S66.201

Hierarchy

Where S66.201 sits in the official hierarchy. Each level is the code it is classified under.

1. S66 Injury of muscle, fascia and tendon at wrist and hand level
2. S66.2 Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level
3. S66.20 Parent Unspecified injury of extensor muscle, fascia and tendon of thumb at wrist and hand level
4. S66.201 This code Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level

Official Coding Notes

Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.

• S66.201A Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter Billable
• S66.201D Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter Billable
• S66.201S Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, sequela Billable

Version History

How S66.201 appears in each release imported from the official files, newest first.

1. FY 2027 Effective October 1, 2026

   Current

   Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level

2. FY 2026 Effective October 1, 2025

   Unchanged

   Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level