Unspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
Short description: Unsp inj intrinsic musc/fasc/tend thmb at wrs/hnd lv, init
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- S66
- Effective date
- October 1, 2026
Related codes in category S66
Frequently asked questions
What is ICD-10 code S66.409A?
S66.409A is an ICD-10-CM diagnosis code for Unspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter.
Is S66.409A a billable code?
Yes. S66.409A is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is S66.409A in?
S66.409A falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did S66.409A become effective?
S66.409A has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to S66.409A?
S66.409A belongs to category S66, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.