National assessment of validity of coding of acute mastoiditis: a standardised reassessment of 1966 records
Objectives To investigate the internal validity of the diagnosis code used at discharge after treatment of acute mastoiditis. Design Retrospective national re-evaluation study of patient records 19932007 and make comparison with the original ICD codes. Setting All ENT departments at university hospitals and one large county hospital department in Sweden. Participants A total of 1966 records were r
