DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

O99 Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

  • Header · not billable

O99 is not billable. The category heads 96 billable codes in FY2027, grouped under 9 subdivisions.

Index → code

  • Valsuani's disease → O99.03
  • Hypopituitarism (juvenile)postpartum → O99.285
  • Puerperal, puerperium (complicated by, complications)stroke → O99.43

Where it sits

  1. Chapter 15 Pregnancy, childbirth and the puerperium (O00-O9A)
  2. O94-O9A Other obstetric conditions, not elsewhere classified (O94-O9A)
  3. O99 Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
Billable codes
96
Subdivisions
9
CC / MCC codes
20 / 1
HCC V28 codes
0
New FY2027
0
Index entries
139

Codes in O99

  1. O99.0
    Anemia complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 1, Excludes1 2

    Inclusion terms

    Excludes1

    • anemia arising in the puerperium (O90.81) O90.81
    • postpartum anemia NOS (O90.81) O90.81
  2. O99.01
    Anemia complicating pregnancy
    Header
  3. O99.011
    Anemia complicating pregnancy, first trimester
    Billable
  4. O99.012
    Anemia complicating pregnancy, second trimester
    Billable
  5. O99.013
    Anemia complicating pregnancy, third trimester
    Billable
  6. O99.019
    Anemia complicating pregnancy, unspecified trimester
    Billable
  7. O99.02
    Anemia complicating childbirth
    Billable
  8. O99.03
    Anemia complicating the puerperium
    Billable
    Excludes1 1

    Excludes1

    • postpartum anemia not pre-existing prior to delivery (O90.81) O90.81
  9. O99.1
    Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    Excludes1

  10. O99.11
    Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy
    Header
  11. O99.111
    Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, first trimester
    BillableCC
  12. O99.112
    Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, second trimester
    BillableCC
  13. O99.113
    Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, third trimester
    BillableCC
  14. O99.119
    Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, unspecified trimester
    BillableCC
  15. O99.12
    Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth
    BillableCC
  16. O99.13
    Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating the puerperium
    BillableCC
  17. O99.2
    Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 1, Excludes2 3

    Inclusion terms

    Excludes2

    • diabetes mellitus (O24.-) O24
    • malnutrition (O25.-) O25
    • postpartum thyroiditis (O90.5) O90.5
  18. O99.21
    Obesity complicating pregnancy, childbirth, and the puerperium
    Header
    Use additional code 1

    Use additional code

    • code to identify the type of obesity (E66.-) E66
  19. O99.210
    Obesity complicating pregnancy, unspecified trimester
    Billable
  20. O99.211
    Obesity complicating pregnancy, first trimester
    Billable
  21. O99.212
    Obesity complicating pregnancy, second trimester
    Billable
  22. O99.213
    Obesity complicating pregnancy, third trimester
    Billable
  23. O99.214
    Obesity complicating childbirth
    Billable
  24. O99.215
    Obesity complicating the puerperium
    Billable
  25. O99.28
    Other endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium
    Header
  26. O99.280
    Endocrine, nutritional and metabolic diseases complicating pregnancy, unspecified trimester
    Billable
  27. O99.281
    Endocrine, nutritional and metabolic diseases complicating pregnancy, first trimester
    Billable
  28. O99.282
    Endocrine, nutritional and metabolic diseases complicating pregnancy, second trimester
    Billable
  29. O99.283
    Endocrine, nutritional and metabolic diseases complicating pregnancy, third trimester
    Billable
  30. O99.284
    Endocrine, nutritional and metabolic diseases complicating childbirth
    Billable
  31. O99.285
    Endocrine, nutritional and metabolic diseases complicating the puerperium
    Billable
  32. O99.3
    Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium
    Header
  33. O99.31
    Alcohol use complicating pregnancy, childbirth, and the puerperium
    Header
    Use additional code 1

    Use additional code

    • code(s) from F10 to identify manifestations of the alcohol use F10
  34. O99.310
    Alcohol use complicating pregnancy, unspecified trimester
    Billable
  35. O99.311
    Alcohol use complicating pregnancy, first trimester
    Billable
  36. O99.312
    Alcohol use complicating pregnancy, second trimester
    Billable
  37. O99.313
    Alcohol use complicating pregnancy, third trimester
    Billable
  38. O99.314
    Alcohol use complicating childbirth
    Billable
  39. O99.315
    Alcohol use complicating the puerperium
    Billable
  40. O99.32
    Drug use complicating pregnancy, childbirth, and the puerperium
    Header
    Use additional code 1

