Other diseases of pericardium (I31) ICD-10-CM
The I31 code range covers other diseases of pericardium with 10 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
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 I31 Range 10 codes · 8 billable
- I31 Other diseases of pericardiumNon-billable
- I31.0 Chronic adhesive pericarditis
- I31.1 Chronic constrictive pericarditis
- I31.2 Hemopericardium, not elsewhere classified
- I31.3 Pericardial effusion (noninflammatory)Non-billable
- I31.31 Malignant pericardial effusion in diseases classified elsewhere
- I31.39 Other pericardial effusion (noninflammatory)
- I31.4 Cardiac tamponade
- I31.8 Other specified diseases of pericardium
- I31.9 Disease of pericardium, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I31 range.
Cardiac Tamponade
Compression of the heart by accumulated fluid (PERICARDIAL EFFUSION) or blood (HEMOPERICARDIUM) in the PERICARDIUM surrounding the heart. The affected cardiac functions and CARDIAC OUTPUT can range from minimal to total hemodynamic collapse.
Pericardial Effusion
Fluid accumulation within the PERICARDIUM. Serous effusions are associated with pericardial diseases. Hemopericardium is associated with trauma. Lipid-containing effusion (chylopericardium) results from leakage of THORACIC DUCT. Severe cases can lead to CARDIAC TAMPONADE.
Pericarditis
Inflammation of the PERICARDIUM from various origins, such as infection, neoplasm, autoimmune process, injuries, or drug-induced. Pericarditis usually leads to PERICARDIAL EFFUSION, or CONSTRICTIVE PERICARDITIS.
Pericarditis, Constrictive
Inflammation of the PERICARDIUM that is characterized by the fibrous scarring and adhesion of both serous layers, the VISCERAL PERICARDIUM and the PARIETAL PERICARDIUM leading to the loss of pericardial cavity. The thickened pericardium severely restricts cardiac filling. Clinical signs include FATIGUE, muscle wasting, and WEIGHT LOSS.
Pericarditis, Tuberculous
INFLAMMATION of the sac surrounding the heart (PERICARDIUM) due to MYCOBACTERIUM TUBERCULOSIS infection. Pericarditis can lead to swelling (PERICARDIAL EFFUSION), compression of the heart (CARDIAC TAMPONADE), and preventing normal beating of the heart.
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 I31 Code Range
The ICD-10 code I31 covers various other diseases of the pericardium, the sac that surrounds the heart. These codes are used to accurately document conditions like chronic pericarditis, hemopericardium, pericardial effusion, and cardiac tamponade, among others.
The ICD-10 code for chronic adhesive pericarditis (I31.0) describes long-term inflammation causing the pericardium to stick to the heart, also known as obliterative or fibrotic pericarditis. For chronic constrictive pericarditis (I31.1), synonyms like effusive or viral constrictive pericarditis help clarify this condition where the pericardium becomes thick and restricts heart function. Hemopericardium (I31.2) refers to blood accumulation in the pericardial sac. Codes like I31.3 and I31.39 capture noninflammatory pericardial effusions, including malignant causes (I31.31) and post-surgical fluid build-up. The serious complication of cardiac tamponade (I31.4) is also included, indicating pressure on the heart due to fluid accumulation. Other specified pericardial diseases and unspecified conditions are classified under I31.8 and I31.9 respectively, covering cysts, tumor-related pericarditis, and varied other pericardial disorders. These specific ICD-10 codes provide crucial guidance for medical coding and patient care related to pericardial diseases.
Questions About This Page
How many billable codes are in the I31 range?
Of the 10 codes in this range, 8 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 I31 range classify?
The range classifies other diseases of pericardium. 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.
