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ICD-10/S66.30

S66.30 ICD-10-CM Code: Unspecified injury of extensor muscle, fascia and tendon of other and unspecified finger 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

Unspecified injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level is a non-billable ICD-10-CM category code (S66.30). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for S66.30 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.

  • Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2-)
  • 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 S66.30 be billed directly?

No. S66.30 (Unspecified injury of extensor muscle, fascia and tendon of other and unspecified finger 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 S66.30 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 S66.30 in its code family, with their registry titles.

  • S66.299 — Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level
  • S66.299A — Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
  • S66.299D — Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
  • S66.299S — Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
  • S66.3 — Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
  • S66.300 — Unspecified injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level
  • S66.300A — Unspecified injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level, initial encounter
  • S66.300D — Unspecified injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level, subsequent encounter
  • S66.300S — Unspecified injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level, sequela
  • S66.301 — Unspecified injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level

View all codes in the S66 family