E03.9: Hypothyroidism, unspecified
Billable ICD-10-CM code, FY2027
What ICD-10-CM says
Includes
- Myxedema NOS
Notes at E03, Other hypothyroidism (they apply to every code under it)
Excludes1 (never coded with E03.9)
- iodine-deficiency related hypothyroidism (E00-E02)
- postprocedural hypothyroidism (E89.0)
What E03.9 covers
E03.9 is for hypothyroidism when no cause or type is documented. It includes myxedema NOS. It is very common in primary care and endocrinology.
Specific causes have their own codes: hypothyroidism due to medicaments (E03.2), postinfectious (E03.3), congenital (E03.0, E03.1) and atrophy of thyroid (E03.4). Myxedema coma is E03.5, and autoimmune (Hashimoto's) thyroiditis is E06.3.
Billing and coding notes
The E03 category has an excludes1 for postprocedural hypothyroidism (E89.0) and iodine-deficiency hypothyroidism (E00-E02). Hypothyroidism after thyroid surgery or radioactive iodine is coded E89.0, not E03.9.
E03.9 is billable but unspecified. When the provider documents a cause, use the specific code.
Related codes under E03
Questions about E03.9
What is the difference between E03.9 and E89.0?
E03.9 is hypothyroidism with no documented cause. E89.0 is postprocedural hypothyroidism, after thyroid surgery or radiation, and it is an excludes1 at E03.
Is E03.9 billable?
Yes. E03.9 is a complete code.
ICD-10-CM in CloudMedico
In CloudMedico, a visit's diagnoses come from the current ICD-10-CM list. For US practices, the visit flags a code that isn't billable on its date, and a superbill made from an invoice carries the visit's diagnoses.
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