O98
Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 11 never code together
O98code
Excludes2
- herpes gestationis (O26.4-)O26.4-O26.4-O26.4-
- infectious carrier state (O99.82-, O99.83-)O99.82-O99.82-O99.82-O99.83-O99.83-O99.83-
- obstetrical tetanus (A34)A34A34A34
- puerperal infection (O86.-)O86.-O86.-O86.-
- puerperal sepsis (O85)O85O85O85
- when the reason for maternal care is that the disease is known or suspected to have affected the fetus (O35-O36)O35-O36O35-O36O35-O36
O00-O9Achapter
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 9
O98code
Includes
- the listed conditions when complicating the pregnant state, when aggravated by the pregnancy, or as a reason for obstetric care
Use additional code
- code (Chapter 1), to identify specific infectious or parasitic disease
O00-O9Achapter
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
Use additional code
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.Z3A
Index entries leading here filed at null
No alphabetic index entry points at this code.
Subordinate codes 10
O98.0 Tuberculosis compl preg/chldbrth O98.1 Syphilis compl preg/chldbrth O98.2 Gonorrhea compl preg/chldbrth O98.3 Oth infections w sexl mode of transmiss compl preg/chldbrth O98.4 Viral hepatitis compl preg/chldbrth O98.5 Oth viral diseases compl preg/chldbrth O98.6 Protozoal diseases compl preg/chldbrth O98.7 Human immunodeficiency virus disease compl preg/chldbrth O98.8 Oth maternal infec/parastc diseases compl preg/chldbrth O98.9 Unsp maternal infec/parastc disease compl preg/chldbrth
Medications 1
MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.