2026 ICD-10-CM Diagnosis Code E26.9Hyperaldosteronism, unspecified
ICD-10-CM Codes›E00–E89›E20-E35›E26
- Billable — Valid for Submission
- Chronic Condition
E26.9 is a billable ICD-10-CM diagnosis code for hyperaldosteronism, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 643 through 645. Coders also document this condition as hyperaldosteronism. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified endocrine disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Hyperaldosteronism
- Hyperaldosteronism with nodular hyperplasia of adrenal cortex
- Nodular hyperplasia of adrenal cortex
- Nodule of adrenal cortex
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Aldosteronism NOS
- Hyperaldosteronism NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Aldosteronism - E26.9
- Hyperaldosteronism - E26.9
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Aldosteronism
- Hyperaldosteronism
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Hyperaldosteronism
a condition caused by the overproduction of aldosterone. it is characterized by sodium retention and potassium excretion with resultant hypertension and hypokalemia.
Patient EducationClinical
Adrenal Gland Disorders
Your adrenal glands are two small organs that sit on top of each kidney. The adrenal glands make different types of hormones you need to stay alive and healthy. Hormones are chemicals that travel in your bloodstream and control how different parts of your body work.
The full article covers:
- What are adrenal glands?
- What are adrenal gland disorders?
- What causes adrenal gland disorders?
- How are adrenal gland disorders diagnosed?
- What are the treatments for adrenal gland disorders?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert E26.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E26.9Overview
Is E26.9 (Hyperaldosteronism) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report hyperaldosteronism, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does E26.9 group to?
When hyperaldosteronism, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 643, 644, 645, with relative weights from 0.7683 to 1.6461 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of E26.9?
Under the General Equivalence Mappings, hyperaldosteronism, unspecified converts to ICD-9-CM 255.10 (hyperaldosteronism NOS). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
