DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

O36 Maternal care for other fetal problems

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

O36 is not billable. The category heads 399 billable codes in FY2027, grouped under 9 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Index → code

  • Misseddelivery → O36.4
  • Deadfetus, retained (mother) → O36.4
  • Insufficiency, insufficientplacental (mother) → O36.51-

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. O36 Maternal care for other fetal problems
Billable codes
399
Subdivisions
9
CC / MCC codes
49 / 0
HCC V28 codes
0
New FY2027
0
Index entries
71

Codes in O36

  1. O36.0
    Maternal care for rhesus isoimmunization
    Header
    Inclusion terms 1

    Inclusion terms

    • Maternal care for Rh incompatibility (with hydrops fetalis)
  2. O36.01
    Maternal care for anti-D [Rh] antibodies
    Header
  3. O36.011
    Maternal care for anti-D [Rh] antibodies, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th characterCC 0 1 2 3 4 5 9
  4. O36.012
    Maternal care for anti-D [Rh] antibodies, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th characterCC 0 1 2 3 4 5 9
  5. O36.013
    Maternal care for anti-D [Rh] antibodies, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th characterCC 0 1 2 3 4 5 9
  6. O36.019
    Maternal care for anti-D [Rh] antibodies, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  7. O36.09
    Maternal care for other rhesus isoimmunization
    Header
  8. O36.091
    Maternal care for other rhesus isoimmunization, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th characterCC 0 1 2 3 4 5 9
  9. O36.092
    Maternal care for other rhesus isoimmunization, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th characterCC 0 1 2 3 4 5 9
  10. O36.093
    Maternal care for other rhesus isoimmunization, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th characterCC 0 1 2 3 4 5 9
  11. O36.099
    Maternal care for other rhesus isoimmunization, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  12. O36.1
    Maternal care for other isoimmunization
    Header
    Inclusion terms 1

    Inclusion terms

    • Maternal care for ABO isoimmunization
  13. O36.11
    Maternal care for Anti-A sensitization
    Header
    Inclusion terms 1

    Inclusion terms

    • Maternal care for isoimmunization NOS (with hydrops fetalis)
  14. O36.111
    Maternal care for Anti-A sensitization, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  15. O36.112
    Maternal care for Anti-A sensitization, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  16. O36.113
    Maternal care for Anti-A sensitization, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  17. O36.119
    Maternal care for Anti-A sensitization, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  18. O36.19
    Maternal care for other isoimmunization
    Header
    Inclusion terms 1

    Inclusion terms

    • Maternal care for Anti-B sensitization
  19. O36.191
    Maternal care for other isoimmunization, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  20. O36.192
    Maternal care for other isoimmunization, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  21. O36.193
    Maternal care for other isoimmunization, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  22. O36.199
    Maternal care for other isoimmunization, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  23. O36.2
    Maternal care for hydrops fetalis
    Header
    Inclusion terms 2, Excludes1 2

    Inclusion terms

    • Maternal care for hydrops fetalis NOS
    • Maternal care for hydrops fetalis not associated with isoimmunization

    Excludes1

    • hydrops fetalis associated with ABO isoimmunization (O36.1-) O36.1
    • hydrops fetalis associated with rhesus isoimmunization (O36.0-) O36.0
  24. O36.20
    Maternal care for hydrops fetalis, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  25. O36.21
    Maternal care for hydrops fetalis, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  26. O36.22
    Maternal care for hydrops fetalis, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  27. O36.23
    Maternal care for hydrops fetalis, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  28. O36.4
    Maternal care for intrauterine death +7th: 0 1 2 3 4 5 9
    Needs 7th characterCC 0 1 2 3 4 5 9
    Inclusion terms 4, Excludes1 2

    Inclusion terms

    • Maternal care for intrauterine fetal death NOS
    • Maternal care for intrauterine fetal death after completion of 20 weeks of gestation
    • Maternal care for late fetal death
    • Maternal care for missed delivery

