O98

Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

FY2027Chapter 15: Pregnancy, childbirth and the puerperium/O94–O9A Other obstetric conditions, not elsewhere classified

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

Use additional code
Excludes1
Excludes2

O98 is a non-billable ICD-10-CM code category for maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium. 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 O98.0 Tuberculosis complicating pregnancy, childbirth and the puerperium; O98.1 Syphilis complicating pregnancy, childbirth and the puerperium; O98.2 Gonorrhea complicating pregnancy, childbirth and the puerperium; O98.3 Other infections with a predominantly sexual mode of transmission complicating pregnancy, childbirth and the puerperium and 6 more. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 10 Excludes2 entries.

Guidelines tip

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.

Guidelines I.C.15.a.3; I.C.15.a.5Pregnancy: the trimester characterRead the official text

Use additional code

Add the listed code as a secondary code, if known.

This code

code (Chapter 1), to identify specific infectious or parasitic disease

Also from chapter/block level (1 note)

Inherited from Chapter 15 Pregnancy, childbirth and the puerperium

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.

Also from chapter/block level (1 note)

Inherited from Chapter 15 Pregnancy, childbirth and the puerperium

supervision of normal pregnancy (Z34.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code

herpes gestationis (O26.4-)
infectious carrier state (O99.82-, O99.83-)
obstetrical tetanus (A34)
puerperal infection (O86.-)
puerperal sepsis (O85)
when the reason for maternal care is that the disease is known or suspected to have affected the fetus (O35-O36)

Also from chapter/block level (4 notes)

Inherited from Chapter 15 Pregnancy, childbirth and the puerperium

mental and behavioral disorders associated with the puerperium (F53.-)
obstetrical tetanus (A34)
postpartum necrosis of pituitary gland (E23.0)
puerperal osteomalacia (M83.0)

Includes

Further defines or gives examples of the content of the category.

This code

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)

Inherited from Chapter 15 Pregnancy, childbirth and the puerperium

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

More specific codes under O98 10