Unspecified maternal hypertension (O16) ICD-10-CM
The O16 code range covers unspecified maternal hypertension with 7 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the O16 Range 7 codes · 6 billable
- O16 Unspecified maternal hypertensionNon-billable
- O16.1 Unspecified maternal hypertension, first trimester
- O16.2 Unspecified maternal hypertension, second trimester
- O16.3 Unspecified maternal hypertension, third trimester
- O16.4 Unspecified maternal hypertension, complicating childbirth
- O16.5 Unspecified maternal hypertension, complicating the puerperium
- O16.9 Unspecified maternal hypertension, unspecified trimester
About the O16 Code Range
The ICD-10 code O16 and its subcodes represent various types of unspecified maternal hypertension occurring during pregnancy, childbirth, and the postpartum period. These codes are used when a pregnant individual has high blood pressure without a more specific diagnosis.
The section covers unspecified high blood pressure during different stages: O16.1 for the first trimester, O16.2 for the second trimester, and O16.3 for the third trimester. It also includes codes for hypertension complicating childbirth (O16.4) and the puerperium, the period after childbirth (O16.5). The general code O16.9 applies when the trimester or specific timing is unspecified. Terms like “hypertension complicating pregnancy, childbirth and the puerperium” and “chronic hypertension in obstetric context” are synonymous with these codes. These ICD-10 codes help accurately document maternal hypertension without further detail, ensuring proper care and monitoring during pregnancy-related healthcare encounters. This understanding assists medical coders in selecting the correct ICD-10 code for maternal hypertension when precise details are unavailable.
Questions About This Page
How many billable codes are in the O16 range?
Of the 7 codes in this range, 6 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the O16 range classify?
The range classifies unspecified maternal hypertension. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
