S25.329 ICD-10-CM Code: Major laceration of unspecified innominate or subclavian vein

S25.329 is the ICD-10-CM diagnosis code for major laceration of unspecified innominate or subclavian vein. S25.329 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 thorax (s20-s29).

Header codes like S25.329 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 S25.329'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.