Is E01 a billable ICD-10-CM code?

No. E01 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does E01 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 E01?

E01 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

E01

E01 — Iodine-deficiency related thyroid disorders and allied conditions

Non-billable headerICD-10-CM

E01 is a non-billable header ICD-10-CM code for iodine-deficiency related thyroid disorders and allied conditions. 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.

congenital iodine-deficiency syndrome (E00.-)
subclinical iodine-deficiency hypothyroidism (E02)

Risk adjustment

E01 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 E01

4 child codes. Green means billable.

Questions about E01

Is E01 a billable ICD-10-CM code?: No. E01 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does E01 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 E01?: E01 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.