Is E23 a billable ICD-10-CM code?

No. E23 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does E23 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 E23?

E23 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

E23

E23 — Hypofunction and other disorders of the pituitary gland

Non-billable headerICD-10-CM

E23 is a non-billable header ICD-10-CM code for hypofunction and other disorders of the pituitary gland. 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.

postprocedural hypopituitarism (E89.3)
short stature due to endocrine disorder (E34.3-)

Includes

Conditions this code covers.

the listed conditions whether the disorder is in the pituitary or the hypothalamus

Other codes that can never be billed with E23

These codes carry an Excludes1 note pointing at E23. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E23 alone.

N25.1Nephrogenic diabetes insipidus
R62Lack of expected normal physiological development in childhood and adults
E28Ovarian dysfunction
E29Testicular dysfunction
E87Other disorders of fluid, electrolyte and acid-base balance
E34.3Short stature due to endocrine disorder

Risk adjustment

E23 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 E23

6 child codes. Green means billable.

Questions about E23

Is E23 a billable ICD-10-CM code?: No. E23 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does E23 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 E23?: E23 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.