ICD-10-CM 2027
ICD-10 code for Eisenmenger's complex
From the official ICD-10-CM alphabetic index entry “Complex › Eisenmenger's (ventricular septal defect)”. Page updated September 29, 2026.
About coding Eisenmenger's complex
The ICD-10-CM code for Eisenmenger's complex is I27.83 (Eisenmenger's syndrome).
Within I27.8 (other specified pulmonary heart diseases), I27.83 is specifically for Eisenmenger's syndrome. Related codes cover cor pulmonale (chronic) (I27.81), chronic pulmonary embolism (I27.82), Fontan related circulation (I27.84) and other specified pulmonary heart diseases (I27.89).
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 314 (Other Circulatory System Diagnoses with MCC, relative weight 2.0873), DRG 315 (Other Circulatory System Diagnoses with CC, relative weight 0.9508) and DRG 316 (Other Circulatory System Diagnoses without CC/MCC, relative weight 0.6677), in MDC 05 (Diseases and Disorders of the Circulatory System), 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 Eisenmenger's complex ICD-10 codes
What is the ICD-10 code for Eisenmenger's complex?
- I27.83 — Eisenmenger's syndrome.
Is I27.83 billable?
- Yes. I27.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I27.83 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I27.83 as a principal diagnosis.
Is I27.83 a CC or MCC?
- No. I27.83 is neither a CC nor an MCC under MS-DRG v44.0.