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 2027, 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O16 range.
Maternal Hypotension
A symptomatic decrease in baseline systolic or diastolic blood pressure in a pregnant woman that requires intervention.
About the O16 Code Range
Maternal hypertension means high blood pressure during pregnancy, childbirth, or the period after childbirth. O16 identifies it as unspecified maternal hypertension.
The pregnancy subdivisions distinguish the first trimester (O16.1), second trimester (O16.2), and third trimester (O16.3). O16.9 identifies an unspecified trimester. Separate subdivisions identify hypertension complicating childbirth (O16.4) and the period after childbirth, called the puerperium (O16.5).
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, 2026 through September 30, 2027. 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 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
