ICD-10 Code for hypothyroidism
The ICD-10-CM code for hypothyroidism is E03.9 when documented without further specification. Unspecified hypothyroidism is E03.9; autoimmune (Hashimoto's) and post-surgical causes have their own codes.
Which Code Should You Use?
What to Document
- Cause when known (autoimmune, post-surgical, drug-induced E03.2).
- Long-term levothyroxine therapy (no Z79 analog - the condition code suffices).
- Pregnancy context (O99.28- applies as the first-listed code).
Coding Notes
"Hypothyroidism" alone indexes to E03.9. Myxedema coma is the higher-acuity E03.5.