O35.00X0 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, not applicable or unspecified

BillableUnspecified

Is O35.00X0 billable?

Yes, but O35.00X0 is an unspecified code. O35.00X0 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, O35.00X0 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting O35.00X0 — the more specific alternatives are listed below.

More specific alternatives

O35.00X0 at a glance

Code	O35.00X0
Description	Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, not applicable or unspecified
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027
7th character "0"	not applicable or unspecified

What does the 7th character "0" mean in O35.00X0?

In O35.00X0, the 7th character 0 means not applicable or unspecified. The 7th character is required for O35.00X0 to be a valid, complete code.

Same condition, different episode of care — switch the 7th character:

Which MS-DRGs does O35.00X0 group to?

O35.00X0 sits in MDC 14 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

817Other Antepartum Diagnoses with O.R. Procedures with MCCsurgical
818Other Antepartum Diagnoses with O.R. Procedures with CCsurgical
819Other Antepartum Diagnoses with O.R. Procedures without CC/MCCsurgical

How is O35.00X0 listed in the Alphabetic Index?

The Alphabetic Index lists these routes under O35.00, the nearest indexed parent of O35.00X0. Use them to find the family, then select the specific code.

Pregnancy › complicated by › fetal › central nervous system malformation or damage (single) (uterine)
Pregnancy › complicated by › malformation › central nervous system (single) (uterine)

Excludes1 — never code together — inherited from Chapter 15

The conditions below can never be reported together with O35.00X0 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 O35.00X0 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 O35.00X0 to fully describe the condition. O35.00X0 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 O35.00X0, but a patient may have both at the same time. When documentation supports it, O35.00X0 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)

Excludes2 — not included here — inherited from O35.0

The conditions below are not part of O35.00X0, but a patient may have both at the same time. When documentation supports it, O35.00X0 and the excluded code may both be reported.

chromosomal abnormality in fetus (O35.1-)

Code also — inherited from O35

Two codes may be needed to describe the condition fully. Whether O35.00X0 is sequenced first depends on the reason for the encounter.

any associated maternal condition

How long has O35.00X0 existed?

O35.00X0 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.