Acute pericarditis (I30) ICD-10-CM
The I30 code range covers acute pericarditis with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- acute mediastinopericarditis
- acute myopericarditis
- acute pericardial effusion
- acute pleuropericarditis
- acute pneumopericarditis
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the I30 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I30 range.
Pericardium
A conical fibro-serous sac surrounding the HEART and the roots of the great vessels (AORTA; VENAE CAVAE; PULMONARY ARTERY). Pericardium consists of two sacs: the outer fibrous pericardium and the inner serous pericardium. The latter consists of an outer parietal layer facing the fibrous pericardium, and an inner visceral layer (epicardium) resting next to the heart, and a pericardial cavity between these two layers.
Pneumopericardium
Presence of air or gas in the space between the heart and the PERICARDIUM. The degree of respiratory distress depends on the amount of trapped air and circulation blocked in the systemic and pulmonary veins.
About the I30 Code Range
ICD-10 code for acute pericarditis encompasses several specific conditions involving inflammation of the pericardium, the sac surrounding the heart. These codes are used to classify different types of acute pericarditis, including idiopathic, infective, other specified forms, and unspecified cases.
The main category I30 covers general acute pericarditis, while I30.0 specifies acute nonspecific idiopathic pericarditis, also known as acute idiopathic or idiopathic recurrent pericarditis. The code I30.1 represents infective pericarditis, including bacterial types like pyogenic and pneumococcal pericarditis, viral pericarditis, and other infectious causes. Code I30.8 identifies other forms such as acute fibrinous, serofibrinous, and effusive pericarditis, often involving pericardial effusion or adhesion. Lastly, I30.9 is used for unspecified acute pericarditis cases, covering presentations like acute myopericarditis, pneumopericardium, and acute pleuropericarditis. These distinctions help ensure accurate diagnosis and treatment coding for various acute pericardial diseases.
Questions About This Page
How many billable codes are in the I30 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I30 range classify?
The range classifies acute pericarditis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
