O98.811 Other maternal infectious and parasitic diseases complicating pregnancy, first trimester

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from O98 Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

Includes

• the listed conditions when complicating the pregnant state, when aggravated by the pregnancy, or as a reason for obstetric care

Excludes2 (not included here)

• 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)

Use additional code

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

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 647.81 Other specified infectious and parasitic diseases of mother, delivered, with or without mention of antepartum condition (approximate)
• 647.83 Other specified infectious and parasitic diseases of mother, antepartum condition or complication (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Nearby codes

• O98.719 Human immunodeficiency virus [HIV] disease complicating pregnancy, unspecified trimester
• O98.72 Human immunodeficiency virus [HIV] disease complicating childbirth
• O98.73 Human immunodeficiency virus [HIV] disease complicating the puerperium
• O98.8 Other maternal infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium
• O98.81 Other maternal infectious and parasitic diseases complicating pregnancy
• O98.811 Other maternal infectious and parasitic diseases complicating pregnancy, first trimester (this code)
• O98.812 Other maternal infectious and parasitic diseases complicating pregnancy, second trimester
• O98.813 Other maternal infectious and parasitic diseases complicating pregnancy, third trimester
• O98.819 Other maternal infectious and parasitic diseases complicating pregnancy, unspecified trimester
• O98.82 Other maternal infectious and parasitic diseases complicating childbirth
• O98.83 Other maternal infectious and parasitic diseases complicating the puerperium