Rheumatic fever without heart involvement
In Acute rheumatic fever (I00-I02), chapter 9: Diseases of the Circulatory System
- I00 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under I00-I02 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
Also indexed as: Erythema, marginatum, in acute rheumatic fever; Fever, rheumatic; Pneumonia, in, rheumatic fever; Pneumonia, rheumatic; Rheumatic, pneumonia
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Instructional notes
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)
Other codes under I00-I02
Acute rheumatic fever (I00-I02)
- I00Rheumatic fever without heart involvement(this code)
- I01Rheumatic fever with heart involvement
- I02Rheumatic chorea
I00 MS-DRGs
As the principal diagnosis, I00 groups to MS-DRG 545, 546, or 547 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
I00 is in Acute rheumatic heart disease (CIR002, its default category), with 8 codes. Others in it:
I00 is in Bacterial infections (INF003), with 398 codes. Others in it:
Medicare coverage articles listing I00
This Medicare billing and coding article lists I00 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
Other codes that refer to I00
Notes on these codes point to I00.
- I01.0 Includes: Any condition in I00 with pericarditis
- I01.1 Includes: Any condition in I00 with endocarditis or valvulitis
- I01.2 Includes: Any condition in I00 with myocarditis
- I01.8 Includes: Any condition in I00 with other or multiple types of heart involvement
- I01.9 Includes: Any condition in I00 with unspecified type of heart involvement
- I51 Excludes2: heart disease specified as rheumatic (I00-I09)
- J09-J18 Excludes2: rheumatic pneumonia (I00)
- J17 Code First: rheumatic fever (I00)
- M02 Excludes1: rheumatic fever (I00)
- M05 Excludes1: rheumatic fever (I00)
- O99.4 Includes: Conditions in I00-I99
- P00.3 Includes: Newborn affected by maternal conditions classifiable to I00-I99, J00-J99, Q20-Q34 and not included in P00.0, P00.2
- Z82.4 Includes: Conditions classifiable to I00-I5A, I65-I99
- Z86.7 Includes: Conditions classifiable to I00-I99
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.
Read more about streptococcal infections on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 390 Rheumatic fever without mention of heart involvement