I99: Other and unspecified disorders of circulatory system
Codes under I99 (Other and unspecified disorders of circulatory system). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| I99.8 | Other disorder of circulatory system | ✓ |
| I99.8 | Other disorder of circulatory system | ✓ |
| I99.9 | Unspecified disorder of circulatory system | ✓ |
| I99.9 | Unspecified disorder of circulatory system | ✓ |
Frequently asked questions
What is ICD-10-CM code I99?
I99 is an ICD-10-CM category covering Other and unspecified disorders of circulatory system. It contains 4 more specific diagnosis codes, 4 of which are billable.
Is I99 a billable code?
No — I99 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example I99.8 — Other disorder of circulatory system). 4 of the 4 codes under I99 are billable.
What codes fall under I99?
I99 includes I99.8, I99.8, I99.9, I99.9. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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