2020 ICD-10-CM Diagnosis Code O33.5

Maternal care for disproportion due to unusually large fetus

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • O33.5 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 O33.5 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of O33.5 - other international versions of ICD-10 O33.5 may differ.
Applicable To
  • Maternal care for disproportion due to disproportion of fetal origin with normally formed fetus
  • Maternal care for disproportion due to fetal disproportion NOS
The following code(s) above O33.5 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 O33.5:
  • 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
  • O33
    ICD-10-CM Diagnosis Code O33

    Maternal care for disproportion

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    • the listed conditions as a reason for observation, hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor
    Type 1 Excludes
    • disproportion with obstructed labor (O65-O66)
    Maternal care for disproportion
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 O33.5:
  • Delivery (childbirth) (labor)
    • cesarean (for)
      • increased size, fetus O33.5
      • oversize fetus O33.5
  • Pregnancy (single) (uterine) - see also Delivery and Puerperal
    • complicated by (care of) (management affected by)
      • oversize fetus O33.5

ICD-10-CM Codes Adjacent To O33.5
O33.3XX5 …… fetus 5
O33.3XX9 …… other fetus
O33.4 Maternal care for disproportion of mixed maternal and fetal origin
O33.4XX0 …… not applicable or unspecified
O33.4XX1 …… fetus 1
O33.4XX2 …… fetus 2
O33.4XX3 …… fetus 3
O33.4XX4 …… fetus 4
O33.4XX5 …… fetus 5
O33.4XX9 …… other fetus
O33.5 Maternal care for disproportion due to unusually large fetus
O33.5XX0 …… not applicable or unspecified
O33.5XX1 …… fetus 1
O33.5XX2 …… fetus 2
O33.5XX3 …… fetus 3
O33.5XX4 …… fetus 4
O33.5XX5 …… fetus 5
O33.5XX9 …… other fetus
O33.6 Maternal care for disproportion due to hydrocephalic fetus
O33.6XX0 …… not applicable or unspecified
O33.6XX1 …… fetus 1

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