Is ICD-10-CM code I34 billable?

No, I34 (Nonrheumatic mitral valve disorders) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code I34 belong to?

I34 belongs to Chapter 9 of the ICD-10-CM tabular list: I00–I99 (Diseases of the Circulatory System).

I34Not billable, use a more specific code below

Nonrheumatic mitral valve disorders

In Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System

6 billable codes under I34: none are a CC or MCC; none map to an HCC.

Instructional notes

Excludes1: not coded here, use a different code

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.-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.

Hypertension (page 50)
Atherosclerotic Coronary Artery Disease and Angina (page 52)
Intraoperative and Postprocedural Cerebrovascular Accident (page 53)
Sequelae of Cerebrovascular Disease (page 53)
Acute myocardial infarction (AMI) (page 54)

Read Section I.C.9 (page 50)

All codes under I34

I34 can't be used on a claim. Pick a billable code below; grey headings group them.

I34 MS-DRGs

As the principal diagnosis, all 6 billable codes under I34 group to MS-DRG 306 or 307 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to I34

Notes on these codes point to I34.

I05 Excludes1: mitral valve disease specified as nonrheumatic (I34.-)
I08 Excludes2: multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Heart Valve Diseases

Heart valve disease happens when one or more of your heart valves don't work well. Your heart has four valves: the tricuspid, pulmonary, mitral, and aortic valves. The valves have flaps that open and close. The flaps make sure that blood flows in the right direction through your heart and to the rest of your body. When your heart beats, the flaps open to let blood through. Between heartbeats they close to stop the blood from flowing backwards.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.