I51.8 — Other ill-defined heart diseases

Not billable

Is I51.8 billable?

No — I51.8 is a non-billable header code. I51.8 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 2 billable codes beneath I51.8.

Billable codes under this header

I51.8 at a glance

Code	I51.8
Description	Other ill-defined heart diseases
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes2 — not included here — inherited from Chapter 9

The conditions below are not part of I51.8, but a patient may have both at the same time. When documentation supports it, I51.8 and the excluded code may both be reported.

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
systemic connective tissue disorders (M30-M36)
transient cerebral ischemic attacks and related syndromes (G45.-)

Excludes2 — not included here — inherited from I51

The conditions below are not part of I51.8, but a patient may have both at the same time. When documentation supports it, I51.8 and the excluded code may both be reported.

heart disease specified as rheumatic (I00-I09)

What codes fall under I51.8? (2)

How long has I51.8 existed?

I51.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.