DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

O35 Maternal care for known or suspected fetal abnormality and damage

  • Header · not billable
  • Codes take a 7th character

O35 is not billable. The category heads 231 billable codes in FY2027, grouped under 18 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Index → code

  • Rubella (German measles)maternalcare for (suspected) damage to fetus → O35.3
  • Rubella (German measles)maternalsuspected damage to fetus affecting management of pregnancy → O35.3
  • Infection, infected, infective (opportunistic)cytomegalovirus, cytomegaloviralmaternal, maternal care for (suspected) damage to fetus → O35.3

Where it sits

  1. Chapter 15 Pregnancy, childbirth and the puerperium (O00-O9A)
  2. O30-O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
  3. O35 Maternal care for known or suspected fetal abnormality and damage
Billable codes
231
Subdivisions
18
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
55

Codes in O35

  1. O35.0
    Maternal care for (suspected) central nervous system malformation in fetus
    Header
    Excludes2 1

    Excludes2

    • chromosomal abnormality in fetus (O35.1-) O35.1
  2. O35.00
    Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified +7th: 0 1 2 3 4 5 9
    Needs 7th character
  3. O35.01
    Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum +7th: 0 1 2 3 4 5 9
    Needs 7th character
  4. O35.02
    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly +7th: 0 1 2 3 4 5 9
    Needs 7th character
  5. O35.03
    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts +7th: 0 1 2 3 4 5 9
    Needs 7th character
  6. O35.04
    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele +7th: 0 1 2 3 4 5 9
    Needs 7th character
  7. O35.05
    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly +7th: 0 1 2 3 4 5 9
    Needs 7th character
  8. O35.06
    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 1

    Inclusion terms

    • Maternal care for fetal hydrocephalus
  9. O35.07
    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly +7th: 0 1 2 3 4 5 9
    Needs 7th character
  10. O35.08
    Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida +7th: 0 1 2 3 4 5 9
    Needs 7th character
  11. O35.09
    Maternal care for (suspected) other central nervous system malformation or damage in fetus +7th: 0 1 2 3 4 5 9
    Needs 7th character
  12. O35.1
    Maternal care for (suspected) chromosomal abnormality in fetus
    Header
  13. O35.10
    Maternal care for (suspected) chromosomal abnormality in fetus, unspecified +7th: 0 1 2 3 4 5 9
    Needs 7th character
  14. O35.11
    Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13 +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 1

    Inclusion terms

    • Maternal care for (suspected) chromosomal abnormality in fetus, Patau syndrome
  15. O35.12
    Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18 +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 1

    Inclusion terms

    • Maternal care for (suspected) chromosomal abnormality in fetus, Edwards syndrome
  16. O35.13
    Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21 +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 1

    Inclusion terms

    • Maternal care for (suspected) chromosomal abnormality in fetus, Down syndrome
  17. O35.14
    Maternal care for (suspected) chromosomal abnormality in fetus, Turner Syndrome +7th: 0 1 2 3 4 5 9
    Needs 7th character
  18. O35.15
    Maternal care for (suspected) chromosomal abnormality in fetus, sex chromosome abnormality +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 3

    Inclusion terms

    • Maternal care for (suspected) chromosomal abnormality in fetus, Klinefelter syndrome
    • Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy X
    • Maternal care for (suspected) chromosomal abnormality in fetus, XYY syndrome
  19. O35.19
    Maternal care for (suspected) chromosomal abnormality in fetus, other chromosomal abnormality +7th: 0 1 2 3 4 5 9
    Needs 7th character
  20. O35.A
    Maternal care for other (suspected) fetal abnormality and damage, fetal facial anomalies +7th: 0 1 2 3 4 5 9
    Needs 7th character
  21. O35.B
    Maternal care for other (suspected) fetal abnormality and damage, fetal cardiac anomalies +7th: 0 1 2 3 4 5 9
    Needs 7th character
  22. O35.C
    Maternal care for other (suspected) fetal abnormality and damage, fetal pulmonary anomalies +7th: 0 1 2 3 4 5 9
    Needs 7th character
  23. O35.D
    Maternal care for other (suspected) fetal abnormality and damage, fetal gastrointestinal anomalies +7th: 0 1 2 3 4 5 9
    Needs 7th character
  24. O35.E
    Maternal care for other (suspected) fetal abnormality and damage, fetal genitourinary anomalies +7th: 0 1 2 3 4 5 9
    Needs 7th character
  25. O35.F
    Maternal care for other (suspected) fetal abnormality and damage, fetal musculoskeletal anomalies of trunk +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Excludes2 2

