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ICD-10-CM · FY 2026 APRIL UPDATE

T38.1X

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

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
T38.1X1Poisoning by thyroid hormones and substitutes, accidental (unintentional)Category
T38.1X1APoisoning by thyroid hormones and substitutes, accidental (unintentional), initial encounterBillable
T38.1X1DPoisoning by thyroid hormones and substitutes, accidental (unintentional), subsequent encounterBillable
T38.1X1SPoisoning by thyroid hormones and substitutes, accidental (unintentional), sequelaBillable
T38.1X2Poisoning by thyroid hormones and substitutes, intentional self-harmCategory
T38.1X2APoisoning by thyroid hormones and substitutes, intentional self-harm, initial encounterBillable
T38.1X2DPoisoning by thyroid hormones and substitutes, intentional self-harm, subsequent encounterBillable
T38.1X2SPoisoning by thyroid hormones and substitutes, intentional self-harm, sequelaBillable
T38.1X3Poisoning by thyroid hormones and substitutes, assaultCategory
T38.1X3APoisoning by thyroid hormones and substitutes, assault, initial encounterBillable
T38.1X3DPoisoning by thyroid hormones and substitutes, assault, subsequent encounterBillable
T38.1X3SPoisoning by thyroid hormones and substitutes, assault, sequelaBillable
T38.1X4Poisoning by thyroid hormones and substitutes, undeterminedCategory
T38.1X4APoisoning by thyroid hormones and substitutes, undetermined, initial encounterBillable
T38.1X4DPoisoning by thyroid hormones and substitutes, undetermined, subsequent encounterBillable
T38.1X4SPoisoning by thyroid hormones and substitutes, undetermined, sequelaBillable
T38.1X5Adverse effect of thyroid hormones and substitutesCategory
T38.1X5AAdverse effect of thyroid hormones and substitutes, initial encounterBillable
T38.1X5DAdverse effect of thyroid hormones and substitutes, subsequent encounterBillable
T38.1X5SAdverse effect of thyroid hormones and substitutes, sequelaBillable
T38.1X6Underdosing of thyroid hormones and substitutesCategory
T38.1X6AUnderdosing of thyroid hormones and substitutes, initial encounterBillable
T38.1X6DUnderdosing of thyroid hormones and substitutes, subsequent encounterBillable
T38.1X6SUnderdosing of thyroid hormones and substitutes, sequelaBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.