O35.12 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18

Non-billable ICD-10-CM code.

Applies from O35 Maternal care for known or suspected fetal abnormality and damage

Includes

• the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy

Excludes1 (never code together)

• encounter for suspected maternal and fetal conditions ruled out (Z03.7-)

Code also

• any associated maternal condition

7th character note

• One of the following 7th characters is to be assigned to each code under category O35. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O35 that has a 7th character of 1 through 9.

7th character required

• 0 — not applicable or unspecified
• 1 — fetus 1
• 2 — fetus 2
• 3 — fetus 3
• 4 — fetus 4
• 5 — fetus 5
• 9 — other fetus

Code annotations containing back-references to O35.12

Back-references to O35.1

• Type 2 Excludes: O35.0 Maternal care for (suspected) central nervous system malformation in fetus ("chromosomal abnormality in fetus (O35.1-)")
• Type 2 Excludes: O35.2 Maternal care for (suspected) hereditary disease in fetus ("chromosomal abnormality in fetus (O35.1-)")

Back-references to O35

• Type 2 Excludes: O98 Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium ("when the reason for maternal care is that the disease is known or suspected to have affected the fetus (O35-O36)")
• Type 2 Excludes: O99 Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium ("when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)")
• Type 1 Excludes: Z03.7 Encounter for suspected maternal and fetal conditions ruled out ("known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-)")

Diagnosis Index entries for O35.12

• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › fetal (maternal care for) › chromosomal abnormality (conditions in Q90-Q99) › Trisomy 18

Nearby codes

• O35.11X2 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 2
• O35.11X3 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 3
• O35.11X4 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 4
• O35.11X5 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 5
• O35.11X9 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, other fetus
• O35.12 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18 (this code)
• O35.12X0 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, not applicable or unspecified
• O35.12X1 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 1
• O35.12X2 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 2
• O35.12X3 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 3
• O35.12X4 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 4