S13.121ABillable
Dislocation of C1/C2 cervical vertebrae, initial encounter
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- S13
- Effective date
- October 1, 2026
Related codes in category S13
S13Dislocation and sprain of joints and ligaments at neck levelS13.0Traumatic rupture of cervical intervertebral discS13.0XXATraumatic rupture of cervical intervertebral disc, initYesS13.0XXDTraumatic rupture of cervical intervertebral disc, subsYesS13.0XXSTraumatic rupture of cervical intervertebral disc, sequelaYesS13.1Subluxation and dislocation of cervical vertebraeS13.10Subluxation and dislocation of unsp cervical vertebraeS13.100Subluxation of unspecified cervical vertebraeS13.100ASubluxation of unspecified cervical vertebrae, init encntrYesS13.100DSubluxation of unspecified cervical vertebrae, subs encntrYesS13.100SSubluxation of unspecified cervical vertebrae, sequelaYesS13.101Dislocation of unspecified cervical vertebrae
Frequently asked questions
What is ICD-10 code S13.121A?
S13.121A is an ICD-10-CM diagnosis code for Dislocation of C1/C2 cervical vertebrae, initial encounter.
Is S13.121A a billable code?
Yes. S13.121A is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is S13.121A in?
S13.121A falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did S13.121A become effective?
S13.121A has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to S13.121A?
S13.121A belongs to category S13, 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.