Skip to main content

S89.90XA ICD-10-CM Code: Unspecified injury of unspecified lower leg, 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 913 — TRAUMATIC INJURY WITH MCC (MDC 21)
  • MS-DRG 914 — TRAUMATIC INJURY WITHOUT MCC (MDC 21)
  • 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 injury of unspecified lower leg, initial encounter is a billable ICD-10-CM diagnosis code (S89.90A).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for S89.90XA in the official ICD-10-CM tabular list.

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 S89.90XA 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.

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 913 (MDC 21), DRG 914 (MDC 21), 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):INJ027 — Other unspecified injury (default).

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

Contextual Map

Every relationship of S89.90XA 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]
  • S80-S89 — Injuries to the knee and lower leg [Hierarchy]

Clinical classification (CCSR)

  • INJ027 — Other unspecified injury [CCSR]

Potential MS-DRG

  • DRG 913 — TRAUMATIC INJURY WITH MCC [MS-DRG]: “TRAUMATIC INJURY WITH MCC (MDC 21)”
  • DRG 914 — TRAUMATIC INJURY WITHOUT MCC [MS-DRG]: “TRAUMATIC INJURY WITHOUT MCC (MDC 21)”
  • 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 (54986)

  • MDC 21 — Injuries, Poisonings and Toxic Effects of Drugs [MDC crossing]: “Injuries, Poisonings and Toxic Effects of Drugs — 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.”
  • 0016070 — Bypass Cerebral Ventricle to Nasopharynx with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Nasopharynx with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016071 — Bypass Cerebral Ventricle to Mastoid Sinus with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Mastoid Sinus with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016072 — Bypass Cerebral Ventricle to Atrium with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Atrium with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016073 — Bypass Cerebral Ventricle to Blood Vessel with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Blood Vessel with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016074 — Bypass Cerebral Ventricle to Pleural Cavity with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Pleural Cavity with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • and 54981 more

Nearest codes (40)

  • S89 — Other and unspecified injuries of lower leg [Sibling]
  • S89.391S — Other physeal fracture of lower end of right fibula, sequela [Sibling]
  • S89.392 — Other physeal fracture of lower end of left fibula [Sibling]
  • S89.392A — Other physeal fracture of lower end of left fibula, initial encounter for closed fracture [Sibling]
  • S89.392D — Other physeal fracture of lower end of left fibula, subsequent encounter for fracture with routine healing [Sibling]
  • S89.392G — Other physeal fracture of lower end of left fibula, subsequent encounter for fracture with delayed healing [Sibling]
  • S89.392K — Other physeal fracture of lower end of left fibula, subsequent encounter for fracture with nonunion [Sibling]
  • S89.392P — Other physeal fracture of lower end of left fibula, subsequent encounter for fracture with malunion [Sibling]
  • and 32 more

Frequently Asked Questions (FAQ) & Clinical Guidance

Does S89.90XA require a 7th character?

Yes. The appropriate 7th character is to be added to each code in subcategory S89.9; The appropriate 7th character is to be added to each code from subcategories S89.0, S89.1, S89.2, and S89.3.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S89.90XA in its code family, with their registry titles.

  • S89.82XA — Other specified injuries of left lower leg, initial encounter
  • S89.82XD — Other specified injuries of left lower leg, subsequent encounter
  • S89.82XS — Other specified injuries of left lower leg, sequela
  • S89.9 — Unspecified injury of lower leg
  • S89.90 — Unspecified injury of unspecified lower leg
  • S89.90XD — Unspecified injury of unspecified lower leg, subsequent encounter
  • S89.90XS — Unspecified injury of unspecified lower leg, sequela
  • S89.91 — Unspecified injury of right lower leg
  • S89.91XA — Unspecified injury of right lower leg, initial encounter
  • S89.91XD — Unspecified injury of right lower leg, subsequent encounter

View all codes in the S89 family