2026 ICD-10-CM Diagnosis Code S03.9XXASprain of joints and ligaments of unspecified parts of head, initial encounter
S03.9XXA is a billable ICD-10-CM diagnosis code for sprain of joints and ligaments of unspecified parts of head, 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 562 through 563, 963 through 965. Coders also document this condition as dislocations, sprains and strains involving head with neck. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sprains and strains, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Dislocations, sprains and strains involving head with neck
- Dislocations, sprains and strains involving multiple body regions
- Dislocations/sprains/strains
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Dislocation and sprain of joints and ligaments of head (S03). 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
Head Injuries
Chances are you've bumped your head before. Often, the injury is minor because your skull is hard and it protects your brain. But other head injuries can be more severe, such as a skull fracture, concussion, or traumatic brain injury.
Read the full article at MedlinePlus
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Convert S03.9XXA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S03.9XXAOverview
Is S03.9XXA (Sprain of joints and ligaments of unspecified parts of head) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report sprain of joints and ligaments of unspecified parts of head, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S03.9XXA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for sprain of joints and ligaments of unspecified parts of head, such as an emergency visit or first evaluation.
What MS-DRG does S03.9XXA group to?
When sprain of joints and ligaments of unspecified parts of head, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 562, 563, 963, 964, 965, with relative weights from 0.8955 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S03.9XXA?
Under the General Equivalence Mappings, sprain of joints and ligaments of unspecified parts of head, initial encounter converts to ICD-9-CM 848.8 (sprain 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.
