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O35Non-billableSave

O35 - Maternal care for known or suspected fetal abnormality and damage

ICD-10-CM Chapter 15: Pregnancy, childbirth and the puerperium · O30-O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48) · Top-level category · FY2027

Coding Guidance

O35 is a non-billable heading. Report one of the 18 more specific codes below.

7th Character

One of the following 7th characters is to be assigned to each code under category O35. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O35 that has a 7th character of 1 through 9.

  • 0not applicable or unspecified
  • 1fetus 1
  • 2fetus 2
  • 3fetus 3
  • 4fetus 4
  • 5fetus 5
  • 9other fetus

Includes, Excludes and Coding Notes

IncludesFrom O35

Conditions this code covers.

  • the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy
Excludes 1 — Not Coded HereFrom O35

Mutually exclusive: these conditions are never reported together with this code.

  • encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Code AlsoFrom O35

Report an additional code when both conditions apply.

  • any associated maternal condition
Excludes 1 — Not Coded HereFrom Chapter O00-O9A

Mutually exclusive: these conditions are never reported together with this code.

  • supervision of normal pregnancy (Z34.-)
Excludes 2 — Not Included HereFrom Chapter O00-O9A

Not part of this code; report both codes when the patient has both conditions.

  • 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 CodeFrom Chapter O00-O9A

Add a secondary code to identify the associated condition or cause when it is documented.

  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
NotesFrom Chapter O00-O9A

Instructional notes from the ICD-10-CM tabular list.

  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • 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

More Specific Codes (18)

O35.0Maternal care for (suspected) central nervous system malformation in fetus→O35.1Maternal care for (suspected) chromosomal abnormality in fetus→O35.2Maternal care for (suspected) hereditary disease in fetus→O35.3Maternal care for (suspected) damage to fetus from viral disease in mother→O35.4Maternal care for (suspected) damage to fetus from alcohol→O35.5Maternal care for (suspected) damage to fetus by drugs→O35.6Maternal care for (suspected) damage to fetus by radiation→O35.7Maternal care for (suspected) damage to fetus by other medical procedures→O35.8Maternal care for other (suspected) fetal abnormality and damage→O35.9Maternal care for (suspected) fetal abnormality and damage, unspecified→O35.AMaternal care for other (suspected) fetal abnormality and damage, fetal facial anomalies→O35.BMaternal care for other (suspected) fetal abnormality and damage, fetal cardiac anomalies→O35.CMaternal care for other (suspected) fetal abnormality and damage, fetal pulmonary anomalies→O35.DMaternal care for other (suspected) fetal abnormality and damage, fetal gastrointestinal anomalies→O35.EMaternal care for other (suspected) fetal abnormality and damage, fetal genitourinary anomalies→O35.FMaternal care for other (suspected) fetal abnormality and damage, fetal musculoskeletal anomalies of trunk→O35.GMaternal care for other (suspected) fetal abnormality and damage, fetal upper extremities anomalies→O35.HMaternal care for other (suspected) fetal abnormality and damage, fetal lower extremities anomalies→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with O35.