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S21.91XD ICD-10-CM Code: Laceration without foreign body of unspecified part of thorax, subsequent encounter

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Official Registry Overview & Definition

Laceration without foreign body of unspecified part of thorax, subsequent encounter is a billable ICD-10-CM diagnosis code (S21.91D).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for S21.91XD in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Code Also

Additional codes that may be required to fully describe the encounter.

  • any associated injury, such as:
  • injury of heart (S26.-)
  • injury of intrathoracic organs (S27.-)
  • rib fracture (S22.3-, S22.4-)
  • spinal cord injury (S24.0-, S24.1-)
  • traumatic hemopneumothorax (S27.3)
  • traumatic hemothorax (S27.1)
  • traumatic pneumothorax (S27.0)
  • wound infection

Frequently Compared Codes

The official Excludes notes on S21.91XD name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of S21.91XD in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88) [Hierarchy]
  • S20-S29 — Injuries to the thorax [Hierarchy]

Referenced by Code Also instructions

  • S23.1 — Subluxation and dislocation of thoracic vertebra [Code Also](via S21.-): “open wound of thorax (S21.-)” · check together
  • S24 — Injury of nerves and spinal cord at thorax level [Code Also](via S21.-): “open wound of thorax (S21.-)” · check together
  • S25 — Injury of blood vessels of thorax [Code Also](via S21.-): “any associated open wound (S21.-)” · check together
  • S26 — Injury of heart [Code Also](via S21.-): “open wound of thorax (S21.-)” · check together
  • S27 — Injury of other and unspecified intrathoracic organs [Code Also](via S21.-): “any associated open wound of thorax (S21.-)” · check together
  • S29 — Other and unspecified injuries of thorax [Code Also](via S21.-): “any associated open wound (S21.-)” · check together

Clinical classification (CCSR)

  • INJ050 — Open wounds of trunk, subsequent encounter [CCSR]

Potential MS-DRG

  • DRG 949 — AFTERCARE WITH CC/MCC [MS-DRG]: “AFTERCARE WITH CC/MCC (MDC 23)”
  • DRG 950 — AFTERCARE WITHOUT CC/MCC [MS-DRG]: “AFTERCARE WITHOUT CC/MCC (MDC 23)”

MDC crossing · procedures (1235)

  • MDC 23 — Factors Influencing Health Status and Other Contacts with Health Services [MDC crossing]: “Factors Influencing Health Status and Other Contacts with Health Services — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
  • F003GKZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Audiovisual Equipment [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Audiovisual Equipment — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • F003GMZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Augmentative / Alternative Communication Equipment [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Augmentative / Alternative Communication Equipment — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • F003GPZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Computer [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Computer — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • F003GYZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Other Equipment [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Other Equipment — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • F003GZZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • and 1230 more

Nearest codes (40)

  • S21 — Open wound of thorax [Sibling]
  • S21.449A — Puncture wound with foreign body of unspecified back wall of thorax with penetration into thoracic cavity, initial encounter [Sibling]
  • S21.449D — Puncture wound with foreign body of unspecified back wall of thorax with penetration into thoracic cavity, subsequent encounter [Sibling]
  • S21.449S — Puncture wound with foreign body of unspecified back wall of thorax with penetration into thoracic cavity, sequela [Sibling]
  • S21.45 — Open bite of back wall of thorax with penetration into thoracic cavity [Sibling]
  • S21.451 — Open bite of right back wall of thorax with penetration into thoracic cavity [Sibling]
  • S21.451A — Open bite of right back wall of thorax with penetration into thoracic cavity, initial encounter [Sibling]
  • S21.451D — Open bite of right back wall of thorax with penetration into thoracic cavity, subsequent encounter [Sibling]
  • and 32 more

Referenced by Other Codes

Clinical classification (AHRQ CCSR):INJ050 — Open wounds of trunk, subsequent encounter (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 2 MS-DRGs: DRG 949 (MDC 23), DRG 950 (MDC 23).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Official ICD-10-CM tabular notes on other codes that name S21.91XD or its code family.

6 Code Also instructions: S23.1 (via S21.-), S24 (via S21.-), S25 (via S21.-), S26 (via S21.-), S27 (via S21.-), S29 (via S21.-).

Frequently Asked Questions (FAQ) & Clinical Guidance

Does S21.91XD require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category S21.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S21.91XD in its code family, with their registry titles.

  • S21.90XA — Unspecified open wound of unspecified part of thorax, initial encounter
  • S21.90XD — Unspecified open wound of unspecified part of thorax, subsequent encounter
  • S21.90XS — Unspecified open wound of unspecified part of thorax, sequela
  • S21.91 — Laceration without foreign body of unspecified part of thorax
  • S21.91XA — Laceration without foreign body of unspecified part of thorax, initial encounter
  • S21.91XS — Laceration without foreign body of unspecified part of thorax, sequela
  • S21.92 — Laceration with foreign body of unspecified part of thorax
  • S21.92XA — Laceration with foreign body of unspecified part of thorax, initial encounter
  • S21.92XD — Laceration with foreign body of unspecified part of thorax, subsequent encounter
  • S21.92XS — Laceration with foreign body of unspecified part of thorax, sequela

View all codes in the S21 family