T49.4X — Poisoning by, adverse effect of and underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations

Not billable

Is T49.4X billable?

No — T49.4X is a non-billable header code. T49.4X groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 18 billable codes beneath T49.4X.

Billable codes under this header

T49.4X1APoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional), initial encounter
T49.4X1DPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional), subsequent encounter
T49.4X1SPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional), sequela
T49.4X2APoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm, initial encounter
T49.4X2DPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm, subsequent encounter
T49.4X2SPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm, sequela
T49.4X3APoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, initial encounter
T49.4X3DPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, subsequent encounter
T49.4X3SPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela
T49.4X4APoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, initial encounter
T49.4X4DPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, subsequent encounter
T49.4X4SPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, sequela
T49.4X5AAdverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations, initial encounter
T49.4X5DAdverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations, subsequent encounter
T49.4X5SAdverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations, sequela
T49.4X6AUnderdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations, initial encounter
T49.4X6DUnderdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations, subsequent encounter
T49.4X6SUnderdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations, sequela

T49.4X at a glance

Code	T49.4X
Description	Poisoning by, adverse effect of and underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes1 — never code together — inherited from T36-T50

The conditions below can never be reported together with T49.4X on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

toxic reaction to local anesthesia in pregnancy (O29.3-)

Code first — inherited from T36-T50

The underlying condition below must be sequenced before T49.4X. T49.4X describes a manifestation and cannot be the principal or first-listed diagnosis.

, for adverse effects, the nature of the adverse effect, such as:
adverse effect NOS (T88.7)
aspirin gastritis (K29.-)
blood disorders (D56-D76)
contact dermatitis (L23-L25)
dermatitis due to substances taken internally (L27.-)
nephropathy (N14.0-N14.2)

Use additional code — inherited from Chapter 19

Report an additional code alongside T49.4X to fully describe the condition. T49.4X is sequenced first.

code to identify any retained foreign body, if applicable (Z18.-)

Use additional code — inherited from T36-T50

Report an additional code alongside T49.4X to fully describe the condition. T49.4X is sequenced first.

code(s) to specify:
manifestations of poisoning
underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
underdosing of medication regimen (Z91.12-, Z91.13-)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of T49.4X, but a patient may have both at the same time. When documentation supports it, T49.4X and the excluded code may both be reported.

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from T36-T50

The conditions below are not part of T49.4X, but a patient may have both at the same time. When documentation supports it, T49.4X and the excluded code may both be reported.

abuse and dependence of psychoactive substances (F10-F19)
abuse of non-dependence-producing substances (F55.-)
immunodeficiency due to drugs (D84.821)
drug reaction and poisoning affecting newborn (P00-P96)
pathological drug intoxication (inebriation) (F10-F19)

What codes fall under T49.4X? (6)

How long has T49.4X existed?

T49.4X has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.