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ICD-10-CM 2027 diagnosis code

O35.3XX0Maternal care for (suspected) damage to fetus from viral disease in mother, not applicable or unspecified

✓ Billable / specificRequires 7th characterMaternity · age 9–64Female only

O35.3XX0 is a valid, billable ICD-10-CM code for maternal care for (suspected) damage to fetus from viral disease in mother, not applicable or unspecified. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Matern care for damag to fts from viral dis in mother, unsp

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O35.3XX0

O35.3XX0 is the ICD-10-CM diagnosis code for maternal care for (suspected) damage to fetus from viral disease in mother, not applicable or unspecified. It belongs to category O35 (maternal care for known or suspected fetal abnormality and damage), block O30-O48 (maternal care related to the fetus and amniotic cavity and possible delivery problems) and chapter 15 (pregnancy, childbirth and the puerperium). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "0" means not applicable or unspecified.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 817 (Other Antepartum Diagnoses with O.R. Procedures with MCC, relative weight 2.0534), DRG 818 (Other Antepartum Diagnoses with O.R. Procedures with CC, relative weight 1.2942), DRG 819 (Other Antepartum Diagnoses with O.R. Procedures without CC/MCC, relative weight 0.7739), DRG 831 (Other Antepartum Diagnoses without O.R. Procedures with MCC, relative weight 1.1558), DRG 832 (Other Antepartum Diagnoses without O.R. Procedures with CC, relative weight 0.7585) and DRG 833 (Other Antepartum Diagnoses without O.R. Procedures without CC/MCC, relative weight 0.5002), in MDC 14 (Pregnancy, Childbirth and the Puerperium), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

The Medicare Code Editor treats this as a maternity diagnosis, expected only for patients age 9 through 64.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 655.31 (suspected damage to fetus from viral disease in the mother, affecting management of mother, delivered, with or without mention of antepartum condition) and 655.33 (suspected damage to fetus from viral disease in the mother, affecting management of mother, antepartum condition or complication).

7th character

0not applicable or unspecified

Other encounter types for O35.3:

Notes that apply from higher levels

Instructions written at a parent level also apply to O35.3XX0.

› From O35 Maternal care for known or suspected fetal abnormality and damage
Includes
  • the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy
Excludes1
  • encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Code also
  • any associated maternal condition

Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 655.31Suspected damage to fetus from viral disease in the mother, affecting management of mother, delivered, with or without mention of antepartum conditionapproximate
  • 655.33Suspected damage to fetus from viral disease in the mother, affecting management of mother, antepartum condition or complicationapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about O35.3XX0

Is O35.3XX0 billable?

Yes. O35.3XX0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "0" at the end of O35.3XX0 mean?

It is the 7th character for not applicable or unspecified.

Can O35.3XX0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict O35.3XX0 as a principal diagnosis.

Is O35.3XX0 a CC or MCC?

No. O35.3XX0 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does O35.3XX0 group to?

O35.3XX0 is used in the MS-DRG v44.0 logic for MS-DRG 817 (Other Antepartum Diagnoses with O.R. Procedures with MCC), MS-DRG 818 (Other Antepartum Diagnoses with O.R. Procedures with CC), MS-DRG 819 (Other Antepartum Diagnoses with O.R. Procedures without CC/MCC), MS-DRG 831 (Other Antepartum Diagnoses without O.R. Procedures with MCC), MS-DRG 832 (Other Antepartum Diagnoses without O.R. Procedures with CC) and MS-DRG 833 (Other Antepartum Diagnoses without O.R. Procedures without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for O35.3XX0?

The CMS General Equivalence Mappings map O35.3XX0 to ICD-9-CM 655.31 and 655.33.