Nonrheumatic mitral valve disorders (I34) ICD-10-CM
The I34 code range covers nonrheumatic mitral valve disorders with 8 ICD-10-CM diagnosis codes. 6 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.
- mitral valve disease I05.9
- mitral valve failure I05.8
- mitral valve stenosis I05.0
- mitral valve disorder of unspecified cause with diseases of aortic and/or tricuspid valves I08
- mitral valve disorder of unspecified cause with mitral stenosis or obstruction I05.0
- mitral valve disorder specified as congenital Q23.2 Q23.9
- mitral valve disorder specified as rheumatic I05
Codes in the I34 Range 8 codes · 6 billable
- I34 Nonrheumatic mitral valve disordersNon-billable
- I34.0 Nonrheumatic mitral (valve) insufficiency
- I34.1 Nonrheumatic mitral (valve) prolapse
- I34.2 Nonrheumatic mitral (valve) stenosis
- I34.8 Other nonrheumatic mitral valve disordersNon-billable
- I34.81 Nonrheumatic mitral (valve) annulus calcification
- I34.89 Other nonrheumatic mitral valve disorders
- I34.9 Nonrheumatic mitral valve disorder, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I34 range.
Mitral Valve Prolapse
Abnormal protrusion or billowing of one or both of the leaflets of MITRAL VALVE into the LEFT ATRIUM during SYSTOLE. This allows the backflow of blood into left atrium leading to MITRAL VALVE INSUFFICIENCY; SYSTOLIC MURMURS; or CARDIAC ARRHYTHMIA.
About the I34 Code Range
The ICD-10 code for nonrheumatic mitral valve disorders (I34) covers various conditions affecting the mitral valve that are not caused by rheumatic fever. This series includes issues like mitral valve insufficiency, prolapse, stenosis, annulus calcification, and other specified or unspecified nonrheumatic mitral valve diseases.
These codes are used specifically to classify problems such as mitral regurgitation (I34.0), often referred to as mitral valve insufficiency, which involves backward blood flow due to valve leakage. It encompasses causes like acute myocardial infarction and functional mitral regurgitation. The code I34.1 covers mitral valve prolapse, a condition known by synonyms like familial or degenerative mitral valve prolapse, where valve leaflets bulge into the left atrium. For mitral stenosis without rheumatic origin, I34.2 captures valve narrowing and includes complications like prosthetic valve obstruction and calcification. Other specific codes such as I34.81 and I34.89 detail annulus calcification and a variety of rare or complex mitral valve abnormalities. When a nonrheumatic mitral valve disorder is diagnosed but not further specified, code I34.9 is applied. These detailed codes assist medical coders in accurately documenting such conditions for billing, treatment planning, and epidemiologic tracking.
Questions About This Page
How many billable codes are in the I34 range?
Of the 8 codes in this range, 6 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 I34 range classify?
The range classifies nonrheumatic mitral valve disorders. 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.
