2027 ICD-10-CM Diagnosis Code T26.52XACorrosion of left eyelid and periocular area, initial encounter

ICD-10-CM Codes›S00–T88›T26-T28›T26

ICD-10-CM T26.52XA
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T26.52XA is a billable ICD-10-CM diagnosis code for corrosion of left eyelid and periocular area, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. Coders also document this condition as burn of left eyelid. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Burn and corrosion, initial encounter.

Code Identity

ICD-10-CM Code
T26.52XA
Billable Status
Yes — Valid for Submission
Code Describes
Corrosion of left eyelid and periocular area, initial encounter
Short Description
Corrosion of left eyelid and periocular area, init encntr
Parent Code
T26.52
Corrosion of left eyelid and periocular area

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT26-T28Burns and corrosions confined to eye and internal organs
CategoryT26Burn and corrosion confined to eye and adnexa
This CodeT26.52XACorrosion of left eyelid and periocular area, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Burn of left eyelid
  • Burn of left ocular adnexa
  • Chemical burn of eyelid
  • Chemical burn of left eyelid

Coding GuidelinesGuidance

The ICD-10-CM makes a distinction between burns and corrosions. The burn codes are for thermal burns, except sunburns, that come from a heat source, such as a fire or hot appliance. The burn codes are also for burns resulting from electricity and radiation. Corrosions are burns due to chemicals. The guidelines are the same for burns and corrosions.

Sequence first the code that reflects the highest degree of burn when more than one burn is present.

  • When the reason for the admission or encounter is for treatment of external multiple burns, sequence first the code that reflects the burn of the highest degree.
  • When a patient has both internal and external burns, the circumstances of admission govern the selection of the principal diagnosis or first-listed diagnosis.
  • When a patient is admitted for burn injuries and other related conditions such as smoke inhalation and/or respiratory failure, the circumstances of admission govern the selection of the principal or first-listed diagnosis.

Burns of the eye and internal organs (T26-T28) are classified by site, but not by degree.

Classify burns of the same local site (three-character category level, T20-T28) but of different degrees to the subcategory identifying the highest degree recorded in the diagnosis.

The appropriate 7th character is to be added to each code from block Burn and corrosion confined to eye and adnexa (T26). 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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T26.52XA: its own notes plus those printed at T26.5, T26, block T20-T32, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block T20-T32 applies to 2,584 codes
  • burns (thermal) from electrical heating appliances
  • burns (thermal) from electricity
  • burns (thermal) from flame
  • burns (thermal) from friction
  • burns (thermal) from hot air and hot gases
  • burns (thermal) from hot objects
  • burns (thermal) from lightning
  • burns (thermal) from radiation
  • chemical burn [corrosion] (external) (internal)
  • scalds

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block T20-T32 applies to 2,584 codes
  • erythema [dermatitis] ab igne (L59.0)
  • radiation-related disorders of the skin and subcutaneous tissue (L55-L59)
  • sunburn (L55.-)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Code First

The underlying condition named in the note is sequenced before this code.

From T26.5 Corrosion of eyelid and periocular area applies to 9 codes
  • (T51-T65) to identify chemical and intent

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From T26.5 Corrosion of eyelid and periocular area applies to 9 codes
  • external cause code to identify place (Y92)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From T26 Burn and corrosion confined to eye and adnexa applies to 90 codes
  • The appropriate 7th character is to be added to each code from category T26
Values for category T26 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T26.52XA, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming T26.52XA: they are not reported together with it, unless the two conditions are unrelated.

  • H10.21 Acute toxic conjunctivitis
    burn and corrosion of eye and adnexa (T26.-) names T26.-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming T26.52XA: its condition is not part of those codes, and both may be reported when the patient has both.

  • T20 Burn and corrosion of head, face, and neck
    burn and corrosion of eye and adnexa (T26.-) names T26.-, which includes this code

Clinical ClassificationClinical

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

CCSR INJ019
Burn and corrosion, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Burns

A burn is damage to your body's tissues caused by heat, chemicals, electricity, sunlight, or radiation. Scalds from hot liquids and steam, building fires and flammable liquids and gases are the most common causes of burns. Another kind is an inhalation injury, caused by breathing smoke.

Read the full article at MedlinePlus

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

Convert T26.52XA to ICD-9-CMHistory

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

ICD-9-CM
940.0 Chemical burn periocular
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About T26.52XAOverview

What is the ICD-10 code for corrosion of left eyelid and periocular area, initial encounter?

The ICD-10-CM code for corrosion of left eyelid and periocular area, initial encounter is T26.52XA (sometimes written as T2652XA). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is T26.52XA (Corrosion of left eyelid and periocular area) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report corrosion of left eyelid and periocular area, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in T26.52XA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for corrosion of left eyelid and periocular area, such as an emergency visit or first evaluation.

What MS-DRG does T26.52XA group to?

When corrosion of left eyelid and periocular area, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.

Does T26.52XA need an additional code?

When the condition applies, yes. The Use Additional Code note at T26.5, which applies to T26.52XA, reads: external cause code to identify place (Y92). The additional code is reported after T26.52XA.