2027 ICD-10-CM Diagnosis Code O35.2XX5Maternal care for (suspected) hereditary disease in fetus, fetus 5
O35.2XX5 is a billable ICD-10-CM diagnosis code for maternal care for (suspected) hereditary disease in fetus, fetus 5. The 7th character 5 identifies fetus 5 in a multiple gestation pregnancy. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Maternal care related to fetal conditions.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O35.2XX5.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O35.2XX5: its own notes plus those printed at O35.2, O35, and Chapter 15. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
- supervision of normal pregnancy (Z34.-)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- chromosomal abnormality in fetus (O35.1-)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
- any associated maternal condition
Notes
General instructions on how these codes are used.
- 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
7th Character
Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.
- 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 this code
- 9other fetus
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name O35.2XX5, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming O35.2XX5: they are not reported together with it, unless the two conditions are unrelated.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Genetic Disorders
Genetic disorders are health conditions caused by changes (also called mutations or variants) in your genes. Genes are parts of DNA found in your cells that carry instructions for how your body grows, develops, and functions. Many genes tell your body how to make proteins, which are needed for your body to work properly.
The full article covers:
- What are genetic disorders?
- What causes genetic disorders?
- What are the types of genetic disorders?
- What are the different ways a genetic disorder can be inherited?
- How are genetic disorders diagnosed?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O35.2XX5 to ICD-9-CMHistory
Code HistoryHistory
Questions About O35.2XX5Overview
What is the ICD-10 code for maternal care for (suspected) hereditary disease in fetus, fetus 5?
The ICD-10-CM code for maternal care for (suspected) hereditary disease in fetus, fetus 5 is O35.2XX5 (sometimes written as O352XX5). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is O35.2XX5 (Maternal care for (suspected) hereditary disease in fetus) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report maternal care for (suspected) hereditary disease in fetus, fetus 5 on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character 5 in O35.2XX5 mean?
The final character 5 identifies the fetus in a multiple gestation pregnancy: this code reports maternal care for (suspected) hereditary disease in fetus for fetus 5.
What MS-DRG does O35.2XX5 group to?
When maternal care for (suspected) hereditary disease in fetus, fetus 5 is the principal diagnosis on an inpatient stay, it groups to MS-DRG 833, 832, 831, 819, 818, 817, with relative weights from 0.5000 to 1.7586 depending on complications. Higher weights mean higher Medicare reimbursement.
Who can O35.2XX5 be reported for?
The Medicare Code Editor checks maternal care for (suspected) hereditary disease in fetus, fetus 5 against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
