2026 ICD-10-CM Diagnosis Code S31.21XALaceration without foreign body of penis, initial encounter
S31.21XA is a billable ICD-10-CM diagnosis code for laceration without foreign body of penis, 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 729 through 730, 963 through 965. Coders also document this condition as laceration of external male genitalia. 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.
- Laceration of external male genitalia
- Laceration of foreskin
- Laceration of male perineum
- Laceration of penis
- Laceration of skin of penis
- Zipper injury of penis
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
Penis Disorders
Problems with the penis can cause pain and affect a man's sexual function and fertility. Penis disorders include:
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Convert S31.21XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S31.21XAOverview
Is S31.21XA (Laceration without foreign body of penis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report laceration without foreign body of penis, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S31.21XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for laceration without foreign body of penis, such as an emergency visit or first evaluation.
What MS-DRG does S31.21XA group to?
When laceration without foreign body of penis, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 729, 730, 963, 964, 965, with relative weights from 0.6720 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S31.21XA?
Under the General Equivalence Mappings, laceration without foreign body of penis, initial encounter converts to ICD-9-CM 878.0 (open wound of penis). 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.
