I99 – Other and unspecified disorders of circulatory system
ICD-10-CM 2027 diagnosis code · Other and unspecified disorders of the circulatory system
ICD-10-CM code
I99
- Code
I99(claims format:I99)- Description
- Other and unspecified disorders of circulatory system
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 9. Diseases of the circulatory system (I00-I99)
- Block
- I95-I99 Other and unspecified disorders of the circulatory system
Billable codes under I99
I99 is a header code and cannot be used on claims. Choose the most specific code:
Frequently asked questions
What is ICD-10 code I99?
I99 is the ICD-10-CM code for other and unspecified disorders of circulatory system, in the block I95-I99 (Other and unspecified disorders of the circulatory system).
Is I99 a billable code?
No. I99 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.