Is T38.1 a billable ICD-10 code?

No. T38.1 is a non-billable header code. Use a more specific subcategory for claims.

T38.1 ⚠ Non-billable

Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes

Q: What is ICD-10 code T38.1?

ICD-10-CM code T38.1 stands for "Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes". It is a non-billable header code in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Injury, Poisoning and Certain Other Consequences of External Causes

Code

T38.1

System

ICD-10-CM

Billable

No — use specific code

Effective

FY2026

Chapter

Injury, Poisoning and Certain Other Consequences of External Causes

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 T38.1?

ICD-10-CM code T38.1 represents Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes. It is a non-billable header code requiring a more specific subcategory in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective October 1, 2025 – September 30, 2026.

Is T38.1 billable?

No. T38.1 is a non-billable header. Select a more specific subcategory for claims submission.

What chapter is T38.1 in?

T38.1 belongs to the Injury, Poisoning and Certain Other Consequences of External Causes chapter (S00–T88) of ICD-10-CM.

Related codes in the T38 category

T38 Poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classified Non-billable T38.0 Poisoning by, adverse effect of and underdosing of glucocorticoids and synthetic analogues Non-billable T38.0X Poisoning by, adverse effect of and underdosing of glucocorticoids and synthetic analogues Non-billable T38.1X Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes Non-billable T38.0X1 Poisoning by glucocorticoids and synthetic analogues, accidental (unintentional) Non-billable T38.0X2 Poisoning by glucocorticoids and synthetic analogues, intentional self-harm Non-billable T38.0X3 Poisoning by glucocorticoids and synthetic analogues, assault Non-billable T38.0X4 Poisoning by glucocorticoids and synthetic analogues, undetermined Non-billable

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