Is E24.3 a billable ICD-10-CM code?

Yes. E24.3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does E24.3 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 E24.3?

E24.3 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above E24.3 (E24) and apply to it just the same.

E24.3

E24.3 — Ectopic ACTH syndrome

Billable / specific codeICD-10-CM

E24.3 is a billable, specific ICD-10-CM code for ectopic acth syndrome. It is valid for submission on a claim.

Excludes1 inherited from the categories above E24.3

These are not written on E24.3, but they bind it: a note on a category applies to every code beneath it. Billing E24.3 with anything listed here is a denial.

Written on E24 — Cushing's syndrome

congenital adrenal hyperplasia (E25.0)

Other codes that can never be billed with E24.3

These codes carry an Excludes1 note pointing at E24.3. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E24.3 alone.

E22Hyperfunction of pituitary gland
E27.0Other adrenocortical overactivity
E34.2Ectopic hormone secretion, not elsewhere classified

Risk adjustment

E24.3 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.

Medicare coverage

E24.3 is named in 12 Medicare coverage policies — 12 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A54923Billing and Coding: Bariatric Surgery for Treatment of Co-Morbidities Conditions Related to Morbid Obesity
A56421Billing and Coding: CT of the Abdomen and Pelvis
A56612Billing and Coding: CT of the Head
A57132Billing and Coding: Bone Mass Measurement

How E24.3 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to E24.3.

ACTH ectopic syndrome
Ectopic, ectopia›ACTH syndrome
Syndrome›ectopic ACTH
Syndrome›Cushing's›due to›ectopic ACTH

Code history

E24.3 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share E24. If E24.3 is not quite right, the correct code is usually one of these.

Questions about E24.3

Is E24.3 a billable ICD-10-CM code?: Yes. E24.3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does E24.3 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 E24.3?: E24.3 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above E24.3 (E24) and apply to it just the same.