ICD10BillableValid for clinical use

ICD-10 Code T38.1X4: Poisoning by thyroid hormones and substitutes, undetermined

T38.1X4 is a billable ICD-10 diagnosis code used to classify Poisoning by thyroid hormones and substitutes, undetermined in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Injury, poisoning and certain other consequences of external causes (S00-T88).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Injury, poisoning and certain other consequences of external causes (S00-T88).

When is it used?

  • May be used when a clinician documents poisoning by thyroid hormones and substitutes, undetermined in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
19Injury, poisoning and certain other consequences of external causes (S00-T88)
block
T07-T88Injury, poisoning and certain other consequences of external causes
block
T36-T50Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances
category
T38Poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classified
category
T38.1Poisoning by, adverse effect of and underdosing of thyroid hormones and substitutes
category
T38.1XPoisoning by, adverse effect of and underdosing of thyroid hormones and substitutes
currentT38.1X

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Emergency Medicine SpecialistOrthopedic SpecialistEndocrinologist

Coding guidelines

Common synonyms

Poisoning by thyroid hormones and substitutes, undetermined

Frequently asked questions

Code details

CodeT38.1X4
SystemICD10
Display namePoisoning by thyroid hormones and substitutes, undetermined
ChapterInjury, poisoning and certain other consequences of external causes (S00-T88)
BlockPoisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code T38.1X4 for Poisoning by thyroid hormones and substitutes, undetermined | HealthAssure