O98.51
Other viral diseases complicating pregnancy
O98.51 is a non-billable ICD-10-CM code header for other viral diseases complicating pregnancy. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are O98.511 Other viral diseases complicating pregnancy, first trimester; O98.512 Other viral diseases complicating pregnancy, second trimester; O98.513 Other viral diseases complicating pregnancy, third trimester and O98.519 Other viral diseases complicating pregnancy, unspecified trimester. 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
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 2 entries
More specific codes under O98.51 4
- O98.511Other viral diseases complicating pregnancy, first trimesterBillable
- O98.512Other viral diseases complicating pregnancy, second trimesterBillable
- O98.513Other viral diseases complicating pregnancy, third trimesterBillable
- O98.519Other viral diseases complicating pregnancy, unspecified trimesterBillable