    Excludes1

    • missed abortion (O02.1) O02.1
    • stillbirth (P95) P95
  29. O36.5
    Maternal care for known or suspected poor fetal growth
    Header
  30. O36.51
    Maternal care for known or suspected placental insufficiency
    Header
  31. O36.511
    Maternal care for known or suspected placental insufficiency, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  32. O36.512
    Maternal care for known or suspected placental insufficiency, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  33. O36.513
    Maternal care for known or suspected placental insufficiency, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  34. O36.519
    Maternal care for known or suspected placental insufficiency, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  35. O36.59
    Maternal care for other known or suspected poor fetal growth
    Header
    Inclusion terms 2

    Inclusion terms

    • Maternal care for known or suspected light-for-dates NOS
    • Maternal care for known or suspected small-for-dates NOS
  36. O36.591
    Maternal care for other known or suspected poor fetal growth, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  37. O36.592
    Maternal care for other known or suspected poor fetal growth, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  38. O36.593
    Maternal care for other known or suspected poor fetal growth, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  39. O36.599
    Maternal care for other known or suspected poor fetal growth, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  40. O36.6
    Maternal care for excessive fetal growth
    Header
    Inclusion terms 1

    Inclusion terms

    • Maternal care for known or suspected large-for-dates
  41. O36.60
    Maternal care for excessive fetal growth, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  42. O36.61
    Maternal care for excessive fetal growth, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  43. O36.62
    Maternal care for excessive fetal growth, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  44. O36.63
    Maternal care for excessive fetal growth, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  45. O36.7
    Maternal care for viable fetus in abdominal pregnancy
    Header
  46. O36.70
    Maternal care for viable fetus in abdominal pregnancy, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  47. O36.71
    Maternal care for viable fetus in abdominal pregnancy, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  48. O36.72
    Maternal care for viable fetus in abdominal pregnancy, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  49. O36.73
    Maternal care for viable fetus in abdominal pregnancy, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  50. O36.8
    Maternal care for other specified fetal problems
    Header
  51. O36.80
    Pregnancy with inconclusive fetal viability +7th: 0 1 2 3 4 5 9
    Needs 7th character
    Inclusion terms 1

    Inclusion terms

    • Encounter to determine fetal viability of pregnancy
  52. O36.81
    Decreased fetal movements
    Header
  53. O36.812
    Decreased fetal movements, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  54. O36.813
    Decreased fetal movements, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  55. O36.819
    Decreased fetal movements, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  56. O36.82
    Fetal anemia and thrombocytopenia
    Header
  57. O36.821
    Fetal anemia and thrombocytopenia, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  58. O36.822
    Fetal anemia and thrombocytopenia, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  59. O36.823
    Fetal anemia and thrombocytopenia, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  60. O36.829
    Fetal anemia and thrombocytopenia, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  61. O36.83
    Maternal care for abnormalities of the fetal heart rate or rhythm
    Header
    Inclusion terms 7

    Inclusion terms

    • Maternal care for depressed fetal heart rate tones
    • Maternal care for fetal bradycardia
    • Maternal care for fetal heart rate abnormal variability
    • Maternal care for fetal heart rate decelerations
    • Maternal care for fetal heart rate irregularity
    • Maternal care for fetal tachycardia
    • Maternal care for non-reassuring fetal heart rate or rhythm
  62. O36.831
    Maternal care for abnormalities of the fetal heart rate or rhythm, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  63. O36.832
    Maternal care for abnormalities of the fetal heart rate or rhythm, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  64. O36.833
    Maternal care for abnormalities of the fetal heart rate or rhythm, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  65. O36.839
    Maternal care for abnormalities of the fetal heart rate or rhythm, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  66. O36.89
    Maternal care for other specified fetal problems
    Header
  67. O36.891
    Maternal care for other specified fetal problems, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  68. O36.892
    Maternal care for other specified fetal problems, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  69. O36.893
    Maternal care for other specified fetal problems, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  70. O36.899
    Maternal care for other specified fetal problems, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  71. O36.9
    Maternal care for fetal problem, unspecified
    Header
  72. O36.90
    Maternal care for fetal problem, unspecified, unspecified trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  73. O36.91
    Maternal care for fetal problem, unspecified, first trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  74. O36.92
    Maternal care for fetal problem, unspecified, second trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character
  75. O36.93
    Maternal care for fetal problem, unspecified, third trimester +7th: 0 1 2 3 4 5 9
    Needs 7th character

