2026 ICD-10-CM Diagnosis Code T26.40XSBurn of unspecified eye and adnexa, part unspecified, sequela
T26.40XS is a billable ICD-10-CM diagnosis code for burn of unspecified eye and adnexa, part unspecified, 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 604 through 605. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T26.40XS 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.
- Burn confined to eye and adnexa
- Burn of eye proper
- Burn of eye region
- Burn of eye region with epidermal burn of face
- Burn of eye region with epidermal burn of head and/or neck
- Burn of eye region with full thickness burn of face
- Burn of eye region with full thickness burn of head and/or neck
- Burn of eye region with partial thickness burn of face
- Burn of eye region with partial thickness burn of head and/or neck
- Burn of ocular adnexa
- Burn of skin of eye region
- Deep third degree burn of eye region
- Deep third degree burn of face
- Deep third degree burn of head
- Flash burn of eye
- Full thickness burn of periorbital region
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 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 T26.40XS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T26.40XSOverview
Is T26.40XS (Burn of unspecified eye and adnexa, part unspecified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report burn of unspecified eye and adnexa, part unspecified, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T26.40XS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the burn of unspecified eye and adnexa, part unspecified itself has resolved, not the original event.
What MS-DRG does T26.40XS group to?
When burn of unspecified eye and adnexa, part unspecified, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, with relative weights from 0.9160 to 1.4721 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T26.40XS 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 burn of unspecified eye and adnexa, part unspecified, sequela on inpatient claims.
What is the ICD-9 equivalent of T26.40XS?
Under the General Equivalence Mappings, burn of unspecified eye and adnexa, part unspecified, sequela converts to ICD-9-CM 906.8 (late effect of burns NEC). 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.
