2021 ICD-10-CM Diagnosis Code O41.00

Oligohydramnios, unspecified trimester

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • O41.00 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2021 edition of ICD-10-CM O41.00 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of O41.00 - other international versions of ICD-10 O41.00 may differ.
The following code(s) above O41.00 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 O41.00:
  • 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
  • O41.0
    ICD-10-CM Diagnosis Code O41.0


      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Applicable To
    • Oligohydramnios without rupture of membranes
Clinical Information
  • A condition of abnormally low amniotic fluid volume. Principal causes include malformations of fetal urinary tract; fetal growth retardation; gestational hypertension; nicotine poisoning; and prolonged pregnancy.
  • A lower than normal volume of amniotic fluid observed by ultrasound 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
  • 2021 (effective 10/1/2020): No change
ICD-10-CM Codes Adjacent To O41.00
O40.9 Polyhydramnios, unspecified trimester
O40.9XX0 …… not applicable or unspecified
O40.9XX1 …… fetus 1
O40.9XX2 …… fetus 2
O40.9XX3 …… fetus 3
O40.9XX4 …… fetus 4
O40.9XX5 …… fetus 5
O40.9XX9 …… other fetus
O41 Other disorders of amniotic fluid and membranes
O41.0 Oligohydramnios
O41.00 Oligohydramnios, unspecified trimester
O41.00X0 …… not applicable or unspecified
O41.00X1 …… fetus 1
O41.00X2 …… fetus 2
O41.00X3 …… fetus 3
O41.00X4 …… fetus 4
O41.00X5 …… fetus 5
O41.00X9 …… other fetus
O41.01 Oligohydramnios, first trimester
O41.01X0 …… not applicable or unspecified
O41.01X1 …… fetus 1

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