2026 ICD-10-CM Diagnosis Code S63.331ATraumatic rupture of right ulnocarpal (palmar) ligament, initial encounter
S63.331A is a billable ICD-10-CM diagnosis code for traumatic rupture of right ulnocarpal (palmar) ligament, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sprains and strains, initial encounter.
Code Identity
Code Classification
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Dislocation and sprain of joints and ligaments at wrist and hand level (S63). 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
Sprains and Strains
A sprain is a stretched or torn ligament. Ligaments are tissues that connect bones at a joint. Falling, twisting, or getting hit can all cause a sprain. Ankle and wrist sprains are common. Symptoms include pain, swelling, bruising, and being unable to move your joint. You might feel a pop or tear when the injury happens.
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Convert S63.331A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S63.331AOverview
Is S63.331A (Traumatic rupture of right ulnocarpal (palmar) ligament) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report traumatic rupture of right ulnocarpal (palmar) ligament, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S63.331A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for traumatic rupture of right ulnocarpal (palmar) ligament, such as an emergency visit or first evaluation.
What MS-DRG does S63.331A group to?
When traumatic rupture of right ulnocarpal (palmar) ligament, 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 S63.331A?
Under the General Equivalence Mappings, traumatic rupture of right ulnocarpal (palmar) ligament, initial encounter converts to ICD-9-CM 842.09 (sprain of wrist 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.
