O98.519
Other viral diseases complicating pregnancy, unspecified trimester
O98.519 (also written O98519) is a billable ICD-10-CM diagnosis code for other viral diseases complicating pregnancy, unspecified trimester. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 60 codes in category O98 (Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium). Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 10 Excludes2 entries.
Guidelines tips
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The trimester character comes from the provider's documentation for the current encounter. The unspecified trimester code should rarely be used.
When COVID-19 is the reason for the encounter, O98.5- is first and U07.1 is additional. Chapter 15 codes always take sequencing priority.
Use additional code
Add the listed code as a secondary code, if known.
- code (Chapter 1), to identify specific infectious or parasitic disease
Also from chapter/block level (1 note)
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium (O98.7-)
Also from chapter/block level (1 note)
- supervision of normal pregnancy (Z34.-)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (4 notes)
Includes
Further defines or gives examples of the content of the category.
- the listed conditions when complicating the pregnant state, when aggravated by the pregnancy, or as a reason for obstetric care
Notes
Also from chapter/block level (6 notes)
- 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