I63.3 – Cerebral infarction due to thrombosis of cerebral arteries

ICD-10-CM 2027 diagnosis code · Cerebrovascular diseases

Non-billable header

ICD-10-CM code I63.3

Code: I63.3 (claims format: I633)
Description: Cerebral infarction due to thrombosis of cerebral arteries
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: I60-I69 Cerebrovascular diseases
Parent codes: I63

Billable codes under I63.3

I63.3 is a header code and cannot be used on claims. Choose the most specific code:

I63.30 – Cerebral infarction due to thrombosis of unspecified cerebral arteryBillable
I63.31 – Cerebral infarction due to thrombosis of middle cerebral arteryHeader (more codes below)
I63.32 – Cerebral infarction due to thrombosis of anterior cerebral arteryHeader (more codes below)
I63.33 – Cerebral infarction due to thrombosis of posterior cerebral arteryHeader (more codes below)
I63.34 – Cerebral infarction due to thrombosis of cerebellar arteryHeader (more codes below)
I63.39 – Cerebral infarction due to thrombosis of other cerebral arteryBillable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I63 – Cerebral infarction

Includes:

occlusion and stenosis of cerebral and precerebral arteries, resulting in cerebral infarction

Excludes1 (not coded here):

neonatal cerebral infarction (P91.82-)

Excludes2 (not included here):

chronic, without residual deficits (sequelae) (Z86.73)
sequelae of cerebral infarction (I69.3-)

Use additional code:

code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)

Block I60-I69

Excludes1 (not coded here):

traumatic intracranial hemorrhage (S06.-)

Use additional code:

code to identify presence of:
alcohol abuse and dependence (F10.-)
exposure to environmental tobacco smoke (Z77.22)
history of tobacco dependence (Z87.891)
hypertension (I10-I1A)
occupational exposure to environmental tobacco smoke (Z57.31)
tobacco dependence (F17.-)
tobacco use (Z72.0)

Index terms for I63.3

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in I63

Frequently asked questions

What is ICD-10 code I63.3?

I63.3 is the ICD-10-CM code for cerebral infarction due to thrombosis of cerebral arteries, in the block I60-I69 (Cerebrovascular diseases).

Is I63.3 a billable code?

No. I63.3 is a header code with more specific child codes; report one of the billable codes listed above.

What category does I63.3 belong to?

It belongs to category I63 – Cerebral infarction.

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.