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S20.304A ICD-10-CM Code: Unspecified superficial injuries of middle front wall of thorax, initial 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.

  • MS-DRG 604 — TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITH MCC (MDC 09)
  • MS-DRG 605 — TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITHOUT MCC (MDC 09)
  • MS-DRG 963 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH MCC (MDC 24)
  • MS-DRG 964 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH CC (MDC 24)
  • MS-DRG 965 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITHOUT CC/MCC (MDC 24)

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

Unspecified superficial injuries of middle front wall of thorax, initial encounter is a billable ICD-10-CM diagnosis code (S20.304A).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for S20.304A 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

Excludes2 — Not Included Here

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

Frequently Compared Codes

The official Excludes notes on S20.304A name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

  • FY2021 — 2020-10-01
    Added to the code set
    Unspecified superficial injuries of middle front wall of thorax, initial encounter
    FY2021 changes

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.

Relationships & Classification

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 5 MS-DRGs: DRG 604 (MDC 09), DRG 605 (MDC 09), DRG 963 (MDC 24), DRG 964 (MDC 24), DRG 965 (MDC 24).

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

Clinical classification (AHRQ CCSR):INJ017 — Superficial injury; contusion, initial encounter (default).

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

Related Codes

Same injury — initial / subsequent / sequela

Same injury, coded at a different phase of treatment via the 7th character.

S20.304D — Unspecified superficial injuries of middle front wall of thorax, subsequent encounter (subsequent encounter), S20.304S — Unspecified superficial injuries of middle front wall of thorax, sequela (sequela)

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Superficial injury; contusion, initial encounter).

+763 more

Lab tests where this diagnosis supports Medicare coverage

Medicare's National Coverage Determinations list this diagnosis as medical justification for these lab tests.

Partial Thromboplastin Time (PTT) Test (lab test), Prothrombin Time Test and INR (PT/INR) (lab test)

Contextual Map

Every relationship of S20.304A 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]

Clinical classification (CCSR)

  • INJ017 — Superficial injury; contusion, initial encounter [CCSR]

Potential MS-DRG

  • DRG 604 — TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITH MCC [MS-DRG]: “TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITH MCC (MDC 09)”
  • DRG 605 — TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITHOUT MCC [MS-DRG]: “TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITHOUT MCC (MDC 09)”
  • DRG 963 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH MCC [MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITH MCC (MDC 24)”
  • DRG 964 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH CC [MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITH CC (MDC 24)”
  • DRG 965 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITHOUT CC/MCC [MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITHOUT CC/MCC (MDC 24)”

MDC crossing · procedures (30333)

  • MDC 09 — Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast [MDC crossing]: “Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast — 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.”
  • MDC 24 — Multiple Significant Trauma [MDC crossing]: “Multiple Significant Trauma — 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.”
  • 0315090 — Bypass Right Axillary Artery to Right Upper Arm Artery with Autologous Venous Tissue, Open Approach [Same-MDC procedure]: “Bypass Right Axillary Artery to Right Upper Arm Artery with Autologous Venous Tissue, Open Approach — grouped in MDC 09, the procedure side of this code's crossing.” · check together
  • 031509W — Bypass Right Axillary Artery to Lower Extremity Vein with Autologous Venous Tissue, Open Approach [Same-MDC procedure]: “Bypass Right Axillary Artery to Lower Extremity Vein with Autologous Venous Tissue, Open Approach — grouped in MDC 09, the procedure side of this code's crossing.” · check together
  • 03150A0 — Bypass Right Axillary Artery to Right Upper Arm Artery with Autologous Arterial Tissue, Open Approach [Same-MDC procedure]: “Bypass Right Axillary Artery to Right Upper Arm Artery with Autologous Arterial Tissue, Open Approach — grouped in MDC 09, the procedure side of this code's crossing.” · check together
  • 03150AW — Bypass Right Axillary Artery to Lower Extremity Vein with Autologous Arterial Tissue, Open Approach [Same-MDC procedure]: “Bypass Right Axillary Artery to Lower Extremity Vein with Autologous Arterial Tissue, Open Approach — grouped in MDC 09, the procedure side of this code's crossing.” · check together
  • 03150J0 — Bypass Right Axillary Artery to Right Upper Arm Artery with Synthetic Substitute, Open Approach [Same-MDC procedure]: “Bypass Right Axillary Artery to Right Upper Arm Artery with Synthetic Substitute, Open Approach — grouped in MDC 09, the procedure side of this code's crossing.” · check together
  • and 30328 more

Nearest codes (40)

  • S20 — Superficial injury of thorax [Sibling]
  • S20.224S — Contusion of middle back wall of thorax, sequela [Sibling]
  • S20.229 — Contusion of unspecified back wall of thorax [Sibling]
  • S20.229A — Contusion of unspecified back wall of thorax, initial encounter [Sibling]
  • S20.229D — Contusion of unspecified back wall of thorax, subsequent encounter [Sibling]
  • S20.229S — Contusion of unspecified back wall of thorax, sequela [Sibling]
  • S20.3 — Other and unspecified superficial injuries of front wall of thorax [Sibling]
  • S20.30 — Unspecified superficial injuries of front wall of thorax [Sibling]
  • and 32 more

Change history

  • FY2021 — Added to the code set [Change history]

Frequently Asked Questions (FAQ) & Clinical Guidance

Does S20.304A require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category S20.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S20.304A in its code family, with their registry titles.

  • S20.303 — Unspecified superficial injuries of bilateral front wall of thorax
  • S20.303A — Unspecified superficial injuries of bilateral front wall of thorax, initial encounter
  • S20.303D — Unspecified superficial injuries of bilateral front wall of thorax, subsequent encounter
  • S20.303S — Unspecified superficial injuries of bilateral front wall of thorax, sequela
  • S20.304 — Unspecified superficial injuries of middle front wall of thorax
  • S20.304D — Unspecified superficial injuries of middle front wall of thorax, subsequent encounter
  • S20.304S — Unspecified superficial injuries of middle front wall of thorax, sequela
  • S20.309 — Unspecified superficial injuries of unspecified front wall of thorax
  • S20.309A — Unspecified superficial injuries of unspecified front wall of thorax, initial encounter
  • S20.309D — Unspecified superficial injuries of unspecified front wall of thorax, subsequent encounter

View all codes in the S20 family