Billable / Specific Code
ICD-10-CM O99.351 is the diagnosis code for Diseases of the nervous system complicating pregnancy, first trimester. This code falls under the section "Other obstetric conditions, not elsewhere classified" within Chapter 15 — Pregnancy, childbirth and the puerperium (O00-O9A). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where O99.351 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, O99.351 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
O99.351 is the ICD-10-CM diagnosis code for "Diseases of the nervous system complicating pregnancy, first trimester". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of O99.351 is O99.35 ("Diseases of the nervous system complicating pregnancy, childbirth, and the puerperium"). O99.351 provides a more specific classification within this category.
O99.351 is located in Section O94-O9A — "Other obstetric conditions, not elsewhere classified" within Chapter 15 of the ICD-10-CM Tabular List.
Use O99.351 when the patients documented diagnosis matches "Diseases of the nervous system complicating pregnancy, first trimester" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Diseases of the nervous system complicating pregnancy, first trimester is O99.351.
Yes, O99.351 can be used as a primary diagnosis code since it is billable and specific.
O99.351 is in Chapter 15 of the ICD-10-CM Tabular List.
Yes, O99.351 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.