Is ICD-10-CM code I01 billable?

No, I01 (Rheumatic fever with heart involvement) 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 I01 belong to?

I01 belongs to Chapter 9 of the ICD-10-CM tabular list: I00–I99 (Diseases of the Circulatory System).

I01Not billable, use a more specific code below

Rheumatic fever with heart involvement

In Acute rheumatic fever (I00-I02), chapter 9: Diseases of the Circulatory System

5 billable codes under I01: all are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

Also indexed as: Fever, rheumatic, active with heart involvement

Instructional notes

Excludes1: not coded here, use a different code

chronic diseases of rheumatic origin (I05-I09) unless rheumatic fever is also present or there is evidence of reactivation or activity of the rheumatic process.

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 I01

I01 can't be used on a claim. Pick a billable code below; grey headings group them.

I01 MS-DRGs

As the principal diagnosis, the billable codes under I01 group to MS-DRG 314, 315, 316, 306, or 307 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

DRG 314 Other Circulatory System Diagnoses with MCC (4 of 5 codes)
DRG 315 Other Circulatory System Diagnoses with CC (4 of 5 codes)
DRG 316 Other Circulatory System Diagnoses without CC/MCC (4 of 5 codes)
DRG 306 Cardiac Congenital and Valvular Disorders with MCC (1 of 5 codes)
DRG 307 Cardiac Congenital and Valvular Disorders without MCC (1 of 5 codes)

Other codes that refer to I01

Notes on these codes point to I01.

I02.0 Includes: Rheumatic chorea with heart involvement of any type classifiable under I01.-

About the condition

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

Streptococcal Infections

Strep is short for Streptococcus, a type of bacteria that often lives in your nose and throat. Most strep infections are mild, but some may become serious depending on your overall health.

Code history

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