O99.351
BillableDiseases of the nervous system complicating pregnancy, first trimester
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A pregnant woman has a disease affecting the nervous system (such as epilepsy, migraines, or multiple sclerosis) during the first three months of pregnancy.
Coding Tips
- •Always pair with the specific nervous system condition code for complete documentation
- •The fifth character '1' indicates first trimester; verify trimester timing from clinical documentation
Code Hierarchy
└O99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium└O99.3Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium└O99.35Diseases of the nervous system complicating pregnancy, childbirth, and the puerperium└O99.351Diseases of the nervous system complicating pregnancy, first trimester
└O99.351Diseases of the nervous system complicating pregnancy, first trimester