2020 ICD-10-CM Diagnosis Code O41.12


    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • O41.12 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM O41.12 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of O41.12 - other international versions of ICD-10 O41.12 may differ.
The following code(s) above O41.12 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to O41.12:
  • O00-O9A
    2020 ICD-10-CM Range O00-O9A

    Pregnancy, childbirth and the puerperium

    • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
    • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
    • 1st trimester- less than 14 weeks 0 days
    • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
    • 3rd trimester- 28 weeks 0 days until delivery
    Type 1 Excludes
    • supervision of normal pregnancy (Z34.-)
    Type 2 Excludes
    • mental and behavioral disorders associated with the puerperium (F53.-)
    • obstetrical tetanus (A34)
    • postpartum necrosis of pituitary gland (E23.0)
    • puerperal osteomalacia (M83.0)
    Use Additional
    • code from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
    Pregnancy, childbirth and the puerperium
  • O41
    ICD-10-CM Diagnosis Code O41

    Other disorders of amniotic fluid and membranes

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
    Other disorders of amniotic fluid and membranes
Clinical Information
  • Inflammation of the fetal sac membranes.
  • Inflammation of the placental membranes (chorion; amnion) and connected tissues such as fetal blood vessels and umbilical cord. It is often associated with intrauterine ascending infections during pregnancy.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to O41.12:
  • Chorioamnionitis O41.12-
  • Infection, infected, infective (opportunistic) B99.9
    ICD-10-CM Diagnosis Code B99.9

    Unspecified infectious disease

      2016 2017 2018 2019 2020 Billable/Specific Code
    • amniotic fluid, sac or cavity O41.10-
      ICD-10-CM Diagnosis Code O41.10-

      Infection of amniotic sac and membranes, unspecified

        2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
      • chorioamnionitis O41.12-
  • Pregnancy (single) (uterine) - see also Delivery and Puerperal
    • complicated by (care of) (management affected by)
      • amnionitis O41.12-
      • chorioamnionitis O41.12-

ICD-10-CM Codes Adjacent To O41.12
O41.1035 …… fetus 5
O41.1039 …… other fetus
O41.109 Infection of amniotic sac and membranes, unspecified, unspecified trimester
O41.1090 …… not applicable or unspecified
O41.1091 …… fetus 1
O41.1092 …… fetus 2
O41.1093 …… fetus 3
O41.1094 …… fetus 4
O41.1095 …… fetus 5
O41.1099 …… other fetus
O41.12 Chorioamnionitis
O41.121 Chorioamnionitis, first trimester
O41.1210 …… not applicable or unspecified
O41.1211 …… fetus 1
O41.1212 …… fetus 2
O41.1213 …… fetus 3
O41.1214 …… fetus 4
O41.1215 …… fetus 5
O41.1219 …… other fetus
O41.122 Chorioamnionitis, second trimester
O41.1220 …… not applicable or unspecified

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.