ICD-9-CM diagnosis code (retired)
656.13 — Rhesus isoimmunization, antepartum condition or complication
About ICD-9-CM 656.13
656.13 is an ICD-9-CM diagnosis code for rhesus isoimmunization, antepartum condition or complication. 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 6 ICD-10-CM codes, such as O36.0110 (Maternal care for anti-D [Rh] antibodies, first trimester, not applicable or unspecified), O36.0120 (Maternal care for anti-D [Rh] antibodies, second trimester, not applicable or unspecified) and O36.0130 (Maternal care for anti-D [Rh] antibodies, third trimester, not applicable or unspecified). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- O36.0110Maternal care for anti-D [Rh] antibodies, first trimester, not applicable or unspecifiedapproximate
- O36.0120Maternal care for anti-D [Rh] antibodies, second trimester, not applicable or unspecifiedapproximate
- O36.0130Maternal care for anti-D [Rh] antibodies, third trimester, not applicable or unspecifiedapproximate
- O36.0910Maternal care for other rhesus isoimmunization, first trimester, not applicable or unspecifiedapproximate
- O36.0920Maternal care for other rhesus isoimmunization, second trimester, not applicable or unspecifiedapproximate
- O36.0930Maternal care for other rhesus isoimmunization, third trimester, not applicable or unspecifiedapproximate
Common questions about 656.13
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.