O16 ICD-10-CM Code: Unspecified maternal hypertension
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
O16Unspecified maternal hypertension
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where O16 sits
- 1
Chapter 15
Pregnancy, childbirth and the puerperium (O00-O9A)
- 2
Section
Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16)
- 3
Category O16
Unspecified maternal hypertension
- 4
Code O16
Unspecified maternal hypertension
More specific choices
Codes under O16
O16 is a non-billable category. Choose the child code that best matches the documented diagnosis.
O16.1Unspecified maternal hypertension, first trimester
O16.2Unspecified maternal hypertension, second trimester
O16.3Unspecified maternal hypertension, third trimester
O16.4Unspecified maternal hypertension, complicating childbirth
O16.5Unspecified maternal hypertension, complicating the puerperium
O16.9Unspecified maternal hypertension, unspecified trimester
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for O16.
Code first
No “code first” instruction is listed for O16.
Use additional code
No “use additional code” instruction is listed for O16.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for O16.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for O16.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code O16 mean?
O16 is the FY 2027 U.S. ICD-10-CM code for “Unspecified maternal hypertension.”
Is O16 a billable or specific ICD-10-CM code?
No. O16 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is O16 located in ICD-10-CM?
O16 is listed in Chapter 15, Pregnancy, childbirth and the puerperium (O00-O9A), within Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16) (O10–O16), under category O16, Unspecified maternal hypertension.
What coding notes are listed for O16?
No inclusion terms are listed for O16 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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