O16
⚠ Non-billable
Unspecified maternal hypertension
ICD-10-CM · FY2026 · Pregnancy, Childbirth and the Puerperium
Code
O16
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Pregnancy, Childbirth and the Puerperium
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code O16?
ICD-10-CM code O16 represents Unspecified maternal hypertension. It is a non-billable header code requiring a more specific subcategory in the Pregnancy, Childbirth and the Puerperium chapter, effective October 1, 2025 – September 30, 2026.
Is O16 billable?
No. O16 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is O16 in?
O16 belongs to the Pregnancy, Childbirth and the Puerperium chapter (O00–O9A) of ICD-10-CM.
Related codes in the O16 category
O16.1
Unspecified maternal hypertension, first trimester
Billable
O16.2
Unspecified maternal hypertension, second trimester
Billable
O16.3
Unspecified maternal hypertension, third trimester
Billable
O16.4
Unspecified maternal hypertension, complicating childbirth
Billable
O16.5
Unspecified maternal hypertension, complicating the puerperium
Billable
O16.9
Unspecified maternal hypertension, unspecified trimester
Billable
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