E26.9 — Hyperaldosteronism, unspecified

E26.9

ICD-10 Chapter 4: Endocrine, Nutritional & Metabolic — illustrative image — Chapter 4: Endocrine, nutritional and metabolic diseases (E00–E89) — illustrative image

What this code means

Hyperaldosteronism is excess production of aldosterone by the adrenal glands, raising blood pressure and lowering potassium.

Also called: hyperaldosteronism, conn syndrome.

When this code is used

Used for hyperaldosteronism when the type is not specified.

Where it sits in ICD-10-CM

Code E26.9 belongs to Chapter 4: Endocrine, nutritional and metabolic diseases, which covers codes E00–E89 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Learn more about this condition

Condition guide: Hypertension

Watch: related videos

▶ WatchConn s syndrome primary hyperaldosteronism

Frequently asked questions

What is ICD-10-CM code E26.9?

E26.9 is the ICD-10-CM diagnosis code for “Hyperaldosteronism, unspecified”. Hyperaldosteronism is excess production of aldosterone by the adrenal glands, raising blood pressure and lowering potassium.

When is code E26.9 used?

Used for hyperaldosteronism when the type is not specified. It belongs to Chapter 4 of ICD-10-CM (Endocrine, nutritional and metabolic diseases).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.