title: The Validity of Administrative BMI Data in Total Joint Arthroplasty.
abstract: Identifying BMI via administrative data is a useful way to evaluate outcomes in total joint arthroplasty (TJA) for varying degrees of obesity. The purpose of this study was to evaluate the concordance between BMI coding in administrative claims data and actual clinical BMI measurements in the medical record for patients undergoing TJA. Clinical BMI value was shown to be a significant determinant of whether ICD-9 codes were used to report the patient's obesity status (P<0.01). Although a higher clinical BMI strongly increased the likelihood of having either of the ICD-9 diagnosis codes used to identify obesity status, only the accuracy of the V85 code increased with increasing levels of BMI.
authors.affiliation: Exponent, Inc.
authors.forename: Edmund C
authors.initials: EC
authors.lastname: Lau
authors.affiliation: Exponent, Inc.
authors.forename: Min-Sun
authors.initials: MS
authors.lastname: Son
authors.affiliation: Department of Orthopedic Surgery, University of Illinois at Chicago, Chicago, Illinois.
authors.forename: David
authors.initials: D
authors.lastname: Mossad
authors.affiliation: Institute at Hahnemann, University Orthopaedic, Philadelphia, Pennsylvania.
authors.forename: Nader
authors.initials: N
authors.lastname: Toossi
authors.affiliation: Institute at Hahnemann, University Orthopaedic, Philadelphia, Pennsylvania.
authors.forename: Norman A
authors.initials: NA
authors.lastname: Johanson
authors.affiliation: Department of Orthopedic Surgery, University of Illinois at Chicago, Chicago, Illinois.
authors.forename: Mark H
authors.initials: MH
authors.lastname: Gonzalez
authors.affiliation: Department of Orthopedic Surgery, Mercy Health System, Philadelphia, Pennsylvania.
authors.forename: Menachem M
authors.initials: MM
authors.lastname: Meller
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019643:Arthroplasty, Replacement; D015992:Body Mass Index; D005260:Female; D006801:Humans; D038801:International Classification of Diseases; D008297:Male; D008499:Medical Records / Q000706:statistics & numerical data*; D008875:Middle Aged; D009765:Obesity; D010865:Pilot Projects; D012189:Retrospective Studies; D055815:Young Adult
keywords: BMI; administrative claims data; complications; obesity; total joint arthroplasty