    Use additional code

    • code(s) from F11-F16 and F18-F19 to identify manifestations of the drug use F11 F16 F18 F19
  41. O99.320
    Drug use complicating pregnancy, unspecified trimester
    Billable
  42. O99.321
    Drug use complicating pregnancy, first trimester
    BillableCC
  43. O99.322
    Drug use complicating pregnancy, second trimester
    BillableCC
  44. O99.323
    Drug use complicating pregnancy, third trimester
    BillableCC
  45. O99.324
    Drug use complicating childbirth
    BillableCC
  46. O99.325
    Drug use complicating the puerperium
    BillableCC
  47. O99.33
    Tobacco use disorder complicating pregnancy, childbirth, and the puerperium
    Header
    Inclusion terms 1, Use additional code 1

    Inclusion terms

    • Smoking complicating pregnancy, childbirth, and the puerperium

    Use additional code

    • code from category F17 to identify type of tobacco nicotine dependence F17
  48. O99.330
    Smoking (tobacco) complicating pregnancy, unspecified trimester
    Billable
  49. O99.331
    Smoking (tobacco) complicating pregnancy, first trimester
    Billable
  50. O99.332
    Smoking (tobacco) complicating pregnancy, second trimester
    Billable
  51. O99.333
    Smoking (tobacco) complicating pregnancy, third trimester
    Billable
  52. O99.334
    Smoking (tobacco) complicating childbirth
    Billable
  53. O99.335
    Smoking (tobacco) complicating the puerperium
    Billable
  54. O99.34
    Other mental disorders complicating pregnancy, childbirth, and the puerperium
    Header
    Inclusion terms 1, Excludes2 3

    Inclusion terms

    Excludes2

    • postpartum mood disturbance (O90.6) O90.6
    • postnatal psychosis (F53.1) F53.1
    • puerperal psychosis (F53.1) F53.1
  55. O99.340
    Other mental disorders complicating pregnancy, unspecified trimester
    Billable
  56. O99.341
    Other mental disorders complicating pregnancy, first trimester
    Billable
  57. O99.342
    Other mental disorders complicating pregnancy, second trimester
    Billable
  58. O99.343
    Other mental disorders complicating pregnancy, third trimester
    Billable
  59. O99.344
    Other mental disorders complicating childbirth
    Billable
  60. O99.345
    Other mental disorders complicating the puerperium
    Billable
  61. O99.35
    Diseases of the nervous system complicating pregnancy, childbirth, and the puerperium
    Header
    Inclusion terms 1, Excludes2 1

    Inclusion terms

    Excludes2

    • pregnancy related peripheral neuritis (O26.8-) O26.8
  62. O99.350
    Diseases of the nervous system complicating pregnancy, unspecified trimester
    Billable
  63. O99.351
    Diseases of the nervous system complicating pregnancy, first trimester
    Billable
  64. O99.352
    Diseases of the nervous system complicating pregnancy, second trimester
    Billable
  65. O99.353
    Diseases of the nervous system complicating pregnancy, third trimester
    Billable
  66. O99.354
    Diseases of the nervous system complicating childbirth
    BillableCC
  67. O99.355
    Diseases of the nervous system complicating the puerperium
    BillableCC
  68. O99.4
    Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 1, Excludes1 1, Excludes2 4

    Inclusion terms

    Excludes1

    • peripartum cardiomyopathy (O90.3) O90.3

    Excludes2

    • hypertensive disorders (O10-O16) O10 O16
    • obstetric embolism (O88.-) O88
    • venous complications and cerebrovenous sinus thrombosis in labor, childbirth and the puerperium (O87.-) O87
    • venous complications and cerebrovenous sinus thrombosis in pregnancy (O22.-) O22
  69. O99.41
    Diseases of the circulatory system complicating pregnancy
    Header
  70. O99.411
    Diseases of the circulatory system complicating pregnancy, first trimester
    BillableCC
  71. O99.412
    Diseases of the circulatory system complicating pregnancy, second trimester
    BillableCC
  72. O99.413
    Diseases of the circulatory system complicating pregnancy, third trimester
    BillableCC
  73. O99.419
    Diseases of the circulatory system complicating pregnancy, unspecified trimester
    Billable
  74. O99.42
    Diseases of the circulatory system complicating childbirth
    BillableMCC
  75. O99.43
    Diseases of the circulatory system complicating the puerperium
    BillableCC
  76. O99.5
    Diseases of the respiratory system complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 1

