ICD-10-CM 2027
ICD-10 code for hyperaldosteronism
From the official ICD-10-CM alphabetic index entry “Hyperaldosteronism”. Page updated September 29, 2026.
About coding hyperaldosteronism
The ICD-10-CM code for hyperaldosteronism is E26.9 (Hyperaldosteronism, unspecified). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on E26.9.
Within E26, choose E26.9 (unspecified) only when documentation doesn't support a more specific option: primary hyperaldosteronism (E26.0), secondary hyperaldosteronism (E26.1) and other hyperaldosteronism (E26.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 643 (Endocrine Disorders with MCC, relative weight 1.6139), DRG 644 (Endocrine Disorders with CC, relative weight 1.0044) and DRG 645 (Endocrine Disorders without CC/MCC, relative weight 0.7459), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific hyperaldosteronism codes (official index)
- familial (type I) E26.02 — Glucocorticoid-remediable aldosteronism
- glucocorticoid-remediable E26.02 — Glucocorticoid-remediable aldosteronism
- primary (due to (bilateral) adrenal hyperplasia) E26.09 — Other primary hyperaldosteronism
- primary NEC E26.09 — Other primary hyperaldosteronism
- secondary E26.1 — Secondary hyperaldosteronism
- specified NEC E26.89 — Other hyperaldosteronism
Common questions about hyperaldosteronism ICD-10 codes
What is the ICD-10 code for hyperaldosteronism?
- E26.9 — Hyperaldosteronism, unspecified. More specific codes apply when the documentation supports them: E26.02, E26.02, E26.09, E26.09 and others below.
What is the ICD-10 code for familial hyperaldosteronism?
- E26.02 — Glucocorticoid-remediable aldosteronism.
What is the ICD-10 code for glucocorticoid-remediable hyperaldosteronism?
- E26.02 — Glucocorticoid-remediable aldosteronism.
What is the ICD-10 code for primary adrenal hyperplasia) hyperaldosteronism?
- E26.09 — Other primary hyperaldosteronism.
What is the ICD-10 code for primary nec hyperaldosteronism?
- E26.09 — Other primary hyperaldosteronism.
What is the ICD-10 code for secondary hyperaldosteronism?
- E26.1 — Secondary hyperaldosteronism.
Is E26.9 billable?
- Yes. E26.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E26.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E26.9 as a principal diagnosis.
Is E26.9 a CC or MCC?
- No. E26.9 is neither a CC nor an MCC under MS-DRG v44.0.