2026 ICD-10-CM Diagnosis Code S41.102AUnspecified open wound of left upper arm, initial encounter

ICD-10-CM Codes›S00–T88›S40-S49›S41

ICD-10-CM S41.102A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S41.102A is a billable ICD-10-CM diagnosis code for unspecified open wound of left upper arm, 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 604 through 605, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds to limbs, initial encounter.

Code Identity

ICD-10-CM Code
S41.102A
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of left upper arm, initial encounter
Short Description
Unspecified open wound of left upper arm, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S41.102
Unspecified open wound of left upper arm

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS40-S49Injuries to the shoulder and upper arm
CategoryS41Open wound of shoulder and upper arm
This CodeS41.102AUnspecified open wound of left upper arm, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Fracture of anatomical neck of humerus
  • Fracture of greater tuberosity of humerus
  • Fracture of lateral condyle of humerus
  • Fracture of shaft of humerus
  • Fracture of shaft of left humerus
  • Fracture of surgical neck of humerus
  • Open fracture of anatomical neck of proximal left humerus
  • Open fracture of condyle of humerus
  • Open fracture of distal left humerus
  • Open fracture of greater tubercule of left humerus
  • Open fracture of humerus, upper epiphysis
  • Open fracture of lateral condyle of humerus
  • Open fracture of lateral condyle of left humerus
  • Open fracture of left elbow
  • Open fracture of left humerus
  • Open fracture of proximal humerus, anatomical neck
  • Open fracture of proximal left humerus
  • Open fracture of shaft of humerus
  • Open fracture of shaft of left humerus
  • Open fracture of surgical neck of humerus
  • Open fracture of surgical neck of left humerus
  • Open fracture proximal humerus, greater tuberosity
  • Open fracture proximal humerus, neck
  • Open supracondylar fracture of left humerus
  • Open wound of left axillary region
  • Open wound of left upper arm
  • Supracondylar fracture of humerus
  • Supracondylar fracture of left humerus

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of shoulder and upper arm (S41). 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 INJ012
Open wounds to limbs, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Arm Injuries and Disorders

Of the 206 bones in your body, three of them are in your arm: the humerus, radius, and ulna. Your arms are also made up of muscles, joints, tendons, and other connective tissue. Injuries to any of these parts of the arm can occur during sports, a fall, or an accident.

Read the full article at MedlinePlus

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

Convert S41.102A to ICD-9-CMHistory

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

ICD-9-CM
880.03 Open wound of upper arm
Approximate The match is approximate rather than exact.
ICD-9-CM
880.09 Mult open wound shoulder
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 S41.102AOverview

Is S41.102A (Unspecified open wound of left upper arm) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of left upper arm, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S41.102A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified open wound of left upper arm, such as an emergency visit or first evaluation.

What MS-DRG does S41.102A group to?

When unspecified open wound of left upper arm, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S41.102A?

Under the General Equivalence Mappings, unspecified open wound of left upper arm, initial encounter converts to ICD-9-CM 880.03 (open wound of upper arm) and 880.09 (mult open wound shoulder). 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.