ICD code S31.44XA – Vagina and vulva puncture wound with foreign body

Key takeaways

S31.44XA reports a puncture wound with foreign body of the vagina or vulva at the initial encounter, while active treatment is under way.

S31.4 is the vagina and vulva subcategory, so a lower back or pelvis puncture wound with foreign body is coded S31.040A or S31.041A instead.

The A character stays on every claim during active treatment, then D covers routine healing visits and S covers late effects.

An object that entered through the vaginal opening without an open wound is coded T19.2XXA, and a childbirth injury moves to Chapter 15.

Pabau’s claims software holds a claim until required insurer details are in place, then sends it to US payers through Claim.MD.

ICD-10 code S31.44XA: Definition and billable status

ICD-10 code S31.44XA is the billable ICD-10-CM code for a puncture wound with foreign body of the vagina and vulva, initial encounter. It applies when a pointed object pierces the vaginal wall or vulvar skin. A foreign body stays in the wound or was carried into it.

Its full official descriptor is Puncture wound with foreign body of vagina and vulva, initial encounter. The code has been valid since ICD-10-CM took effect on October 1, 2015, with no change in any annual update through FY2027.

Code edits list S31.44XA as applicable to female patients only. A claim fails the sex edit when the patient record does not match, so registration data matters as much as the note.

Quick reference: S31.44XA code details

The table below sets out each element of the code and what it tells a payer.

Code hierarchy: Where S31.44XA sits in ICD-10-CM

The parent-to-child hierarchy confirms that you have reached the most specific valid code. The CMS ICD-10-CM code files publish it every year. For S31.44XA, it runs as follows:

• S00-T88 – Injury, poisoning and certain other consequences of external causes
• S30-S39 – Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
• S31 – Open wound of abdomen, lower back, pelvis and external genitals
• S31.4 – Open wound of vagina and vulva
• S31.44 – Puncture wound with foreign body of vagina and vulva
• S31.44X – Placeholder X, which holds the 7th character in its fixed position
• S31.44XA – Initial encounter

The placeholder X carries no clinical meaning. Omitting it (S31.44A instead of S31.44XA) produces an invalid code that payers reject. For background on how these codes feed into claim processing, see our overview of medical billing fundamentals.

Understanding the 7th character: Initial vs subsequent encounter vs sequela

The 7th character on S31.44XA tracks the phase of care, so the same character can repeat across several visits.

The ICD-10-CM Official Guidelines (Section I.C.19.a) assign A to each encounter where the patient receives active treatment. Take a patient seen in the emergency department on day 1, then by a gynecologist on day 3 for removal under anesthesia. Both claims carry S31.44XA.

Use additional, Excludes1 and Excludes2 notes for S31.44XA

Instructional notes at four levels apply to S31.44XA: the S00-T88 chapter, the S30-S39 block, the S31 category and the S31.4 subcategory.

Use additional and code also notes

• A secondary code from Chapter 20, External causes of morbidity, to show how the injury happened (chapter note)
• Z18.- to identify any retained foreign body, if applicable (chapter note)
• Any associated wound infection (S31 code also note)

Excludes1 notes (cannot be coded with S31.44XA)

• Injury to vagina and vulva during delivery (O70.-, O71.4), at the S31.4 level
• Traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3), at the S31 level

Excludes2 notes (may be coded additionally if clinically present)

• Effects of foreign body in genitourinary tract (T19.-), at the S30-S39 level
• Open wound of hip (S71.00-S71.02), at the S31 level
• Open fracture of pelvis (S32.1-S32.9 with 7th character B), at the S31 level

The obstetric Excludes1 is the one to watch on this code. A vaginal or vulvar wound sustained during childbirth is coded from Chapter 15, never with S31.44XA.

The T19 Excludes2 works the other way. When an object inserted through the vaginal opening also punctures the vaginal wall, both T19.2XXA and S31.44XA may be reported.

