O9A.21Injury, poisoning and certain other consequences of external causes complicating pregnancy

O9A.21 is the ICD-10-CM diagnosis code for injury, poisoning and certain other consequences of external causes complicating pregnancy. It belongs to category O9A (maternal malignant neoplasms, traumatic injuries and abuse classifiable elsewhere but complicating pregnancy, childbirth and the puerperium), block O94-O9A (other obstetric conditions, not elsewhere classified) 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 O9A.2 (injury, poisoning and certain other consequences of external causes complicating pregnancy, childbirth and the puerperium), O9A.21 is specifically for injury, poisoning and certain other consequences of external causes complicating pregnancy. Related codes cover childbirth (O9A.22) and the puerperium (O9A.23).

To report this condition, pick the subcode that matches the documentation: O9A.211 (first trimester), O9A.212 (second trimester), O9A.213 (third trimester) and O9A.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.