I51.8

Non-billable

Other ill-defined heart diseases

I51.8 is the ICD-10-CM code for Other ill-defined heart diseases. It is a non-billable category code — use a more specific child code such as I51.81 for billing.

Status
Header (non-billable)
Chapter
I00-I99
Parent
I51
Subcodes
2
Edition
FY2026

I00-I99 Diseases of the circulatory system

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code I51.8?
I51.8 is the ICD-10-CM code for "Other ill-defined heart diseases". It falls under I00-I99 Diseases of the circulatory system.
Is I51.8 a billable code?
No — I51.8 is a non-billable header code. Use a more specific child code (such as I51.81) for billing.
What are the subcodes of I51.8?
I51.8 has 2 more specific child codes, including I51.81, I51.89.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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