I34.1 — Nonrheumatic mitral (valve) prolapse
Is I34.1 billable?
Yes — I34.1 is billable for FY2027. I34.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. I34.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.
I34.1 at a glance
| Code | I34.1 |
|---|---|
| Description | Nonrheumatic mitral (valve) prolapse |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does I34.1 group to?
I34.1 sits in MDC 05 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 306Cardiac Congenital and Valvular Disorders with MCCmedical
- 307Cardiac Congenital and Valvular Disorders without MCCmedical
How is I34.1 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to I34.1. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Floppy › nonrheumatic mitral valve syndrome
- Prolapse, prolapsed › mitral
- Syndrome › floppy › mitral valve
Excludes1 — never code together
The conditions below can never be reported together with I34.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- Marfan's syndrome (Q87.4-)
Inclusion terms
Alternative wording in documentation that is classified to I34.1.
- Floppy nonrheumatic mitral valve syndrome
Excludes1 — never code together — inherited from I34
The conditions below can never be reported together with I34.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- 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 valve(s) (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.-)
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I34.1, but a patient may have both at the same time. When documentation supports it, I34.1 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
How long has I34.1 existed?
I34.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with I34.1?
ICD-10-CM declares these codes mutually exclusive with I34.1 — exactly one of each pair can be correct for a given encounter.