S43.121 ICD-10-CM Code: Dislocation of right acromioclavicular joint, 100%-200% displacement

S43.121 is the ICD-10-CM diagnosis code for dislocation of right acromioclavicular joint, 100%-200% displacement. S43.121 sits in the ICD-10-CM chapter for injury, poisoning and certain other consequences of external causes (s00-t88), within the section covering injuries to the shoulder and upper arm (s40-s49).

Header codes like S43.121 cannot be reported on claims directly, they organize child codes that share clinical context but the actual diagnosis must be coded to the highest level of specificity supported by the documentation. Coders should look at S43.121's child codes and select the one that matches the patient's documented presentation, since payers reject header codes submitted as the primary diagnosis. For risk adjustment workflows, header codes never contribute to a Medicare Advantage member's RAF score on their own; only billable child codes that happen to map to a payment HCC affect risk-adjusted plan payments.