Maternal care for other known or suspected poor fetal growth, unspecified trimester, not applicable or unspecified

O36.5990 (“Maternal care for other known or suspected poor fetal growth, unspecified trimester, not applicable or unspecified”) is a diagnosis code that identifies a specific condition, injury, or finding on a medical claim in the ICD-10-CM code set. Whether it is billed — and whether a payer covers it — depends on the clinical setting, documentation, and plan rules.