Is E05 a billable ICD-10-CM code?

No. E05 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does E05 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 E05?

E05 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

E05

E05 — Thyrotoxicosis [hyperthyroidism]

Non-billable headerICD-10-CM

E05 is a non-billable header ICD-10-CM code for thyrotoxicosis [hyperthyroidism]. 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.

chronic thyroiditis with transient thyrotoxicosis (E06.2)
neonatal thyrotoxicosis (P72.1)

Other codes that can never be billed with E05

These codes carry an Excludes1 note pointing at E05. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E05 alone.

E22Hyperfunction of pituitary gland

Risk adjustment

E05 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 E05

7 child codes. Green means billable.

Questions about E05

Is E05 a billable ICD-10-CM code?: No. E05 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does E05 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 E05?: E05 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.