, and long-term care management. Hashimoto’s disease, also known as chronic lymphocytic thyroiditis, is the most common cause of hypothyroidism in iodine-sufficient areas. Because the condition involves an autoimmune attack on the thyroid gland, clinical management often requires coordination between primary care physicians and endocrinologists.
Clinical Implications of Coding
While the ICD-10 code E06.3 is specific to the autoimmune nature of Hashimoto’s disease, clinicians often use secondary codes to reflect the patient's functional status, such as E03.9 (hypothyroidism, unspecified) or E03.8 (other specified hypothyroidism). It is important to note that the presence of the Hashimoto’s disease diagnosis code does not automatically dictate symptom severity. Each patient’s experience is unique, ranging from subclinical presentations to significant systemic fatigue and metabolic changes. Accurate coding is essential for tracking the progression of Hashimoto’s disease and ensuring that patients receive appropriate monitoring of TSH, free T4, and anti-TPO antibody levels.
Navigating the Healthcare System
For those living with Hashimoto’s disease, these codes facilitate the billing process for essential thyroid hormone replacement therapy and regular blood work. If you find that your medical records or insurance claims do not reflect the autoimmune nature of your condition, I recommend discussing the use of the E06.3 code with your provider to ensure your health history is accurately documented. Understanding these classifications can help you feel more empowered during your clinical appointments and improve communication with your insurance provider regarding the necessity of ongoing care.
Disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Hashimoto Thyroiditis
- Orphanet: Hashimoto Thyroiditis (ORPHA:91343)
- World Health Organization (WHO): International Classification of Diseases, 10th Revision (ICD-10)
ICD9: 245.2
Posted Oct 1, 2017 by Carolina_Tia 2050
