2026 ICD-10-CM Diagnosis Code I99Other and unspecified disorders of circulatory system

ICD-10-CM Codes›I00–I99›I95-I99›I99

ICD-10-CM I99
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I99 is a non-billable ICD-10-CM category code for other and unspecified disorders of circulatory system, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I99.8 and I99.9.

Code Identity

ICD-10-CM Code
I99
Billable Status
No — Non-Billable Category
Code Describes
Other and unspecified disorders of circulatory system
Chapter
I95-I99
Other and unspecified disorders of the circulatory system

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI95-I99Other and unspecified disorders of the circulatory system
CategoryI99Other and unspecified disorders of circulatory system
This CodeI99Other and unspecified disorders of circulatory system

Specific Coding for Other and unspecified disorders of circulatory systemOverview

Non-specific codes like I99 require more characters. Use one of these billable codes instead:

  • Use I99.8 for Other disorder of circulatory system

  • Use I99.9 for Unspecified disorder of circulatory system

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I99Overview

Is I99 (Other and unspecified disorders of circulatory system) a billable code?

No. This is a category header that groups the codes for other and unspecified disorders of circulatory system, and headers cannot be submitted on claims. Claims for other and unspecified disorders of circulatory system need a more specific code from this category, such as I99.8 and I99.9.