2027 ICD-10-CM Diagnosis Code S31.501AUnspecified open wound of unspecified external genital organs, male, initial encounter

ICD-10-CM Codes›S00–T88›S30-S39›S31

ICD-10-CM S31.501A
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S31.501A is a billable ICD-10-CM diagnosis code for unspecified open wound of unspecified external genital organs, male, 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 729 through 730, 963 through 965. Coders also document this condition as glass in genitalia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds of trunk, initial encounter.

Code Identity

ICD-10-CM Code
S31.501A
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of unspecified external genital organs, male, initial encounter
Short Description
Unsp open wound of unsp external genital organs, male, init
Parent Code
S31.501
Unspecified open wound of unspecified external genital organs, male

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS30-S39Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
CategoryS31Open wound of abdomen, lower back, pelvis and external genitals
This CodeS31.501AUnspecified open wound of unspecified external genital organs, male, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Glass in genitalia
  • Glass in trunk
  • Infection - perineal wound
  • Open wound of external genital organs
  • Open wound of genital organ
  • Open wound of male external genitalia
  • Open wound of perineum
  • Penetrating wound of perineum
  • Perineal wound dehiscence

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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to S31.501A: its own notes plus those printed at S31.5, S31, block S30-S39, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals applies to 2,679 codes
  • injuries to the abdominal wall
  • injuries to the anus
  • injuries to the buttock
  • injuries to the external genitalia
  • injuries to the flank
  • injuries to the groin

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From S31.5 Open wound of unspecified external genital organs applies to 36 codes
  • traumatic amputation of external genital organs (S38.21, S38.22)
From S31 Open wound of abdomen, lower back, pelvis and external genitals applies to 558 codes
  • traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From S31 Open wound of abdomen, lower back, pelvis and external genitals applies to 558 codes
From Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals applies to 2,679 codes
  • burns and corrosions (T20-T32)
  • effects of foreign body in anus and rectum (T18.5)
  • effects of foreign body in genitourinary tract (T19.-)
  • effects of foreign body in stomach, small intestine and colon (T18.2-T18.4)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From S31 Open wound of abdomen, lower back, pelvis and external genitals applies to 558 codes

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From S31 Open wound of abdomen, lower back, pelvis and external genitals applies to 558 codes
  • The appropriate 7th character is to be added to each code from category S31
Values for category S31 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S31.501A, its category, or a range that includes it.

Use Additional Code 1

These codes say to use an additional code from the note, and S31.501A is one of the codes named.

  • S38.1 Crushing injury of abdomen, lower back, and pelvis
    open wound of abdominal wall (S31.-) names S31.-, which includes this code

Code Also 6

These codes say S31.501A may also be needed to fully describe the condition. The note gives no sequencing direction.

  • S33.1 Subluxation and dislocation of lumbar vertebra
    open wound of abdomen, lower back and pelvis (S31) names S31, which includes this code
  • S34 Injury of lumbar and sacral spinal cord and nerves at abdomen, lower back and pelvis level
    open wound of abdomen, lower back and pelvis (S31.-) names S31.-, which includes this code
  • S35 Injury of blood vessels at abdomen, lower back and pelvis level
    any associated open wound (S31.-) names S31.-, which includes this code
  • S36 Injury of intra-abdominal organs
    any associated open wound (S31.-) names S31.-, which includes this code
  • S37 Injury of urinary and pelvic organs
    any associated open wound (S31.-) names S31.-, which includes this code
  • S39 Other and unspecified injuries of abdomen, lower back, pelvis and external genitals
    any associated open wound (S31.-) names S31.-, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ013
Open wounds of trunk, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

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 S31.501A to ICD-9-CMHistory

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

ICD-9-CM
878.8 Open wound genital 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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S31.501AOverview

Is S31.501A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of unspecified external genital organs, male, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in S31.501A mean?

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

What MS-DRG does S31.501A group to?

When unspecified open wound of unspecified external genital organs, male, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 729, 964, 965, 963, 730, with relative weights from 0.6595 to 2.6361 depending on complications. Higher weights mean higher Medicare reimbursement.

Can S31.501A be reported with S38.21?

Not as a rule. The Excludes1 note at S31.5, which applies to S31.501A, lists "traumatic amputation of external genital organs (S38.21, S38.22)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of S31.501A?

Under the General Equivalence Mappings, unspecified open wound of unspecified external genital organs, male, initial encounter converts to ICD-9-CM 878.8 (open wound genital NEC). The mapping is approximate, so confirm the match fits the documentation.