ICD-10-CM 2027
ICD-10 code for secondary hyperaldosteronism
From the official ICD-10-CM alphabetic index entry “Hyperaldosteronism › secondary”. Page updated September 29, 2026.
About coding secondary hyperaldosteronism
The ICD-10-CM code for secondary hyperaldosteronism is E26.1 (Secondary hyperaldosteronism).
Within E26 (hyperaldosteronism), E26.1 is specifically for secondary hyperaldosteronism. Related codes cover primary hyperaldosteronism (E26.0), other hyperaldosteronism (E26.8) and unspecified (E26.9).
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.
Common questions about secondary hyperaldosteronism ICD-10 codes
What is the ICD-10 code for secondary hyperaldosteronism?
- E26.1 — Secondary hyperaldosteronism.
Is E26.1 billable?
- Yes. E26.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can E26.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict E26.1 as a principal diagnosis.
Is E26.1 a CC or MCC?
- No. E26.1 is neither a CC nor an MCC under MS-DRG v44.0.