2026 ICD-10-CM Diagnosis Code S63.521SSprain of radiocarpal joint of right wrist, sequela
S63.521S is a billable ICD-10-CM diagnosis code for sprain of radiocarpal joint of right wrist, 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 562 through 563. The code is exempt from POA reporting. Coders also document this condition as sprain of ligament of radiocarpal joint of right wrist. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S63.521S 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.
- Sprain of ligament of radiocarpal joint of right wrist
- Sprain of radiocarpal ligament
- Sprain of right wrist
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 S63.521S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S63.521SOverview
Is S63.521S (Sprain of radiocarpal joint of right wrist) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report sprain of radiocarpal joint of right wrist, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S63.521S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the sprain of radiocarpal joint of right wrist itself has resolved, not the original event.
What MS-DRG does S63.521S group to?
When sprain of radiocarpal joint of right wrist, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 562, 563, with relative weights from 0.8955 to 1.4248 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S63.521S 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 sprain of radiocarpal joint of right wrist, sequela on inpatient claims.
What is the ICD-9 equivalent of S63.521S?
Under the General Equivalence Mappings, sprain of radiocarpal joint of right wrist, sequela converts to ICD-9-CM 905.7 (late effec sprain/strain). 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.
