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ICD-10-CM 2027 diagnosis code

O99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

Not billable — use a more specific code

O99 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.Short description: Oth maternal diseases classd elsw but compl preg/chldbrth

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O99

O99 is the ICD-10-CM diagnosis code for other maternal 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 9 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: O99.0 (puerperium), O99.1 (puerperium), O99.2 (puerperium), O99.3 (puerperium), O99.4 (puerperium), O99.5 (puerperium), O99.6 (puerperium), O99.7 (puerperium) and 1 more.

The conditions in its Excludes2 note aren't part of O99, but may be coded alongside it if the patient has both: when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36).

Use an additional code to identify specific condition.

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 O99

Coding notes

IncludesFurther defines the content of the category
  • conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care
Excludes2Not included here — may be reported together if both conditions exist
  • when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)
Use additional codeAdd a secondary code to fully describe the condition
  • code to identify specific condition

Notes that apply from higher levels

Instructions written at a parent level also apply to O99.

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

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 O99

Is O99 billable?

No. O99 is a header code. Report one of its more specific subcodes instead.