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ICD-10 Code I00: Rheumatic fever without heart involvement

I00 is a billable ICD-10 diagnosis code used to classify Rheumatic fever without heart involvement in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. 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 without heart involvement in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

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.

Code hierarchy

chapter
9Diseases of the circulatory system (I00-I99)
block
I00-I02Acute rheumatic fever
currentI00-I02

Official coding notes

Includes
  • arthritis, rheumatic, acute or subacute
Excludes1 (do not code together)
  • rheumatic fever with heart involvement (I01.0 -I01.9)

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

CardiologistGeneral PhysicianENT Specialist

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
I00

Common synonyms

Rheumatic fever without heart involvement

Frequently asked questions

Code details

CodeI00
SystemICD10
Display nameRheumatic fever without heart involvement
ChapterDiseases of the circulatory system (I00-I99)
BlockAcute rheumatic fever

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Erythema, erythematous(infectional) (inflammation)Fever(inanition) (of unknown origin) (persistent) (with chills) (with rigor)Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)Rheumatic(acute) (subacute)

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.

ICD-10 Code I00 for Rheumatic fever without heart involvement | HealthAssure