2026 ICD-10-CM Diagnosis Code S63.634DSprain of interphalangeal joint of right ring finger, subsequent encounter
S63.634D is a billable ICD-10-CM diagnosis code for sprain of interphalangeal joint of right ring finger, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. Coders also document this condition as sprain of interphalangeal joint of finger of right hand. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sprains and strains, subsequent encounter.
Code Identity
Code Classification
Present on Admission (POA)Billing
S63.634D 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 interphalangeal joint of finger of right hand
- Sprain of ligament of interphalangeal joint of right ring finger
- Sprain of ligament of right ring finger
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
Finger Injuries and Disorders
You use your fingers and thumbs to do everything from grasping objects to playing musical instruments to typing. When there is something wrong with them, it can make life difficult. Common problems include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S63.634D to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S63.634DOverview
Is S63.634D (Sprain of interphalangeal joint of right ring finger) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report sprain of interphalangeal joint of right ring finger, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character D in S63.634D mean?
The final character D marks a subsequent encounter: use it for routine care while the sprain of interphalangeal joint of right ring finger is healing, after active treatment has ended.
What MS-DRG does S63.634D group to?
When sprain of interphalangeal joint of right ring finger, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S63.634D 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 interphalangeal joint of right ring finger, subsequent encounter on inpatient claims.
What is the ICD-9 equivalent of S63.634D?
Under the General Equivalence Mappings, sprain of interphalangeal joint of right ring finger, subsequent encounter converts to ICD-9-CM V58.89 (other specfied aftercare). 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.
