2026 ICD-10-CM Diagnosis Code T49.4X3SPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela

ICD-10-CM Codes›S00–T88›T36-T50›T49

ICD-10-CM T49.4X3S
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T49.4X3S is a billable ICD-10-CM diagnosis code for poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Poisoning/toxic effect/adverse effects/underdosing, sequela.

Code Identity

ICD-10-CM Code
T49.4X3S
Billable Status
Yes — Valid for Submission
Code Describes
Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela
Short Description
Poisn by keratolyt/keratplst/hair trmt drug, asslt, sequela
Parent Code
T49.4X3
Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT36-T50Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
CategoryT49Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs
This CodeT49.4X3SPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela

Present on Admission (POA)Billing

T49.4X3S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Coding GuidelinesGuidance

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined). If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs (T49). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ075
Poisoning/toxic effect/adverse effects/underdosing, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Allantoin

    a urea hydantoin that is found in urine and plants and is used in dermatological preparations.

  • Anthralin

    an anthracene derivative that disrupts function and structure of mitochondria and is used for the treatment of dermatoses, especially psoriasis. it may cause folliculitis.

  • Capsaicin

    an alkylamide found in capsicum that acts at trpv cation channels.

  • Capsicum

    a plant genus of the family solanaceae. the hot peppers yield capsaicin, which activates vanilloid receptors. several varieties have sweet or pungent edible fruits that are used as vegetables when fresh and spices when the pods are dried.

  • Anacardic Acids

    a group of 6-alkyl salicylic acids that are found in anacardium and known for causing contact dermatitis.

  • Salicylates

    the salts or esters of salicylic acids, or salicylate esters of an organic acid. some of these have analgesic, antipyretic, and anti-inflammatory activities by inhibiting prostaglandin synthesis.

  • Salicylic Acid

    a compound obtained from the bark of the white willow and wintergreen leaves. it has bacteriostatic, fungicidal, and keratolytic actions.

Table of Drugs and ChemicalsClinical

Substances in the Table of Drugs and Chemicals that reference this code family. Always confirm in the Tabular List before coding.

SubstanceAccidentalSelf-harmAssaultUndeter­minedAdverse
Effect		Under­dosing
AllantoinT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Alum (medicinal)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Alum (medicinal)::nonmedicinal (ammonium) (potassium)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
AnthralinT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
AntiseborrheicsT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Bleaching agent (medicinal)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
ButantroneT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Cade oilT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
CapsicumT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Carbazochrome (salicylate) (sodium sulfonate)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
ChlorothymolT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
ChloroxineT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
ChrysarobinT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
CollagenaseT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Corn curesT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
DepilatoryT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Desloughing agentT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Diachylon plasterT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Dimethylamine sulfateT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
DithranolT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
EuresolT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Flowers of sulfurT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Fumaric acidT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
HairT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Hair::dyeT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Hair::preparation NECT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
HemostypticT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
IchthyolT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Keratolytic drug NECT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Keratolytic drug NEC::anthraceneT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Keratoplastic NECT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Lassar's pasteT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
MonobenzoneT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Podophyllum (resin)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Preparation, localT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Pyrithione zincT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
RubefacientT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Salicylic acidT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Salicylic acid::with benzoic acidT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Salicylic acid::congenersT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Salicylic acid::derivativeT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Salicylic acid::saltsT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Savin (oil)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
SelsunT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::acidT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::dioxide (gas)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::etherT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::hydrogenT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::medicinal (keratolytic) (ointment) NECT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::ointmentT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::pesticide (vapor)T49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::vapor NECT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
ThioglycolateT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
TioxoloneT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
TriacetoxyanthraceneT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
TrioxysalenT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
Vleminckx's solutionT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
XenysalateT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6

Patient EducationClinical

Poisoning

A poison is any substance that is harmful to your body. You might swallow it, inhale it, inject it, or absorb it through your skin. Any substance can be poisonous if too much is taken. Poisons can include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert T49.4X3S to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
909.0 Late eff drug poisoning
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
E969 Late effect assault
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T49.4X3SOverview

Is T49.4X3S a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in T49.4X3S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault itself has resolved, not the original event.

What MS-DRG does T49.4X3S group to?

When poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.

Is T49.4X3S exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela on inpatient claims.

What is the ICD-9 equivalent of T49.4X3S?

Under the General Equivalence Mappings, poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault, sequela converts to ICD-9-CM 909.0 (late eff drug poisoning) and E969 (late effect assault). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.