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

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 O36

Includes

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

Excludes1

  • encounter for suspected maternal and fetal conditions ruled out (Z03.7-) Z03.7
  • placental transfusion syndromes (O43.0-) O43.0

Excludes2

  • labor and delivery complicated by fetal stress (O77.-) O77

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 O36 defined here

One of the following 7th characters is to be assigned to each code under category O36. 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 O36 that has a 7th character of 1 through 9.

7th characters for O36
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

  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis) → O36.11-
  • Deadfetus, retained (mother) → O36.4
  • Delivery (childbirth) (labor)missed (at or near term) → O36.4
  • Misseddelivery → O36.4
  • Insufficiency, insufficientplacental (mother) → O36.51-
  • Light-for-dates (infant)affecting management of pregnancy → O36.59-
  • Large-for-dates NEC (infant) (4000g to 4499g)affecting management of pregnancy → O36.6-
  • Encounter (with health service) (for)to determine fetal viability of pregnancy → O36.80
  • ImmunizationRh factoraffecting management of pregnancy NEC → O36.09-
  • IncompatibilityRh (blood group) (factor)affecting management of pregnancy NEC → O36.09-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)anti-c sensitization → O36.09-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)anti-C sensitization → O36.09-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)anti-e sensitization → O36.09-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)anti-E sensitization → O36.09-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)Rh NEC → O36.09-
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)Rh immunization, incompatibility or sensitization NEC → O36.09-
  • Rh (factor)incompatibility, immunization or sensitizationaffecting management of pregnancy NEC → O36.09-
  • IncompatibilityABOaffecting management of pregnancy → O36.11-
  • Incompatibilityblood (group) (Duffy) (K) (Kell) (Kidd) (Lewis) (M) (S) NECaffecting management of pregnancy → O36.11-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)anti-A sensitization → O36.11-
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)isoimmunization → O36.11-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)anti-B sensitization → O36.19-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)specified NEC → O36.19-
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)death of fetus (near term) → O36.4
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)intrauterine fetal death (near term) → O36.4
  • Retentiondeadfetus (at or near term) (mother) → O36.4
  • Retentionfetusdead → O36.4
  • Delivery (childbirth) (labor)cesarean (for)placental insufficiency → O36.51-
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)placental insufficiency → O36.51-
  • Restrictiongrowthfetal → O36.59-
  • Pregnancy (single) (uterine)abdominal (ectopic)with viable fetus → O36.7-
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)inconclusive fetal viability → O36.80
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)decreased fetal movement → O36.81-
  • ImmunizationRh factoraffecting management of pregnancy NECanti-D antibody → O36.01-
  • IncompatibilityRh (blood group) (factor)affecting management of pregnancy NECanti-D antibody → O36.01-
  • Isoimmunization NECaffecting management of pregnancy (ABO) (with hydrops fetalis)Rh NECanti-D antibody → O36.01-
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)Rh immunization, incompatibility or sensitization NECanti-D antibody → O36.01-
  • Rh (factor)incompatibility, immunization or sensitizationaffecting management of pregnancy NECanti-D antibody → O36.01-
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)isoimmunizationRh → O36.09-
  • IncompatibilityABOaffecting management of pregnancyanti-A sensitization → O36.11-

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

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

Hierarchy