O09.21Supervision of pregnancy with history of pre-term labor

O09.21 is the ICD-10-CM diagnosis code for supervision of pregnancy with history of pre-term labor. It belongs to category O09 (supervision of high risk pregnancy), block O09 (supervision of high risk pregnancy) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within O09.2 (supervision of pregnancy with other poor reproductive or obstetric history), O09.21 is specifically for supervision of pregnancy with history of pre-term labor. Related codes cover other poor reproductive or obstetric history (O09.29).

To report this condition, pick the subcode that matches the documentation: O09.211 (first trimester), O09.212 (second trimester), O09.213 (third trimester) and O09.219 (unspecified trimester).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.