Other and unspecified disorders of circulatory system (I99) ICD-10-CM
The I99 code range covers other and unspecified disorders of circulatory system with 3 ICD-10-CM diagnosis codes. 2 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the I99 Range 3 codes · 2 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I99 range.
Cardiovascular Disorder
A non-neoplastic or neoplastic disorder affecting the heart or the vessels (arteries, veins and lymph vessels). Representative examples of non-neoplastic cardiovascular disorders are endocarditis and hypertension. Representative examples of neoplastic cardiovascular disorders are endocardial myxoma and angiosarcoma.
Ischemia
A hypoperfusion of the BLOOD through an organ or tissue caused by a PATHOLOGIC CONSTRICTION or obstruction of its BLOOD VESSELS, or an absence of BLOOD CIRCULATION.
About the I99 Code Range
These codes describe disorders involving blood circulation that are labeled other or unspecified.
I99.8 identifies an other circulatory disorder. I99.9 identifies an unspecified circulatory disorder.
Questions About This Page
How many billable codes are in the I99 range?
Of the 3 codes in this range, 2 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the I99 range classify?
The range classifies other and unspecified disorders of circulatory system. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
