ICD-10-CM 2027 diagnosis code

S23.420ASprain of sternoclavicular (joint) (ligament), initial encounter

Deleted in FY2027Requires 7th character

S23.420A was removed from ICD-10-CM in FY2027 and can't be reported for dates of service on or after October 1, 2026.Short description: Sprain of sternoclavicular (joint) (ligament), init encntr

Code last changed in FY2016 (effective October 1, 2015). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S23.420A

S23.420A was the ICD-10-CM code for sprain of sternoclavicular (joint) (ligament), initial encounter until it was deleted in FY2027. It can't be reported for dates of service on or after October 1, 2026.

7th character

Ainitial encounter

Other encounter types for S23.420:

Notes that apply from higher levels

Instructions written at a parent level also apply to S23.420A.

› From S23 Dislocation and sprain of joints and ligaments of thorax

Includes

avulsion of joint or ligament of thorax
laceration of cartilage, joint or ligament of thorax
sprain of cartilage, joint or ligament of thorax
traumatic hemarthrosis of joint or ligament of thorax
traumatic rupture of joint or ligament of thorax
traumatic subluxation of joint or ligament of thorax
traumatic tear of joint or ligament of thorax

Excludes2

dislocation, sprain of sternoclavicular joint (S43.2, S43.6)
strain of muscle or tendon of thorax (S29.01-)

Code also

any associated open wound

Broader instructions also apply from S20-S29 Injuries to the thorax and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
FY2027 (effective 10/1/2026): Deleted

Common questions about S23.420A

Is S23.420A billable?: No. S23.420A was deleted in FY2027.
Did S23.420A change for 2027?: Yes. For FY2027 (effective October 1, 2026) it was deleted.