| Source ICD-10 | Mapping Type | Target ICD-9 |
| Recommended Mapping (based on statistical analysis) |
| O10919 (Diagnosis) - Unsp pre-existing htn comp pregnancy, unsp trimester (Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester) | Single To Single | 64200 (Diagnosis) - Essen hyperten preg-unsp (Benign essential hypertension complicating pregnancy, childbirth, and the puerperium, unspecified as to episode of care or not applicable) |
| CMS/CDC General Equivalence Mappings |
| O10919 (Diagnosis) - Unsp pre-existing htn comp pregnancy, unsp trimester (Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester) | Single To Single | Alternative #1: 64200 (Diagnosis) - Essen hyperten preg-unsp (Benign essential hypertension complicating pregnancy, childbirth, and the puerperium, unspecified as to episode of care or not applicable) |