S66.401ABillable
Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
Short description: Unsp inj intrinsic musc/fasc/tend r thm 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
S66Injury of muscle, fascia and tendon at wrist and hand levelS66.0Injury of long flexor musc/fasc/tend thumb at wrs/hnd lvS66.00Unsp inj long flexor musc/fasc/tend thumb at wrs/hnd lvS66.001Unsp inj long flexor musc/fasc/tend r thm at wrs/hnd lvS66.001AUnsp inj long flxr musc/fasc/tend r thm at wrs/hnd lv, initYesS66.001DUnsp inj long flxr musc/fasc/tend r thm at wrs/hnd lv, subsYesS66.001SUnsp inj long flxr musc/fasc/tend r thm at wrs/hnd lv, sqlaYesS66.002Unsp inj long flexor musc/fasc/tend l thm at wrs/hnd lvS66.002AUnsp inj long flxr musc/fasc/tend l thm at wrs/hnd lv, initYesS66.002DUnsp inj long flxr musc/fasc/tend l thm at wrs/hnd lv, subsYesS66.002SUnsp inj long flxr musc/fasc/tend l thm at wrs/hnd lv, sqlaYesS66.009Unsp injury of long flexor musc/fasc/tend thmb at wrs/hnd lv
Frequently asked questions
What is ICD-10 code S66.401A?
S66.401A is an ICD-10-CM diagnosis code for Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter.
Is S66.401A a billable code?
Yes. S66.401A is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is S66.401A in?
S66.401A falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did S66.401A become effective?
S66.401A has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to S66.401A?
S66.401A 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.