O99.412: Diseases of the circulatory system complicating pregnancy, second trimester
O99.412 is the billable ICD-10-CM diagnosis code for Diseases of the circulatory system complicating pregnancy, second trimester. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code O99.412?
O99.412 is the ICD-10-CM diagnosis code for Diseases of the circulatory system complicating pregnancy, second trimester. It belongs to category O99 (Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium).
Is O99.412 a billable code?
Yes. O99.412 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does O99.412 belong to?
O99.412 is part of ICD-10-CM category O99 — Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium, which has 192 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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