ICD-10-CM · FY 2026 APRIL UPDATE

T49.4

Poisoning by, adverse effect of and underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations

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

CODE	DESCRIPTION	TYPE
T49.4X	Poisoning by, adverse effect of and underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations	Category
T49.4X1	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional)	Category
T49.4X1A	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional), initial encounter	Billable
T49.4X1D	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional), subsequent encounter	Billable
T49.4X1S	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional), sequela	Billable
T49.4X2	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm	Category
T49.4X2A	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm, initial encounter	Billable
T49.4X2D	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm, subsequent encounter	Billable
T49.4X2S	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm, sequela	Billable
T49.4X3	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault	Category
T49.4X3A	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, initial encounter	Billable
T49.4X3D	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, subsequent encounter	Billable
T49.4X3S	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela	Billable
T49.4X4	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined	Category
T49.4X4A	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, initial encounter	Billable
T49.4X4D	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, subsequent encounter	Billable
T49.4X4S	Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, sequela	Billable
T49.4X5	Adverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations	Category
T49.4X5A	Adverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations, initial encounter	Billable
T49.4X5D	Adverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations, subsequent encounter	Billable
T49.4X5S	Adverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations, sequela	Billable
T49.4X6	Underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations	Category
T49.4X6A	Underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations, initial encounter	Billable
T49.4X6D	Underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations, subsequent encounter	Billable
T49.4X6S	Underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations, sequela	Billable

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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.

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