Is E03 a billable ICD-10-CM code?

No. E03 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does E03 sit in the tabular list?

Endocrine, nutritional and metabolic diseases (E00-E89), in the block Disorders of thyroid gland (E00-E07).

What cannot be coded together with E03?

E03 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

E03

E03 — Other hypothyroidism

Non-billable headerICD-10-CM

E03 is a non-billable header ICD-10-CM code for other hypothyroidism. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

iodine-deficiency related hypothyroidism (E00-E02)
postprocedural hypothyroidism (E89.0)

Other codes that can never be billed with E03

These codes carry an Excludes1 note pointing at E03. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E03 alone.

L98.5Mucinosis of the skin
P72Other transitory neonatal endocrine disorders
Q89.2Congenital malformations of other endocrine glands
E03.4Atrophy of thyroid (acquired)
E04Other nontoxic goiter

Risk adjustment

E03 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead E03

8 child codes. Green means billable.

Questions about E03

Is E03 a billable ICD-10-CM code?: No. E03 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does E03 sit in the tabular list?: Endocrine, nutritional and metabolic diseases (E00-E89), in the block Disorders of thyroid gland (E00-E07).
What cannot be coded together with E03?: E03 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.