ICD-10 E87.1 coding algorithms | Performance measures % | Serum sodium measurements (mmol/l)* | |||||
---|---|---|---|---|---|---|---|
Emergency department | Hospital admission | ||||||
<135 | ≤130 | ≤125 | <135 | ≤130 | ≤125 | ||
All diagnosis | Sensitivity | 4.49 | 12.58 | 34.43 | 6.42 | 17.06 | 41.68 |
Specificity | 99.97 | 99.95 | 99.71 | 99.72 | 99.55 | 99.12 | |
PPV | 97.42 | 94.33 | 68.21 | 88.30 | 77.20 | 52.43 | |
NPV | 81.17 | 94.04 | 98.82 | 76.21 | 93.06 | 98.64 | |
Main diagnosis | Sensitivity | 2.48 | 6.94 | 20.64 | |||
Specificity | 99.99 | 99.97 | 99.87 | ||||
PPV | 97.81 | 94.69 | 74.38 | ||||
NPV | 80.86 | 93.68 | 98.58 | ||||
Admission diagnosis | Sensitivity | 4.97 | 14.02 | 36.66 | |||
Specificity | 99.87 | 99.80 | 99.49 | ||||
PPV | 92.70 | 86.10 | 62.57 | ||||
NPV | 75.96 | 92.84 | 98.53 | ||||
Most responsible diagnosis | Sensitivity | 1.56 | 4.70 | 15.48 | |||
Specificity | 99.99 | 99.99 | 99.96 | ||||
PPV | 98.43 | 97.65 | 89.41 | ||||
NPV | 75.33 | 92.14 | 98.06 | ||||
Admission diagnosis+most responsible diagnosis | Sensitivity | 1.54 | 4.64 | 15.41 | |||
Specificity | 99.99 | 99.99 | 99.96 | ||||
PPV | 98.41 | 97.62 | 90.08 | ||||
NPV | 75.33 | 92.14 | 98.06 |
*95% CIs were calculated using the Wilson score method but were not reported. All intervals were within ±4% of the point estimate.
ICD-10, International Classification of Diseases, 10th revision; PPV, positive predictive value; NPV, negative predictive value.