2026 ICD-10-CM Diagnosis Code S63.599AOther specified sprain of unspecified wrist, initial encounter

ICD-10-CM Codes›S00–T88›S60-S69›S63

ICD-10-CM S63.599A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S63.599A is a billable ICD-10-CM diagnosis code for other specified sprain of unspecified wrist, 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

ICD-10-CM Code
S63.599A
Billable Status
Yes — Valid for Submission
Code Describes
Other specified sprain of unspecified wrist, initial encounter
Short Description
Other specified sprain of unspecified wrist, init encntr
Parent Code
S63.599
Other specified sprain of unspecified wrist

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 CodeS63.599AOther specified sprain of unspecified wrist, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carpal joint sprain
  • Complete tear of ulnolunate ligament
  • Complete tear of wrist ligament
  • Complete tear triangular fibrocartilage
  • Complete tear ulnar carpal complex nonspecific
  • Complete tear ulnar-carpal meniscus
  • Distal radioulnar joint sprain
  • Fracture of head of radius with dislocation of distal radioulnar joint and interosseous membrane disruption
  • Fracture of radial head
  • Injury to triangular fibrocartilage of wrist joint
  • Lesion of ligament of wrist and/or hand
  • Sprain of radiolunate ligament
  • Sprain of radioscaphocapitate ligament
  • Sprain of radioscapholunate ligament
  • Sprain of ulnar carpal complex ligament
  • Sprain of ulnar collateral ligament of wrist joint
  • Sprain of ulnolunate ligament
  • Sprain short intrinsic ligament nonspecific
  • Sprain triangular fibrocartilage
  • Sprain ulnar-carpal meniscus
  • Sprain volar intercarpal ligament or V ligament
  • Traumatic division of wrist ligament
  • Traumatic rupture of triangular fibrocartilage complex of wrist region
  • Triangular fibrocartilage detachment
  • Triangular fibrocartilage tear
  • Triangular ligament tear

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 INJ024
Sprains and strains, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S63.599A to ICD-9-CMHistory

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

ICD-9-CM
842.09 Sprain of wrist NEC
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 S63.599AOverview

Is S63.599A (Other specified sprain of unspecified wrist) a billable code?

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

What does the 7th character A in S63.599A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for other specified sprain of unspecified wrist, such as an emergency visit or first evaluation.

What MS-DRG does S63.599A group to?

When other specified sprain of unspecified wrist, 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 S63.599A?

Under the General Equivalence Mappings, other specified sprain of unspecified wrist, 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.