    Inclusion terms

  77. O99.51
    Diseases of the respiratory system complicating pregnancy
    Header
  78. O99.511
    Diseases of the respiratory system complicating pregnancy, first trimester
    Billable
  79. O99.512
    Diseases of the respiratory system complicating pregnancy, second trimester
    Billable
  80. O99.513
    Diseases of the respiratory system complicating pregnancy, third trimester
    Billable
  81. O99.519
    Diseases of the respiratory system complicating pregnancy, unspecified trimester
    Billable
  82. O99.52
    Diseases of the respiratory system complicating childbirth
    Billable
  83. O99.53
    Diseases of the respiratory system complicating the puerperium
    Billable
  84. O99.6
    Diseases of the digestive system complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 1, Excludes2 2

    Inclusion terms

    • Conditions in K00-K93 K00

    Excludes2

    • hemorrhoids in pregnancy (O22.4-) O22.4
    • liver and biliary tract disorders in pregnancy, childbirth and the puerperium (O26.6-) O26.6
  85. O99.61
    Diseases of the digestive system complicating pregnancy
    Header
  86. O99.611
    Diseases of the digestive system complicating pregnancy, first trimester
    Billable
  87. O99.612
    Diseases of the digestive system complicating pregnancy, second trimester
    Billable
  88. O99.613
    Diseases of the digestive system complicating pregnancy, third trimester
    Billable
  89. O99.619
    Diseases of the digestive system complicating pregnancy, unspecified trimester
    Billable
  90. O99.62
    Diseases of the digestive system complicating childbirth
    Billable
  91. O99.63
    Diseases of the digestive system complicating the puerperium
    Billable
  92. O99.7
    Diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 1, Excludes2 2

    Inclusion terms

    Excludes2

    • herpes gestationis (O26.4) O26.4
    • pruritic urticarial papules and plaques of pregnancy (PUPPP) (O26.86) O26.86
  93. O99.71
    Diseases of the skin and subcutaneous tissue complicating pregnancy
    Header
  94. O99.711
    Diseases of the skin and subcutaneous tissue complicating pregnancy, first trimester
    Billable
  95. O99.712
    Diseases of the skin and subcutaneous tissue complicating pregnancy, second trimester
    Billable
  96. O99.713
    Diseases of the skin and subcutaneous tissue complicating pregnancy, third trimester
    Billable
  97. O99.719
    Diseases of the skin and subcutaneous tissue complicating pregnancy, unspecified trimester
    Billable
  98. O99.72
    Diseases of the skin and subcutaneous tissue complicating childbirth
    Billable
  99. O99.73
    Diseases of the skin and subcutaneous tissue complicating the puerperium
    Billable
  100. O99.8
    Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 1, Excludes2 6, Use additional code 1

    Inclusion terms

    Excludes2

    • genitourinary infections in pregnancy (O23.-) O23
    • infection of genitourinary tract following delivery (O86.1-O86.4) O86.1 O86.4
    • malignant neoplasm complicating pregnancy, childbirth and the puerperium (O9A.1-) O9A.1
    • maternal care for known or suspected abnormality of maternal pelvic organs (O34.-) O34
    • postpartum acute kidney failure (O90.49) O90.49
    • traumatic injuries in pregnancy (O9A.2-) O9A.2

    Use additional code

    • code to identify condition
  101. O99.81
    Abnormal glucose complicating pregnancy, childbirth and the puerperium
    Header
    Excludes1 1

    Excludes1

    • gestational diabetes (O24.4-) O24.4
  102. O99.810
    Abnormal glucose complicating pregnancy
    Billable
  103. O99.814
    Abnormal glucose complicating childbirth
    Billable
  104. O99.815
    Abnormal glucose complicating the puerperium
    Billable
  105. O99.82
    Streptococcus B carrier state complicating pregnancy, childbirth and the puerperium
    Header
    Excludes1 1

    Excludes1

    • Carrier of streptococcus group B (GBS) in a nonpregnant woman (Z22.330) Z22.330
  106. O99.820
    Streptococcus B carrier state complicating pregnancy
    Billable
  107. O99.824
    Streptococcus B carrier state complicating childbirth
    Billable
  108. O99.825
    Streptococcus B carrier state complicating the puerperium
    Billable
  109. O99.83
    Other infection carrier state complicating pregnancy, childbirth and the puerperium
    Header
    Use additional code 1

    Use additional code

    • code to identify the carrier state (Z22.-) Z22
  110. O99.830
    Other infection carrier state complicating pregnancy
    BillableCC
  111. O99.834
    Other infection carrier state complicating childbirth
    BillableCC
  112. O99.835
    Other infection carrier state complicating the puerperium
    BillableCC
  113. O99.84
    Bariatric surgery status complicating pregnancy, childbirth and the puerperium
    Header
    Inclusion terms 3