    Excludes2

    • maternal care for other (suspected) fetal abnormality and damage, fetal lower extremities anomalies (O35.H) O35.H
    • maternal care for other (suspected) fetal abnormality and damage, fetal upper extremities anomalies (O35.G) O35.G
  26. O35.G
    Maternal care for other (suspected) fetal abnormality and damage, fetal upper extremities anomalies +7th: 0 1 2 3 4 5 9
    Needs 7th character
  27. O35.H
    Maternal care for other (suspected) fetal abnormality and damage, fetal lower extremities anomalies +7th: 0 1 2 3 4 5 9
    Needs 7th character
  28. O35.2
    Maternal care for (suspected) hereditary disease in fetus +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Excludes2 1

    Excludes2

    • chromosomal abnormality in fetus (O35.1-) O35.1
  29. O35.3
    Maternal care for (suspected) damage to fetus from viral disease in mother +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 2

    Inclusion terms

    • Maternal care for damage to fetus from maternal cytomegalovirus infection
    • Maternal care for damage to fetus from maternal rubella
  30. O35.4
    Maternal care for (suspected) damage to fetus from alcohol +7th: 0 1 2 3 4 5 9
    Needs 7th character
  31. O35.5
    Maternal care for (suspected) damage to fetus by drugs +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 1

    Inclusion terms

    • Maternal care for damage to fetus from drug addiction
  32. O35.6
    Maternal care for (suspected) damage to fetus by radiation +7th: 0 1 2 3 4 5 9
    Needs 7th character
  33. O35.7
    Maternal care for (suspected) damage to fetus by other medical procedures +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 5

    Inclusion terms

    • Maternal care for damage to fetus by amniocentesis
    • Maternal care for damage to fetus by biopsy procedures
    • Maternal care for damage to fetus by hematological investigation
    • Maternal care for damage to fetus by intrauterine contraceptive device
    • Maternal care for damage to fetus by intrauterine surgery
  34. O35.8
    Maternal care for other (suspected) fetal abnormality and damage +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 2

    Inclusion terms

    • Maternal care for damage to fetus from maternal listeriosis
    • Maternal care for damage to fetus from maternal toxoplasmosis
  35. O35.9
    Maternal care for (suspected) fetal abnormality and damage, unspecified +7th: 0 1 2 3 4 5 9
    Needs 7th character

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

At O35

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

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

Code also

  • any associated maternal condition

Notes that also apply

Chapter 15 instructions (Notes 6, Excludes1 1, Excludes2 4, Use additional code 1): printed on the chapter 15 page.

7th characters

7th characters for O35 defined here

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 characters for O35
7thMeaning (NCHS)
0not applicable or unspecified
1fetus 1
2fetus 2
3fetus 3
4fetus 4
5fetus 5
9other fetus

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Index entries

  • Infection, infected, infective (opportunistic)cytomegalovirus, cytomegaloviralmaternal, maternal care for (suspected) damage to fetus → O35.3
  • Rubella (German measles)maternalcare for (suspected) damage to fetus → O35.3
  • Rubella (German measles)maternalsuspected damage to fetus affecting management of pregnancy → O35.3
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)central nervous system malformation or damage → O35.00
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)malformationcentral nervous system → O35.00
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)agenesis of corpus callosum → O35.01
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)anencephaly → O35.02
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)choroid plexus cysts → O35.03
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)encephalocele → O35.04
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)holoprosencephaly → O35.05
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)hydrocephalus → O35.06
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)hydrocephaly → O35.06
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)microcephaly → O35.07
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)spina bifida → O35.08
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99) → O35.10
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)facial anomalies → O35.A
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)cardiac anomalies → O35.B
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)pulmonary anomalies → O35.C
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)gastrointestinal anomalies → O35.D
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)genitourinary anomalies → O35.E
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)hereditary disease → O35.2
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)abnormality or damage → O35.9
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)central nervous system malformation or damagespecified type NEC → O35.09
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)malformationcentral nervous systemspecified type NEC → O35.09
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Patau syndrome → O35.11
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Trisomy 13 → O35.11
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Edwards syndrome → O35.12
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Trisomy 18 → O35.12
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Down syndrome → O35.13
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Trisomy 21 → O35.13
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Turner Syndrome → O35.14
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Klinefelter syndrome → O35.15
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)sex chromosome → O35.15
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)Trisomy X → O35.15
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)XYY syndrome → O35.15
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)chromosomal abnormality (conditions in Q90-Q99)specified NEC → O35.19
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)musculoskeletal anomaliestrunk → O35.F
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)musculoskeletal anomaliesupper extremities → O35.G
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)musculoskeletal anomalieslower extremities → O35.H
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)fetal (maternal care for)damage fromdrug addiction → O35.5

15 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy