S12.121Header code — not billable
Other nondisplaced dens fracture
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- S12
- Effective date
- October 1, 2026
Related codes in category S12
S12Fracture of cervical vertebra and other parts of neckS12.0Fracture of first cervical vertebraS12.00Unspecified fracture of first cervical vertebraS12.000Unspecified displaced fracture of first cervical vertebraS12.000AUnsp disp fx of first cervical vertebra, init for clos fxYesS12.000BUnsp disp fx of first cervical vertebra, init for opn fxYesS12.000DUnsp disp fx of first cervcal vert, subs for fx w routn healYesS12.000GUnsp disp fx of first cervcal vert, subs for fx w delay healYesS12.000KUnsp disp fx of first cervcal vert, subs for fx w nonunionYesS12.000SUnspecified disp fx of first cervical vertebra, sequelaYesS12.001Unspecified nondisplaced fracture of first cervical vertebraS12.001AUnsp nondisp fx of first cervical vertebra, init for clos fxYes
Frequently asked questions
What is ICD-10 code S12.121?
S12.121 is an ICD-10-CM diagnosis code for Other nondisplaced dens fracture.
Is S12.121 a billable code?
No. S12.121 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is S12.121 in?
S12.121 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did S12.121 become effective?
S12.121 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to S12.121?
S12.121 belongs to category S12, 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.