2021 ICD-10-CM Diagnosis Code O41.1290

Chorioamnionitis, unspecified trimester, not applicable or unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code Maternity Dx (12-55 years)
  • O41.1290 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Chorioamnionitis, unsp trimester, not applicable or unsp
  • The 2021 edition of ICD-10-CM O41.1290 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of O41.1290 - other international versions of ICD-10 O41.1290 may differ.
ICD-10-CM Coding Rules
  • O41.1290 is applicable to maternity patients aged 12 - 55 years inclusive.
The following code(s) above O41.1290 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 O41.1290:
  • O00-O9A
    2021 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 2021 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
Approximate Synonyms
  • Chorioamnionitis
  • Chorioamnionitis (infection of membranes around the fetus)
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.
ICD-10-CM O41.1290 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 817 Other antepartum diagnoses with o.r. Procedures with mcc
  • 818 Other antepartum diagnoses with o.r. Procedures with cc
  • 819 Other antepartum diagnoses with o.r. Procedures without cc/mcc
  • 831 Other antepartum diagnoses without o.r. Procedures with mcc
  • 832 Other antepartum diagnoses without o.r. Procedures with cc
  • 833 Other antepartum diagnoses without o.r. Procedures without cc/mcc

Convert O41.1290 to ICD-9-CM

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
  • 2021 (effective 10/1/2020): No change
ICD-10-CM Codes Adjacent To O41.1290
O41.1229 …… other fetus
O41.123 Chorioamnionitis, third trimester
O41.1230 …… not applicable or unspecified
O41.1231 …… fetus 1
O41.1232 …… fetus 2
O41.1233 …… fetus 3
O41.1234 …… fetus 4
O41.1235 …… fetus 5
O41.1239 …… other fetus
O41.129 Chorioamnionitis, unspecified trimester
O41.1290 …… not applicable or unspecified
O41.1291 …… fetus 1
O41.1292 …… fetus 2
O41.1293 …… fetus 3
O41.1294 …… fetus 4
O41.1295 …… fetus 5
O41.1299 …… other fetus
O41.14 Placentitis
O41.141 Placentitis, first trimester
O41.1410 …… not applicable or unspecified
O41.1411 …… fetus 1

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