T45.AX5A
✓ BillableAdverse effect of immune checkpoint inhibitors and immunostimulant drugs, initial encounter
Injury, poisoning and certain other consequences of external causes (S00-T88)
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drug (T45.1)
Clinical Description
ICD-10-CM code T45.AX5A represents adverse effect of immune checkpoint inhibitors and immunostimulant drugs, initial encounter. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 8-character code at the 7th level of specificity. This is the most specific code available in this subcategory. Coders should note that T45.AX5A has 1 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code T45.AX5A?
ICD-10-CM code T45.AX5A is "Adverse effect of immune checkpoint inhibitors and immunostimulant drugs, initial encounter". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).
Is T45.AX5A a billable ICD-10 code?
Yes, T45.AX5A is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
What codes are excluded with T45.AX5A?
T45.AX5A has 1 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Related Codes in T45.AX5
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)