2026 ICD-10-CM Diagnosis Code I02.9Rheumatic chorea without heart involvement
ICD-10-CM Codes›I00–I99›I00-I02›I02
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
I02.9 is a billable ICD-10-CM diagnosis code for rheumatic chorea without heart involvement. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 34 closely related codes. Coders also document this condition as autoimmune movement disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute rheumatic heart disease and Bacterial infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Autoimmune movement disorder
- Chorea due to and following infective disorder
- Chorea due to immunological disorder
- Rheumatic chorea
- Rheumatic chorea without heart involvement
- Secondary tic disorder
- Tic disorder due to rheumatic chorea
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Rheumatic chorea NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Chorea (chronic) (gravis) (posthemiplegic) (senile) (spasmodic) G25.5
rheumatic I02.9
minor I02.9
rheumatic (chronic) I02.9
Sydenham's I02.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Movement Disorders
Movement disorders are neurologic conditions that cause problems with movement, such as:
Read the full article at MedlinePlus
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Convert I02.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I02.9Overview
What is the ICD-10 code for rheumatic chorea without heart involvement?
The ICD-10-CM code for rheumatic chorea without heart involvement is I02.9 (sometimes written as I029). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is I02.9 (Rheumatic chorea) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report rheumatic chorea without heart involvement on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does I02.9 group to?
When rheumatic chorea without heart involvement is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I02.9 a CC or MCC?
CMS lists I02.9 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 34 closely related codes in its exclusion list.
What is the ICD-9 equivalent of I02.9?
Under the General Equivalence Mappings, rheumatic chorea without heart involvement converts to ICD-9-CM 392.9 (rheumatic chorea NOS). The mapping is a direct match.
