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ICD-10-CM 2027 diagnosis code

O98Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

Not billable — use a more specific code

O98 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.Short description: Matern infec/parastc dis classd elsw but compl preg/chldbrth

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About O98

O98 is the ICD-10-CM diagnosis code for maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium. It belongs to block O94-O9A (other obstetric conditions, not elsewhere classified) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: O98.0 (puerperium), O98.1 (puerperium), O98.2 (puerperium), O98.3 (puerperium), O98.4 (puerperium), O98.5 (puerperium), O98.6 (puerperium), O98.7 (puerperium) and 2 more.

The conditions in its Excludes2 note aren't part of O98, but may be coded alongside it if the patient has both: herpes gestationis (O26.4-), infectious carrier state (O99.82-, O99.83-), obstetrical tetanus (A34), puerperal infection (O86.-) and 2 more.

Use an additional code (Chapter 1), to identify specific infectious or parasitic disease.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under O98

Coding notes

IncludesFurther defines 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
Excludes2Not included here — may be reported together if both conditions exist
  • 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 codeAdd a secondary code to fully describe the condition
  • code (Chapter 1), to identify specific infectious or parasitic disease

Notes that apply from higher levels

Instructions written at a parent level also apply to O98.

Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.

Codes whose notes reference O98

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about O98

Is O98 billable?

No. O98 is a header code. Report one of its more specific subcodes instead.