2026 ICD-10-CM Diagnosis Code S00.12XAContusion of left eyelid and periocular area, initial encounter
S00.12XA is a billable ICD-10-CM diagnosis code for contusion 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 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Superficial injury; contusion, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Contusion of eyelid
- Contusion of left eye region
- Contusion of left eyelid
- Contusion of left lower eyelid
- Contusion of left upper eyelid
- Contusion of periorbital region
- Hematoma of eyelid
- Hematoma of left eye region
- Hematoma of left lower eyelid
- Hematoma of left upper eyelid
- Hematoma of lower eyelid
- Hematoma of upper eyelid
- Hemorrhage of eyelid
- Left periocular contusion
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Superficial injury of head (S00). 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
Eye Injuries
The structure of your face helps protect your eyes from injury. Still, injuries can damage your eye, sometimes severely enough that you could lose your vision. Most eye injuries are preventable. If you play sports or work in certain jobs, you may need protection.
Read the full article at MedlinePlus
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Convert S00.12XA to ICD-9-CMHistory
Code HistoryHistory
Questions About S00.12XAOverview
Is S00.12XA (Contusion of left eyelid and periocular area) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report contusion of left eyelid and periocular area, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S00.12XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for contusion of left eyelid and periocular area, such as an emergency visit or first evaluation.
What MS-DRG does S00.12XA group to?
When contusion of left eyelid and periocular area, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, 963, 964, 965, with relative weights from 0.7678 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S00.12XA?
Under the General Equivalence Mappings, contusion of left eyelid and periocular area, initial encounter converts to ICD-9-CM 921.0 (black eye NOS) and 921.1 (contusion periocular). 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.
