2026 ICD-10-CM Diagnosis Code T54.2X1SToxic effect of corrosive acids and acid-like substances, accidental (unintentional), sequela
T54.2X1S is a billable ICD-10-CM diagnosis code for toxic effect of corrosive acids and acid-like substances, accidental (unintentional), 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
Code Classification
Present on Admission (POA)Billing
T54.2X1S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Accidental burning caused by acid
- Accidental burning caused by vitriol burning
- Accidental poisoning by acids
- Accidental poisoning by hydrochloric acid
- Accidental poisoning by nitric acid
- Accidental poisoning by sulfuric acid
- Accidental poisoning caused by fluoroacetic acid
- Acid chemical burn of conjunctival sac
- Acid chemical burn of cornea
- Acid chemical burn of cornea and conjunctival sac
- Acid chemical burn of cornea AND/OR conjunctival sac
- Burn of conjunctival sac
- Burn of cornea and conjunctival sac
- Burning caused by battery acid
- Burning caused by caustic acid
- Burning caused by hydrochloric acid
- Burning caused by hydrofluoric acid
- Burning caused by nitric acid
- Burning caused by sulfuric acid
- Chemical burn injury to conjunctiva
- Chemical burn of face
- Chemical injury to cornea
- Fluoroacetic acid poisoning
- Toxic effect of acid
- Toxic effect of hydrochloric acid
- Toxic effect of nitric acid
- Toxic effect of sulfuric acid
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Toxic effect of corrosive substances (T54). 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.
Clinical InformationClinical
Oxalates
derivatives of oxalic acid. included under this heading are a broad variety of acid forms, salts, esters, and amides that are derived from the ethanedioic acid structure.Oxalic Acid
a strong dicarboxylic acid occurring in many plants and vegetables. it is produced in the body by metabolism of glyoxylic acid or ascorbic acid. it is not metabolized but excreted in the urine. it is used as an analytical reagent and general reducing agent.
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.
| Substance | Accidental | Self-harm | Assault | Undetermined | Adverse Effect | Underdosing |
|---|---|---|---|---|---|---|
| Acetic | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Acetic::acid | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Acetic::acid::with sodium acetate (ointment) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Acetic::acid::ester (solvent) (vapor) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Acetic::acid::irrigating solution | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Acetic::acid::medicinal (lotion) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Acetic::anhydride | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Acetic::ether (vapor) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Acid (corrosive) NEC | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Aqua fortis | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Battery acid or fluid | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Formic acid | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Formic acid::vapor | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Hydrazoic acid, azides | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Hydrochloric acid (liquid) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Hydrochloric acid (liquid)::medicinal (digestant) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Hydrochloric acid (liquid)::vapor | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Hydrofluoric acid (liquid) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Hydrofluoric acid (liquid)::vapor | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Mineral | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Mineral::acids | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Mineral::oil (laxative) (medicinal) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Mineral::oil (laxative) (medicinal)::emulsion | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Mineral::oil (laxative) (medicinal)::nonmedicinal | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Mineral::oil (laxative) (medicinal)::topical | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Mineral::salt NEC | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Mineral::spirits | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitric | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitric::acid (liquid) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitric::acid (liquid)::vapor | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitric::oxide (gas) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitrohydrochloric acid | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitrous | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitrous::acid (liquid) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitrous::acid (liquid)::fumes | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitrous::ether spirit | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Nitrous::oxide | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Orthotolidine (reagent) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Osmic acid (liquid) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Osmic acid (liquid)::fumes | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Oxalic acid | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Oxalic acid::ammonium salt | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Phosphoric acid | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Picric (acid) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Saniflush (cleaner) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Storage battery (cells) (acid) | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Sulfuric acid | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Trichloroacetic acid, Trichloracetic acid | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
| Trichloroacetic acid, Trichloracetic acid::medicinal | T54.2X1 | T54.2X2 | T54.2X3 | T54.2X4 | – | – |
Convert T54.2X1S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T54.2X1SOverview
Is T54.2X1S a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of corrosive acids and acid-like substances, accidental (unintentional), sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T54.2X1S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the toxic effect of corrosive acids and acid-like substances, accidental (unintentional) itself has resolved, not the original event.
What MS-DRG does T54.2X1S group to?
When toxic effect of corrosive acids and acid-like substances, accidental (unintentional), 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 T54.2X1S 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 toxic effect of corrosive acids and acid-like substances, accidental (unintentional), sequela on inpatient claims.
What is the ICD-9 equivalent of T54.2X1S?
Under the General Equivalence Mappings, toxic effect of corrosive acids and acid-like substances, accidental (unintentional), sequela converts to ICD-9-CM 909.1 (late eff nonmed substanc). 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.
