I45.3
✓ Billable
Trifascicular block
ICD-10-CM · FY2026 · Diseases of the Circulatory System
Code
I45.3
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Circulatory System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code I45.3?
ICD-10-CM code I45.3 represents Trifascicular block. It is a billable diagnosis code in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.
Is I45.3 billable?
Yes. I45.3 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is I45.3 in?
I45.3 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.
Related codes in the I45 category
I45
Other conduction disorders
Non-billable
I45.0
Right fascicular block
Billable
I45.1
Other and unspecified right bundle-branch block
Non-billable
I45.2
Bifascicular block
Billable
I45.4
Nonspecific intraventricular block
Billable
I45.5
Other specified heart block
Billable
I45.6
Pre-excitation syndrome
Billable
I45.8
Other specified conduction disorders
Non-billable
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