Adjacent and easily confused codes near S31.44XA

These codes are the ones most often selected in place of S31.44XA, or the other way round. The AAPC ICD-10-CM code lookup and the ICD10Data entry for S31.44XA both show full descriptors, which helps coders confirm specificity before submission.

Two confusions cause most errors with this code. The first is the foreign body call: with no object documented, code S31.43XA, because S31.44XA without that evidence is upcoding.

The second is site. S31.4 covers only the vagina and vulva, so a puncture wound with foreign body of the lower back or pelvis goes to S31.040A or S31.041A.

The path below runs those checks in order, starting with obstetric context and ending at the wound type the note describes.

Coding S31.44XA when the injury involves sexual assault

Vaginal and vulvar puncture wounds are sometimes the result of assault, which changes how the codes are sequenced. ICD-10-CM guideline I.C.19.f sets the order:

• Confirmed abuse: Sequence T74.21XA (adult sexual abuse, confirmed, initial encounter) first, then S31.44XA.
• Suspected abuse: Sequence T76.21XA (adult sexual abuse, suspected, initial encounter) first, then S31.44XA.
• External cause and perpetrator: Confirmed cases add an assault code from X92-Y09, such as X99.8XXA, plus a Y07.- perpetrator code when the perpetrator is known.
• Suspected cases: Report no external cause code and no perpetrator code.
• Ruled out: If an alleged adult rape is ruled out at the encounter, report Z04.41 instead of a T76 code.

The note decides the path. Code abuse as confirmed only when the provider documents it as confirmed, and as suspected when the note says suspected.

Required companion codes: External cause and place of occurrence

Chapter 19 instructs coders to add a secondary code from Chapter 20 to show how the injury happened. For S31.44XA, that means a W- or X-series mechanism code plus supporting Y codes.

Common external cause codes used with S31.44XA

• W45.8XXA – Other foreign body or object entering through skin, initial encounter
• W45.0XXA – Nail entering through skin, initial encounter
• W26.8XXA – Contact with other sharp object(s), not elsewhere classified, initial encounter
• W26.0XXA – Contact with knife, initial encounter
• X99.8XXA – Assault by other sharp object, initial encounter (confirmed assault only)

Add a place of occurrence code (Y92.-), an activity code (Y93.-) and an external cause status code (Y99.-) when the note supports them. Add Z18.- as well when the provider documents that a fragment of the object was left in place.

Section I.C.20 sets no national requirement to report external cause codes. A state mandate or payer policy can require them, and the guidelines encourage reporting them either way. They also give a reviewer the mechanism behind the wound.

Documentation requirements to support S31.44XA

Clear documentation is the most reliable defense against a denied or audited S31.44XA claim. Under medical billing compliance standards, the provider note must support every element of the code descriptor before submission.

The provider note must explicitly address each of these elements:

• Wound type: The note must establish a puncture mechanism with wording such as puncture wound, penetrating wound or stab wound. Laceration or tear points to S31.41- or S31.42- instead.
• Foreign body: The note names or describes the object, such as a glass fragment, wood splinter or needle. Possible foreign body alone is not enough, so reference any imaging that confirms it.
• Site: The note names the vagina, the vulva or both. A vague site such as pelvic area or genital region cannot support the S31.4 subcategory.
• Context: The note states whether the injury was accidental, obstetric or the result of assault. An obstetric injury moves to Chapter 15, and assault changes the sequencing.
• Encounter phase: The note makes clear whether the visit is active treatment or a routine healing check, so the 7th character is defensible.
• Treatment performed: Removal method, anesthesia type and any repair are not needed to pick the diagnosis code. They support the procedure codes billed with it.

Payer and reimbursement considerations for S31.44XA

S31.44XA does not carry a payment rate of its own. Payment follows the procedure codes billed with it, and the diagnosis establishes medical necessity for them.