    Inclusion terms

    • Gastric banding status complicating pregnancy, childbirth and the puerperium
    • Gastric bypass status for obesity complicating pregnancy, childbirth and the puerperium
    • Obesity surgery status complicating pregnancy, childbirth and the puerperium
  114. O99.840
    Bariatric surgery status complicating pregnancy, unspecified trimester
    Billable
  115. O99.841
    Bariatric surgery status complicating pregnancy, first trimester
    Billable
  116. O99.842
    Bariatric surgery status complicating pregnancy, second trimester
    Billable
  117. O99.843
    Bariatric surgery status complicating pregnancy, third trimester
    Billable
  118. O99.844
    Bariatric surgery status complicating childbirth
    Billable
  119. O99.845
    Bariatric surgery status complicating the puerperium
    Billable
  120. O99.89
    Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium
    Header
  121. O99.891
    Other specified diseases and conditions complicating pregnancy
    Billable
  122. O99.892
    Other specified diseases and conditions complicating childbirth
    Billable
  123. O99.893
    Other specified diseases and conditions complicating puerperium
    Billable

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.

Instructions

At O99

Includes

  • conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care

Excludes2

  • when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36) O35 O36

Use additional code

  • code to identify specific condition

Notes that also apply

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

Index entries

  • Valsuani's disease → O99.03
  • Puerperal, puerperium (complicated by, complications)blood disorder NEC → O99.13
  • Puerperal, puerperium (complicated by, complications)coagulopathy (any) → O99.13
  • Puerperal, puerperium (complicated by, complications)obesity (pre-existing prior to pregnancy) → O99.215
  • Hypopituitarism (juvenile)postpartum → O99.285
  • Puerperal, puerperium (complicated by, complications)endocrine, nutritional or metabolic disease NEC → O99.285
  • Puerperal, puerperium (complicated by, complications)alcohol use → O99.315
  • Puerperal, puerperium (complicated by, complications)drug use → O99.325
  • Puerperal, puerperium (complicated by, complications)mental disorder NEC → O99.345
  • Puerperal, puerperium (complicated by, complications)hemiplegia, cerebral → O99.355
  • Puerperal, puerperium (complicated by, complications)nervous system disorder → O99.355
  • Puerperal, puerperium (complicated by, complications)apoplexy → O99.43
  • Puerperal, puerperium (complicated by, complications)cerebrovascular disorder (conditions in I60-I69) → O99.43
  • Puerperal, puerperium (complicated by, complications)circulatory system disorder → O99.43
  • Puerperal, puerperium (complicated by, complications)hematoma, subdural → O99.43
  • Puerperal, puerperium (complicated by, complications)ischemia, cerebral → O99.43
  • Puerperal, puerperium (complicated by, complications)monoplegia, cerebral → O99.43
  • Puerperal, puerperium (complicated by, complications)occlusion, precerebral artery → O99.43
  • Puerperal, puerperium (complicated by, complications)paralytic stroke → O99.43
  • Puerperal, puerperium (complicated by, complications)stroke → O99.43
  • Puerperal, puerperium (complicated by, complications)respiratory disease NEC → O99.53
  • Puerperal, puerperium (complicated by, complications)digestive system disorder → O99.63
  • Puerperal, puerperium (complicated by, complications)gastrointestinal disease NEC → O99.63
  • Puerperal, puerperium (complicated by, complications)skin disorder NEC → O99.73
  • Puerperal, puerperium (complicated by, complications)abnormal glucose (tolerance test) → O99.815
  • Puerperal, puerperium (complicated by, complications)bariatric surgery status → O99.845
  • Puerperal, puerperium (complicated by, complications)gastric banding status → O99.845
  • Puerperal, puerperium (complicated by, complications)gastric bypass status → O99.845
  • Puerperal, puerperium (complicated by, complications)obesity surgery status → O99.845
  • Puerperal, puerperium (complicated by, complications)specified condition NEC → O99.893
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)anemia (conditions in D50-D64) (pre-existing) → O99.01-
  • Puerperal, puerperium (complicated by, complications)anemiapre-existing (pre-pregnancy) → O99.03
  • Puerperal, puerperium (complicated by, complications)diseaseValsuani's → O99.03
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)immune disorders NEC (conditions in D80-D89) → O99.11-
  • Defect, defectivecoagulation (factor)postpartum → O99.13
  • Obesitycomplicatingpregnancy → O99.21-
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)obesity (pre-existing) → O99.21-
  • Obesitycomplicatingchildbirth → O99.214
  • Obesitycomplicatingpuerperium → O99.215
  • Pregnancy (single) (uterine)complicated by (care of) (management affected by)endocrine diseases NEC → O99.28-

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

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

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