2026 ICD-10-CM Diagnosis Code S31.813APuncture wound without foreign body of right buttock, initial encounter
S31.813A is a billable ICD-10-CM diagnosis code for puncture wound without foreign body of right buttock, 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. Coders also document this condition as gunshot wound of abdomen region. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds of trunk, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Gunshot wound of abdomen region
- Gunshot wound of buttock
- Gunshot wound of right buttock
- Open wound of right buttock
- Puncture wound of buttock
- Puncture wound of right buttock
- Stab wound of right buttock
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Open wound of abdomen, lower back, pelvis and external genitals (S31). 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
Wounds and Injuries
An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S31.813A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S31.813AOverview
Is S31.813A (Puncture wound without foreign body of right buttock) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report puncture wound without foreign body of right buttock, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S31.813A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for puncture wound without foreign body of right buttock, such as an emergency visit or first evaluation.
What MS-DRG does S31.813A group to?
When puncture wound without foreign body of right buttock, 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 S31.813A?
Under the General Equivalence Mappings, puncture wound without foreign body of right buttock, initial encounter converts to ICD-9-CM 877.0 (open wound of buttock). 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.
