Article Text
Abstract
Objective Diagnosis codes might be used for diabetes surveillance if they accurately distinguish diabetes type. We assessed the validity of International Classification of Disease, 10th Revision, Clinical Modification (ICD-10-CM) codes to discriminate between type 1 diabetes mellitus (T1DM) and type 2 diabetes mellitus (T2DM) among health plan members with youth-onset (diagnosis age <20 years) diabetes.
Research design and methods . Diabetes case identification and abstraction of diabetes type was done as part of the SEARCH for Diabetes in Youth Study. The gold standard for diabetes type is the physician-assigned diabetes type documented in patients’ medical records. Using all healthcare encounters with ICD-10-CM codes for diabetes, we summarized codes within each encounter and determined diabetes type using percent of encounters classified as T2DM. We chose 50% as the threshold from a receiver operating characteristic curve because this threshold yielded the largest Youden’s index. Persons with ≥50% T2DM-coded encounters were classified as having T2DM. Otherwise, persons were classified as having T1DM. We calculated sensitivity, specificity, positive and negative predictive values, and accuracy overall and by demographic characteristics.
Results According to the gold standard, 1911 persons had T1DM and 652 persons had T2DM (mean age (SD): 19.1 (6.5) years). We obtained 90.6% (95% CI 88.4% to 92.9%) sensitivity, 96.3% (95% CI 95.4% to 97.1%) specificity, 89.3% (95% CI 86.9% to 91.6%) positive predictive value, 96.8% (95% CI 96.0% to 97.6%) negative predictive value, and 94.8% (95% CI 94.0% to 95.7%) accuracy for discriminating T2DM from T1DM.
Conclusions ICD-10-CM codes can accurately classify diabetes type for persons with youth-onset diabetes, showing promise for rapid, cost-efficient diabetes surveillance.
- type 1 diabetes mellitus
- type 2 diabetes mellitus
- electronic health records
- international classification of diseases
- surveillance
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Footnotes
Contributors GCC researched data, contributed to study design, and wrote the manuscript. XL conducted statistical analysis, contributed to statistical design, and researched data. SYT contributed to study design and reviewed and edited the manuscript. JMS contributed to statistical design and reviewed and edited the manuscript. CK reviewed and edited the manuscript. JML oversaw the study, researched data, contributed to study design, reviewed, and edited the manuscript.
Funding The SEARCH for Diabetes in Youth Study has been funded by the Centers for Disease Control and Prevention (awards U48/CCU919219, U01DP000246, U18DP002714, and U18DP006133) with support from the National Institutes of Diabetes and Digestive and Kidney Diseases.
Competing interests JML reports grants from the Centers for Disease Control and Prevention during the conduct of the study.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement No additional data are available.