ICD-10-CM 2027
ICD-10 code for mitral valve prolapse
From the official ICD-10-CM alphabetic index entry “Prolapse, prolapsed › mitral (valve)”. Page updated September 29, 2026.
About coding mitral valve prolapse
The ICD-10-CM code for mitral valve prolapse is I34.1 (Nonrheumatic mitral (valve) prolapse).
Within I34 (nonrheumatic mitral valve disorders), I34.1 is specifically for nonrheumatic mitral (valve) prolapse. Related codes cover nonrheumatic mitral (valve) insufficiency (I34.0), nonrheumatic mitral (valve) stenosis (I34.2), other nonrheumatic mitral valve disorders (I34.8) and nonrheumatic mitral valve disorder, unspecified (I34.9).
Don't report I34.1 together with the conditions in its Excludes1 note: Marfan's syndrome (Q87.4-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for I34.1)
- Marfan's syndrome (Q87.4-)
Common questions about mitral valve prolapse ICD-10 codes
What is the ICD-10 code for mitral valve prolapse?
- I34.1 — Nonrheumatic mitral (valve) prolapse.
Is I34.1 billable?
- Yes. I34.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I34.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I34.1 as a principal diagnosis.
Is I34.1 a CC or MCC?
- No. I34.1 is neither a CC nor an MCC under MS-DRG v44.0.