ICD-9-CM diagnosis code (retired)
642.01 — Benign essential hypertension complicating pregnancy, childbirth, and the puerperium, delivered, with or without mention of antepartum condition
About ICD-9-CM 642.01
642.01 is an ICD-9-CM diagnosis code for benign essential hypertension complicating pregnancy, childbirth, and the puerperium, delivered, with or without mention of antepartum condition. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to 8 ICD-10-CM codes, such as O10.011 (Pre-existing essential hypertension complicating pregnancy, first trimester), O10.012 (Pre-existing essential hypertension complicating pregnancy, second trimester) and O10.013 (Pre-existing essential hypertension complicating pregnancy, third trimester). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- O10.011Pre-existing essential hypertension complicating pregnancy, first trimesterapproximate
- O10.012Pre-existing essential hypertension complicating pregnancy, second trimesterapproximate
- O10.013Pre-existing essential hypertension complicating pregnancy, third trimesterapproximate
- O10.02Pre-existing essential hypertension complicating childbirthapproximate
- O10.911Unspecified pre-existing hypertension complicating pregnancy, first trimesterapproximate
- O10.912Unspecified pre-existing hypertension complicating pregnancy, second trimesterapproximate
- O10.913Unspecified pre-existing hypertension complicating pregnancy, third trimesterapproximate
- O10.92Unspecified pre-existing hypertension complicating childbirthapproximate
Common questions about 642.01
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.