ICD-10 Code E01.8 – Other iodine-deficiency related thyroid disorders and allied conditions (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E01.8 – Other iodine-deficiency related thyroid disorders and allied conditions
What it is
This code identifies thyroid disorders linked to iodine deficiency that do not fit a more specific E01 category. Use it when the record documents an iodine-related thyroid condition, but the exact subtype is not named.
Clinical signs
Clinical features vary; refer to documentation. Records may note goiter, thyroid enlargement, or other findings consistent with iodine deficiency, but you should not assume severity or specific symptoms without support.
When to use this code
Use E01.8 when the provider documents an iodine-deficiency related thyroid disorder or an allied condition and does not specify a different E01 code. It is appropriate when the diagnosis is clearly tied to iodine deficiency but remains otherwise unspecified. Check documentation if the chart only mentions thyroid disease without that link.
Do not use for
Do not use this code for hypothyroidism, hyperthyroidism, or thyroid disorders with another documented cause. If the record does not connect the condition to iodine deficiency, check documentation and select a more specific diagnosis.
Coding tip
Confirm that the provider explicitly documents iodine deficiency or an iodine-related thyroid disorder before assigning E01.8.