T38.90
⚠ Non-billable (Header)Poisoning by, adverse effect of and underdosing of unspecified hormone antagonists
Injury, poisoning and certain other consequences of external causes (S00-T88)
⚠️ This is a category header code — not billable. Use a more specific child code below.
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • mineralocorticoids and their antagonists (T50.0-)
- • oxytocic hormones (T48.0-)
- • parathyroid hormones and derivatives (T50.9-)
Child Codes (6)
Clinical Description
ICD-10-CM code T38.90 represents poisoning by, adverse effect of and underdosing of unspecified hormone antagonists. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.
This is a 6-character code at the 5th level of specificity. There are 6 more specific child codes under T38.90. Coders should note that T38.90 has 3 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code T38.90?
ICD-10-CM code T38.90 is "Poisoning by, adverse effect of and underdosing of unspecified hormone antagonists". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).
Is T38.90 a billable ICD-10 code?
No, T38.90 is a non-billable header code. A more specific child code must be used for billing.
What codes are excluded with T38.90?
T38.90 has 3 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Related Codes in T38.9
Other codes in the same category that may be relevant for differential coding:
🧪 Validate Combinations
Add T38.90 to the Excludes Checker to validate against your full code list.
Open in Checker →Code Information
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)