O99 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium.
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Conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care
Code to identify specific condition
When the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)
Anemia complicating pregnancy, childbirth and the puerperium
Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, childbirth and the puerperium
Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium
Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium
Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
Diseases of the respiratory system complicating pregnancy, childbirth and the puerperium
Diseases of the digestive system complicating pregnancy, childbirth and the puerperium
Diseases of the skin and subcutaneous tissue complicating pregnancy, childbirth and the puerperium
Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium
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