Billable / Specific Code
ICD-10-CM O16.1 is the diagnosis code for Unspecified maternal hypertension, first trimester. This code falls under the section "Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium" 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 O16.1 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, O16.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
O16.1 is the ICD-10-CM diagnosis code for "Unspecified maternal hypertension, first trimester". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of O16.1 is O16 ("Unspecified maternal hypertension"). O16.1 provides a more specific classification within this category.
O16.1 is located in Section O10-O16 — "Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium" within Chapter 15 of the ICD-10-CM Tabular List.
Use O16.1 when the patients documented diagnosis matches "Unspecified maternal hypertension, 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 Unspecified maternal hypertension, first trimester is O16.1.
Yes, O16.1 can be used as a primary diagnosis code since it is billable and specific.
O16.1 is in Chapter 15 of the ICD-10-CM Tabular List.
Yes, O16.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.