ICD-10 code for acute pericarditis

The ICD-10-CM code for acute pericarditis is I30.9 (Acute pericarditis, unspecified). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I30.9.

Within I30, choose I30.9 (unspecified) only when documentation doesn't support a more specific option: acute nonspecific idiopathic pericarditis (I30.0), infective pericarditis (I30.1) and other forms of acute pericarditis (I30.8).

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.