Table 1.

The 8 cases in which the overseas expert (EA) disagreed with our codes.

Case number	Our original codes	Our ICD-PMa codes	EA’s codes	Comment
1	Unknown	A6; M1	A6; M5	EA: wonder if the placental pathology showing chorioamnionitis (M1) is related to the stillbirth in the absence of other evidence
9	Preeclampsia with placenta abruptio	A3; M2	A3; M4	EA: would classify this as M4 (PETb) as the fetus died before the mother, likely as a result of the PET, rather than the maternal death (M2) being the cause of the fetal death
11	Twin-twin transfusion syndrome (TTTSc), postmortem–hypoplastic adrenals	A1, M1	A1, M5	EA: Do you think the hypoplastic adrenals (A1) was the cause of death? Or hypoxia as a result of the TTTS (M1) with the hypoplastic adrenals being a secondary issue?
19	Unknown	A6; M1	A6; M5	EA: As long as you are certain of the chorioamnionitis (M1) again, or is this a postmortem change (M5) between fetal death and delivery?
23	Unknown	A5; M4	A6; M4	EA: The birthweight is surely to be expected with the delay between fetal death and delivery, and there is no evidence of IUGRd (A5); keep M4 (GDMe).
31	Unknown	A6; M1	A6; M5	EA: Are you confident of the chorioamnionitis (M1) as the cause of death?
71	Fetal syndromal abnormality	A1; M3	A1; M5	EA: The cesarean delivery was done after the fetal death. Cesarean delivery as a cause is more when there are complications (M3) from the cesarean delivery that lead to the fetal death
89	Cord accident, drug addict	A3; M4	A3; M1	EA: Cord accident (A3; M1) as the cause of fetal death rather than mother is drug addict (M4)

^aICD-PM: International Classification of Disease for Perinatal Mortality.

^bPET: pre-eclampsia.

^cTTTS: twin-twin transfusion syndrome.

^dIUGR: intrauterine growth restriction.

^eGDM: gestational diabetes mellitus.