S31.40XS Unspecified open wound of vagina and vulva, sequela

ICD-10-CM Diagnosis Code S31.40XS: Unspecified open wound of vagina and vulva, sequela

ICD-10-CM code S31.40XS identifies an unspecified open wound of the vagina and vulva, sequela. Terminology records classify this active diagnosis concept under the parent code S31.40 and assign it the semantic type of Injury or Poisoning. This reference synthesizes official terminology data and Medicare billing articles to explain the code's structure and operational context. 1 3 5

Plain-language overview

The diagnosis concept S31.40XS carries the preferred name Unspecified open wound of vagina and vulva, sequela, and holds an active record status within the ICD-10-CM version 2026 terminology. 1

Patients and clinicians navigating vulvar conditions may encounter anatomical distinctions, as individuals often struggle to correctly identify vulvar and vaginal structures on schematic diagrams. 2

What this code represents

Code S31.40XS represents a diagnosis concept classified with the semantic type Injury or Poisoning, specifically denoting a sequela of an unspecified open wound of the vagina and vulva. 1 5

Within the terminology hierarchy, S31.40XS is a narrower concept under the parent code S31.40, which is the unspecified open wound of vagina and vulva. 1

Coding details

The broader category S31.4 encompasses open wounds of the vagina and vulva, including specific variations like open bites, puncture wounds with foreign bodies, and puncture wounds without foreign bodies. 6

The S31.40 code family distinguishes encounter types using seventh-character extensions, with S31.40XA for initial encounters, S31.40XD for subsequent encounters, and S31.40XS for sequelae. 3 4 6

Documentation considerations

A Medicare billing and coding article for wound and ulcer care lists S31.40XS alongside initial and subsequent encounter codes, providing operational context for how this diagnosis appears in payer-related documentation. 3

What the sources add

While terminology records define the hierarchical structure and semantic type of S31.40XS, clinical literature highlights that vulvar anatomy involves distinct structures like the vestibule, hymenal ring, and urethral opening. 1 2

Terminology records from the National Cancer Institute and Medicare billing articles both list S31.40XS, but the terminology record provides the official parent concept while the billing article groups it with initial and subsequent encounter variations. 1 3

Sources

1. ICD-10-CM S31.40XS terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Update vulval dermatology – diagnostics and therapy — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Wound and Ulcer Care (A58567) — cms.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
5. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
6. ICD-10-CM 2024 | S31.4 - Open wound of vagina and vulva — unboundmedicine.com; accessed 2026-07-27.