2026 ICD-10-CM Diagnosis Code S43.129ADislocation of unspecified acromioclavicular joint, 100%-200% displacement, initial encounter
S43.129A is a billable ICD-10-CM diagnosis code for dislocation of unspecified acromioclavicular joint, 100%-200% displacement, 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 Dislocations, 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 of shoulder girdle (S43). 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
Dislocated Shoulder
Your shoulder joint is made up of three bones: your collarbone, your shoulder blade, and your upper arm bone. The top of your upper arm bone is shaped like a ball. This ball fits into a cuplike socket in your shoulder blade. A shoulder dislocation is an injury that happens when the ball pops out of your socket.
The full article covers:
- What is a dislocated shoulder?
- What causes a dislocated shoulder?
- Who is at risk for a dislocated shoulder?
- What are the symptoms of a dislocated shoulder?
- How is a dislocated shoulder diagnosed?
- What are the treatments for a dislocated shoulder?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S43.129A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S43.129AOverview
Is S43.129A a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report dislocation of unspecified acromioclavicular joint, 100%-200% displacement, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S43.129A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for dislocation of unspecified acromioclavicular joint, 100%-200% displacement, such as an emergency visit or first evaluation.
What MS-DRG does S43.129A group to?
When dislocation of unspecified acromioclavicular joint, 100%-200% displacement, 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 S43.129A?
Under the General Equivalence Mappings, dislocation of unspecified acromioclavicular joint, 100%-200% displacement, initial encounter converts to ICD-9-CM 831.04 (disloc acromioclavic-cl). 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.
