O99.5 Diseases of the respiratory system complicating pregnancy, childbirth and the puerperium

ICD-10-CM Code O99.5: Diseases of the respiratory system complicating pregnancy, childbirth and the puerperium

ICD-10-CM code O99.5 represents diseases of the respiratory system complicating pregnancy, childbirth and the puerperium. It is an active diagnosis concept nested under parent code O99 for other maternal diseases classifiable elsewhere but complicating pregnancy. The terminology record lists no narrower child concepts for this specific code. 1 6

Plain-language overview

Code O99.5 identifies respiratory system diseases complicating pregnancy, childbirth and the puerperium, and a separate phecode resource lists expanded descriptions including diseases complicating specific pregnancy trimesters. 1 5

What this code represents

The official display label for O99.5 is diseases of the respiratory system complicating pregnancy, childbirth and the puerperium, and its designated semantic type is disease or syndrome. 1

Within the ICD-10-CM hierarchy, O99.5 is a direct child of the parent concept O99, which covers other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium. 1

Coding details

The 2026 ICD-10-CM terminology record for O99.5 indicates an active status and explicitly lists no narrower descendant concepts under this specific code. 1

Official coding guidelines state that obstetric patients admitted for COVID-19 receive a principal diagnosis code of O98.5- followed by code U07.1 and appropriate manifestation codes. 4

Documentation considerations

A phecode mapping resource lists expanded textual descriptions for O99.5, including diseases of the respiratory system complicating pregnancy during the first, second, and third trimesters. 5

What the sources add

The National Cancer Institute terminology record provides the exact code definition and hierarchical structure, while a separate phecode mapping resource lists expanded clinical descriptions for pregnancy trimesters. 1 5

Official coding guidelines identify a Chapter 15 for pregnancy, childbirth, and the puerperium, and a separate Chapter 10 for diseases of the respiratory system. 3

Coverage and utilization context

The national transition to ICD-10-CM involves substantial changes in United States administrative systems, and O99.5 appears within a phecode mapping resource alongside related digestive and nervous system complications. 2 5

Sources

1. ICD-10-CM O99.5 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. International classification of diseases, 10th edition, clinical modification and procedure coding system: descriptive overview of the next generation HIPAA code sets — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. 2024 April 1-ICD-10-CM Guidelines — cms.gov; accessed 2026-07-27.
4. COVID-19 Guidelines — cdc.gov; accessed 2026-07-27.
5. Phecode 646 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-27.
6. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.