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ICD-10/S64.31XA

S64.31XA ICD-10-CM Code: Injury of digital nerve of right thumb, 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 (FY2026), Appendix B.

  • MS-DRG 073 — CRANIAL AND PERIPHERAL NERVE DISORDERS WITH MCC (MDC 01)
  • MS-DRG 074 — CRANIAL AND PERIPHERAL NERVE DISORDERS WITHOUT MCC (MDC 01)
  • 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.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Injury of digital nerve of right thumb, initial encounter is a billable ICD-10-CM diagnosis code (S64.31A).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for S64.31XA 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.

  • burns and corrosions (T20-T32)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)

Code Also

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

  • any associated open wound (S61.-)

Frequently Asked Questions (FAQ) & Clinical Guidance

Does S64.31XA require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category S64.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S64.31XA in its code family, with their registry titles.

  • S64.30 — Injury of digital nerve of unspecified thumb
  • S64.30XA — Injury of digital nerve of unspecified thumb, initial encounter
  • S64.30XD — Injury of digital nerve of unspecified thumb, subsequent encounter
  • S64.30XS — Injury of digital nerve of unspecified thumb, sequela
  • S64.31 — Injury of digital nerve of right thumb
  • S64.31XD — Injury of digital nerve of right thumb, subsequent encounter
  • S64.31XS — Injury of digital nerve of right thumb, sequela
  • S64.32 — Injury of digital nerve of left thumb
  • S64.32XA — Injury of digital nerve of left thumb, initial encounter
  • S64.32XD — Injury of digital nerve of left thumb, subsequent encounter

View all codes in the S64 family