What does ICD-10 code I01 mean?

ICD-10 code I01 is the standardized code used for rheumatic fever with heart involvement in medical records and coding systems.

When is ICD-10 code I01 used?

Doctors, hospitals, and insurers may use ICD-10 code I01 when recording rheumatic fever with heart involvement in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code I01 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code I01: Rheumatic fever with heart involvement

Name: ICD-10 Code I01: Rheumatic fever with heart involvement
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:12:38.332Z

I01 is an ICD-10 diagnosis entry used to group records related to Rheumatic fever with heart involvement. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

When is it used?

May be used when a clinician documents rheumatic fever with heart involvement in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

9Diseases of the circulatory system (I00-I99)

block

I00-I02Acute rheumatic fever

currentI00-I02

Official coding notes

Excludes1 (do not code together)

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.

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

CardiologistGeneral PhysicianENT Specialist

Sibling codes

I00Rheumatic fever without heart involvementbillable I02Rheumatic chorea

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

I01

Replacement codes

I01.0 — Acute rheumatic pericarditisI01.1 — Acute rheumatic endocarditisI01.2 — Acute rheumatic myocarditisI01.8 — Other acute rheumatic heart diseaseI01.9 — Acute rheumatic heart disease, unspecified

Common synonyms

Rheumatic fever with heart involvement

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.