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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

What this means — in plain language

MedlinePlus · NIH

What is heart disease? Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease. Heart disease is the leading cause of death in the United States, but there are ways to prevent and manage many types of heart disease. What are the types of heart disease? There are many different types of heart disease. Some you may be…

Read more about Heart Diseases at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

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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