Common pairings include CPT 57415 for removal of an impacted vaginal foreign body under anesthesia other than local. CPT 57200 covers nonobstetrical suture of a vaginal injury. When the object is removed without anesthesia, CPT directs coders to an E/M code instead.

On inpatient claims, MS-DRG v44.0 groups S31.44XA into several DRGs, including 760-761 for female reproductive system disorders and 963-965 for multiple significant trauma.

The final DRG depends on the principal diagnosis, the procedures and the secondary codes. The CDC/NCHS ICD-10-CM browser tool confirms the code’s current status.

Prior authorization rules for follow-up wound care vary by payer and plan. Check the plan’s requirements before you schedule extra visits after the initial encounter.

Common claim denial reasons for S31.44XA

Most S31.44XA denials trace back to a short list of errors. Knowing which pattern hits your practice tells you where to intervene. Denial management workflows start by sorting the reason codes on every returned claim. Our list of denial codes for coders explains what each one means.

• Missing 7th character or placeholder: S31.44 or S31.44X alone is an invalid code. Every injury code in the S00-T88 range needs its 7th character.
• Wrong encounter phase: S31.44XD billed on a visit with active treatment, such as foreign body removal, conflicts with the procedure code. Match the 7th character to the care documented in the note.
• No documented foreign body: A removal procedure such as CPT 57415 with a diagnosis that confirms no foreign body flags the claim for review.
• Sex edit conflict: S31.44XA is a female-only diagnosis under code edits. A mismatch with the patient’s registered sex stops the claim before adjudication.
• Obstetric context: A delivery-related vaginal or vulvar injury coded as S31.44XA breaks the Excludes1 note at S31.4. Use the Chapter 15 code instead.
• Missing external cause code: Some payers and state programs require an external cause code on injury claims. Reviewing clean claim submission standards for each payer prevents these returns.

How Pabau keeps S31.44XA claims clean before submission

Many injury claim problems start before the claim leaves the practice. An insurer detail is missing, or a code does not match the visit. Pabau’s billing software for private practices catches the first kind at the point of sending.

Inside its claims software for billers, validation checks run whenever someone sends a claim. If insurer details such as a membership number or authorization code are missing, the Send button stays disabled until the field is fixed.

In the US, claims go out as electronic CMS-1500s through the Claim.MD integration. Your team can run real-time eligibility checks before treatment, track each claim’s status, and post electronic remittance advice back against the claim.

Denials that do come back land in the same claims dashboard. Your billing team starts the fix from the claim itself, not from a payer portal.

Reduce claim denials on injury and wound care codes

Pabau holds a claim until required insurer details are in place, submits it through Claim.MD, and posts ERA remittances back. Book a demo to see the workflow for injury codes like S31.44XA.

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Conclusion

S31.44XA holds up on audit only when the note carries three facts: a puncture mechanism, a named foreign body, and a vaginal or vulvar site. If any one is missing, a different code fits better, whether S31.43XA, S31.42XA or T19.2XXA.

Confirm the site before you assign the code. S31.4 covers the vagina and vulva only, and lower back or pelvis wounds belong under S31.04- instead.

Context matters as much as anatomy. A childbirth injury moves to Chapter 15, and documented sexual abuse puts a T74 or T76 code ahead of S31.44XA.

Accurate codes still need clean claims behind them. Book a demo to see your team run claims, eligibility checks and remittances for injury codes from one dashboard.

Continue your research

Need to understand how claim clearinghouses work? Medical claims clearinghouse overview explains how payer validation works before a claim reaches adjudication.

Coding a vaginal or vulvar laceration at follow-up? ICD-10 code S31.41XD covers the subsequent-encounter code for a laceration without foreign body in the same subcategory.

Does a payer want approval before follow-up wound care? Prior authorization process guide walks through requesting and tracking approvals before extra visits.

Want to reduce denials across your entire ICD-10 code set? Revenue cycle management guide covers the end-to-end process from coding through payment posting.

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