O35.03X9 — Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, other fetus
Is O35.03X9 billable?
Yes — O35.03X9 is billable for FY2027. O35.03X9 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. O35.03X9 may be submitted for encounters from October 1, 2026 through September 30, 2027.
O35.03X9 at a glance
| Code | O35.03X9 |
|---|---|
| Description | Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, other fetus |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "9" | other fetus |
What does the 7th character "9" mean in O35.03X9?
In O35.03X9, the 7th character 9 means other fetus. The 7th character is required for O35.03X9 to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does O35.03X9 group to?
O35.03X9 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 O35.03X9 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under O35.03, the nearest indexed parent of O35.03X9. Use them to find the family, then select the specific code.
- Pregnancy › complicated by › fetal › choroid plexus cysts (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O35.03X9 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 O35.03X9 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 O35.03X9 to fully describe the condition. O35.03X9 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 O35.03X9, but a patient may have both at the same time. When documentation supports it, O35.03X9 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O35.0
The conditions below are not part of O35.03X9, but a patient may have both at the same time. When documentation supports it, O35.03X9 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 O35.03X9 is sequenced first depends on the reason for the encounter.
- any associated maternal condition
How long has O35.03X9 existed?
O35.03X9 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.