Table 2.

Sensitivity, specificity, PPV, and NPV of ICD-9 198.5 coding for bone metastases in the structured EHR and claims vs chart review with technology-enabled abstraction of the unstructured EHR as a reference

	Structured EHR ICD-9 198.5	Claims ICD-9 198.5
N	493	563
Sensitivity	0.668 (95% CI: 0.628–0.708)	0.775 (95% CI: 0.739–0.811)
Specificity	0.983 (95% CI: 0.980–0.986)	0.981 (95% CI: 0.978–0.984)
PPV	0.710 (95% CI: 0.670–0.750)	0.721 (95% CI: 0.684–0.758)
NPV	0.979 (95% CI: 0.976–0.982)	0.986 (95% CI: 0.983–0.988)

Abbreviations: PPV, positive predictive value; NPV, negative predictive value; ICD-9, International Classification of Diseases, ninth revision; EHR, electronic health records.