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|Title||Accuracy of ICD-9-CM coding to identify small for gestational age newborns.|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||Phiri K, Hernandez-Diaz S, Tsen LC, Puopolo KM, Seeger JD, Bateman BT|
|Journal||Pharmacoepidemiol Drug Saf|
|Date Published||2015 Apr|
|Keywords||Adolescent, Adult, Birth Weight, Databases, Factual, Diagnostic Techniques, Obstetrical and Gynecological, Female, History, 21st Century, Humans, Infant, Small for Gestational Age, International Classification of Diseases, Middle Aged|
PURPOSE: This study aimed to evaluate the accuracy of the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) diagnosis code for small for gestational age (SGA) recorded in administrative healthcare records using birthweight and gestational age information recorded in electronic medical records.
METHODS: We used billing and medical records from women aged 13-55 years who delivered at a tertiary care center in the USA between 2004 and 2011. Information on birthweight, gestational age at birth, and ICD-9-CM code for SGA, 656.5x, was abstracted from the database. Each infant's birthweight percentile for gestational age was calculated on the basis of published US references; infants below the 10th percentile were classified as SGA. The performance characteristics of SGA ICD-9-CM diagnosis code against SGA classification based on birthweight and gestational age were calculated, for all deliveries and by strata of demographic and delivery characteristics.
RESULTS: We identified 51 292 singleton live birth deliveries. The prevalence of SGA infants calculated from birthweight and gestational age at birth was higher (13%) than the prevalence based on ICD-9-CM code (2%). Sensitivity of the SGA ICD-9-CM code was 14.2%, specificity was 99.7%, positive predictive value was 86.8%, and negative predictive value was 88.4%. Stratification by demographic and delivery characteristics yielded similar results.
CONCLUSIONS: Identification of SGA infants using ICD-9-CM code, 656.5x, from administrative healthcare records has low sensitivity but high specificity; the accuracy did not differ across demographic and delivery characteristics. Thus, although this source of information would underestimate the prevalence of SGA, it could produce valid relative risk estimates.
|Alternate Journal||Pharmacoepidemiol Drug Saf|
|PubMed Central ID||PMC4533984|
|Grant List||K08 HD075831 / HD / NICHD NIH HHS / United States |
K08HD075831 / HD / NICHD NIH HHS / United States