Other and unspecified disorders of circulatory system
In Other and unspecified disorders of the circulatory system (I95-I99), chapter 9: Diseases of the Circulatory System
2 billable codes under I99: none are a CC or MCC; none map to an HCC.
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.
- Hypertension (page 50)
- Atherosclerotic Coronary Artery Disease and Angina (page 52)
- Intraoperative and Postprocedural Cerebrovascular Accident (page 53)
- Sequelae of Cerebrovascular Disease (page 53)
- Acute myocardial infarction (AMI) (page 54)
All codes under I99
I99 can't be used on a claim. Pick a billable code below; grey headings group them.
I99 MS-DRGs
As the principal diagnosis, the billable codes under I99 group to MS-DRG 302, 303, 152, or 153 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 302 Atherosclerosis with MCC (2 of 2 codes)
- DRG 303 Atherosclerosis without MCC (2 of 2 codes)
- DRG 152 Otitis Media and URI with MCC (1 of 2 codes)
- DRG 153 Otitis Media and URI without MCC (1 of 2 codes)
Other codes that refer to I99
Notes on these codes point to I99.
Code history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.