ICDcodes.org
FY2027

O35.12 — Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18

Not billable

Is O35.12 billable?

No — O35.12 is a non-billable header code. O35.12 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 7 billable codes beneath O35.12.

O35.12 at a glance

CodeO35.12
DescriptionMaternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18
BillableNo — header code
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

How is O35.12 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to O35.12. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Pregnancy › complicated by › fetal › chromosomal abnormality › Edwards syndrome (single) (uterine)
  • Pregnancy › complicated by › fetal › chromosomal abnormality › Trisomy 18 (single) (uterine)

Inclusion terms

Alternative wording in documentation that is classified to O35.12.

  • Maternal care for (suspected) chromosomal abnormality in fetus, Edwards syndrome

Excludes1 — never code together — inherited from Chapter 15

The conditions below can never be reported together with O35.12 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • supervision of normal pregnancy (Z34.-)

Excludes1 — never code together — inherited from O35

The conditions below can never be reported together with O35.12 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

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

Use additional code — inherited from Chapter 15

Report an additional code alongside O35.12 to fully describe the condition. O35.12 is sequenced first.

  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Excludes2 — not included here — inherited from Chapter 15

The conditions below are not part of O35.12, but a patient may have both at the same time. When documentation supports it, O35.12 and the excluded code may both be reported.

  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Code also — inherited from O35

Two codes may be needed to describe the condition fully. Whether O35.12 is sequenced first depends on the reason for the encounter.

  • any associated maternal condition

What codes fall under O35.12? (7)

How long has O35.12 existed?

O35.12 first appears in FY2023.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

What other codes are in the O35.1 family? (6)