characteristics, except for deliveries with postpartum anemia. The sensitivity of the codes for PPH with postpartum anemia was higher than those for PPH without this diagnosis [94.2% (95% CI: 93.9-94.5) vs. 82.6% (95% CI: 82.1-83.1)]; the specificity for PPH with postpartum anemia was lower than those without this diagnosis [93.0% (95% CI: 92.7-93.3) vs. 99.7% (95% CI: 99.7-99.7)]. The sensitivity of ICD-10 codes for PPH with ≥ 1 unit of transfusion was 91.3% (95% CI: 90.7-91.9), compared with the sensitivity for PPH without transfusion [88.0% (95% CI: 87.6-88.4)]. The specificity of ICD codes for PPH with ≥ 1 unit of transfusion was 83.5% (95% CI: 82.3-84.6) versus the specificity for PPH without transfusion of 99.6% (95% CI: 99.6-99.6). The sensitivity and specificity for PPH with ≥ 4 units of blood transfusion was 90.3% (95% CI: 88.9-91.6) and 73.6% (95% CI: 69.8-77.1), respectively.These findings suggest that the ICD-10 codes for PPH have high sensitivity and specificity. Ensuring the accuracy of the diagnostic codes for PPH are useful for research purposes, quality improvement efforts, and reporting PPH trends.