2026 ICD-10-CM Diagnosis Code S63.639DSprain of interphalangeal joint of unspecified finger, subsequent encounter

ICD-10-CM Codes›S00–T88›S60-S69›S63

ICD-10-CM S63.639D
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S63.639D is a billable ICD-10-CM diagnosis code for sprain of interphalangeal joint of unspecified 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sprains and strains, subsequent encounter.

Code Identity

ICD-10-CM Code
S63.639D
Billable Status
Yes — Valid for Submission
Code Describes
Sprain of interphalangeal joint of unspecified finger, subsequent encounter
Short Description
Sprain of interphalangeal joint of unsp finger, subs encntr
Parent Code
S63.639
Sprain of interphalangeal joint of unspecified finger

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS60-S69Injuries to the wrist, hand and fingers
CategoryS63Dislocation and sprain of joints and ligaments at wrist and hand level
This CodeS63.639DSprain of interphalangeal joint of unspecified finger, subsequent encounter

Present on Admission (POA)Billing

S63.639D 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.

  • Complete tear of ligament of finger
  • Complete tear, finger, distal interphalangeal joint, radial collateral ligament
  • Complete tear, finger, distal interphalangeal joint, ulnar collateral ligament
  • Complete tear, finger, proximal interphalangeal joint, radial collateral ligament
  • Complete tear, finger, proximal interphalangeal joint, ulnar collateral ligament
  • Interphalangeal sprain
  • Sprain finger, distal interphalangeal joint, radial collateral ligament
  • Sprain finger, distal interphalangeal joint, ulnar collateral ligament
  • Sprain finger, proximal interphalangeal joint, radial collateral ligament
  • Sprain finger, proximal interphalangeal joint, ulnar collateral ligament
  • Sprain of interphalangeal joint of finger
  • Sprain of interphalangeal joint of finger of left hand
  • Sprain of interphalangeal joint of finger of right hand
  • Sprain of ligament of distal interphalangeal joint of finger
  • Sprain of ligament of proximal interphalangeal joint of 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.

CCSR INJ061
Sprains and strains, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

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 S63.639D to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V58.89 Other specfied aftercare
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S63.639DOverview

Is S63.639D (Sprain of interphalangeal joint of unspecified finger) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report sprain of interphalangeal joint of unspecified finger, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character D in S63.639D mean?

The final character D marks a subsequent encounter: use it for routine care while the sprain of interphalangeal joint of unspecified finger is healing, after active treatment has ended.

What MS-DRG does S63.639D group to?

When sprain of interphalangeal joint of unspecified 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 S63.639D 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 unspecified finger, subsequent encounter on inpatient claims.

What is the ICD-9 equivalent of S63.639D?

Under the General Equivalence Mappings, sprain of interphalangeal joint of unspecified 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.