ICD-10-CM 2027
ICD-10 code for idiopathic pericarditis
From the official ICD-10-CM alphabetic index entry “Pericarditis (with decompensation) (with effusion) › idiopathic”. Page updated September 29, 2026.
About coding idiopathic pericarditis
The ICD-10-CM code for idiopathic pericarditis is I30.0 (Acute nonspecific idiopathic pericarditis).
Within I30 (acute pericarditis), I30.0 is specifically for acute nonspecific idiopathic pericarditis. Related codes cover infective pericarditis (I30.1), other forms of acute pericarditis (I30.8) and unspecified (I30.9).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
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 idiopathic pericarditis ICD-10 codes
What is the ICD-10 code for idiopathic pericarditis?
- I30.0 — Acute nonspecific idiopathic pericarditis.
Is I30.0 billable?
- Yes. I30.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I30.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I30.0 as a principal diagnosis.
Is I30.0 a CC or MCC?
- I30.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.