Is E28 a billable ICD-10-CM code?

No. E28 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does E28 sit in the tabular list?

Endocrine, nutritional and metabolic diseases (E00-E89), in the block Disorders of other endocrine glands (E20-E35).

What cannot be coded together with E28?

E28 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

E28

E28 — Ovarian dysfunction

Non-billable headerICD-10-CM

E28 is a non-billable header ICD-10-CM code for ovarian dysfunction. 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.

isolated gonadotropin deficiency (E23.0)
postprocedural ovarian failure (E89.4-)

Other codes that can never be billed with E28

These codes carry an Excludes1 note pointing at E28. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E28 alone.

N83.2Other and unspecified ovarian cysts
N91Absent, scanty and rare menstruation
N95Menopausal and other perimenopausal disorders
N95.1Menopausal and female climacteric states

Risk adjustment

E28 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 E28

6 child codes. Green means billable.

Questions about E28

Is E28 a billable ICD-10-CM code?: No. E28 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does E28 sit in the tabular list?: Endocrine, nutritional and metabolic diseases (E00-E89), in the block Disorders of other endocrine glands (E20-E35).
What cannot be coded together with E28?: E28 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.