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ICD-10/S66.29

S66.29 ICD-10-CM Code: Other specified injury of extensor muscle, fascia and tendon of thumb at wrist and hand level

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

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

Official Registry Overview & Definition

Other specified injury of extensor muscle, fascia and tendon of thumb at wrist and hand level is a non-billable ICD-10-CM category code (S66.29). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for S66.29 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.

  • sprain of joints and ligaments of wrist and hand (S63.-)
  • 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

Can S66.29 be billed directly?

No. S66.29 (Other specified injury of extensor muscle, fascia and tendon of thumb at wrist and hand level) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does S66.29 require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category S66.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S66.29 in its code family, with their registry titles.

  • S66.222S — Laceration of extensor muscle, fascia and tendon of left thumb at wrist and hand level, sequela
  • S66.229 — Laceration of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level
  • S66.229A — Laceration of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
  • S66.229D — Laceration of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
  • S66.229S — Laceration of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
  • S66.291 — Other specified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level
  • S66.291A — Other specified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
  • S66.291D — Other specified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
  • S66.291S — Other specified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, sequela
  • S66.292 — Other specified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level

View all codes in the S66 family