I63.03 – Cerebral infarction due to thrombosis of carotid artery

ICD-10-CM 2027 diagnosis code · Cerebrovascular diseases

Non-billable header

ICD-10-CM code I63.03
Code
I63.03 (claims format: I6303)
Description
Cerebral infarction due to thrombosis of carotid artery
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 › I63.0

Billable codes under I63.03

I63.03 is a header code and cannot be used on claims. Choose the most specific code:

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 I63.03

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

Related codes in I63.0

Frequently asked questions

What is ICD-10 code I63.03?

I63.03 is the ICD-10-CM code for cerebral infarction due to thrombosis of carotid artery, in the block I60-I69 (Cerebrovascular diseases).

Is I63.03 a billable code?

No. I63.03 is a header code with more specific child codes; report one of the billable codes listed above.

What category does I63.03 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.