S23.421ABillable
Sprain of chondrosternal joint, initial encounter
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- S23
- Effective date
- October 1, 2026
Related codes in category S23
S23Dislocation and sprain of joints and ligaments of thoraxS23.0Traumatic rupture of thoracic intervertebral discS23.0XXATraumatic rupture of thoracic intervertebral disc, initYesS23.0XXDTraumatic rupture of thoracic intervertebral disc, subsYesS23.0XXSTraumatic rupture of thoracic intervertebral disc, sequelaYesS23.1Subluxation and dislocation of thoracic vertebraS23.10Subluxation and dislocation of unspecified thoracic vertebraS23.100Subluxation of unspecified thoracic vertebraS23.100ASubluxation of unspecified thoracic vertebra, init encntrYesS23.100DSubluxation of unspecified thoracic vertebra, subs encntrYesS23.100SSubluxation of unspecified thoracic vertebra, sequelaYesS23.101Dislocation of unspecified thoracic vertebra
Frequently asked questions
What is ICD-10 code S23.421A?
S23.421A is an ICD-10-CM diagnosis code for Sprain of chondrosternal joint, initial encounter.
Is S23.421A a billable code?
Yes. S23.421A is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is S23.421A in?
S23.421A falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did S23.421A become effective?
S23.421A has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to S23.421A?
S23.421A belongs to category S23, 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.