O16
Non-billableUnspecified maternal hypertension
Unspecified maternal hypertension
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
Use Additional Code
Additional codes that should follow this code
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Child Codes (6)
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, comp the puerperium
O16.9Unspecified maternal hypertension, unspecified trimester
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(2)
Frequently Asked Questions
What is the ICD-10 code for unspecified maternal hypertension?
The ICD-10-CM code for unspecified maternal hypertension is O16. The full clinical description is "Unspecified maternal hypertension". O16 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code O16 mean?
ICD-10-CM code O16 represents “Unspecified maternal hypertension”. It is classified under Chapter 15: Pregnancy, Childbirth and the Puerperium and is a non-billable header code. Use a more specific child code for billing purposes.
Is O16 a billable code?
No, O16 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 6 child codes under O16.
What chapter is O16 in?
O16 is in Chapter 15: Pregnancy, Childbirth and the Puerperium (codes O00-O9A).
What codes cannot be used with O16?
O16 has Excludes1 notes indicating codes that cannot be used together with it, including: supervision of normal pregnancy (Z34.-).
What are the subcategories under O16?
O16 has 6 child codes, including: 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), and 2 more.
Are additional codes required with O16?
Yes, when using O16, also report: code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known..
What are the UMLS CUIs for O16?
O16 is linked to 1 UMLS Concept Unique Identifier: C0495183. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does O16 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like unspecified maternal hypertension affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of O16?
O16 maps to the ICD-11 code: JA2Z (Oedema, proteinuria, or hypertensive disorders in pregnancy, childbirth, or the puerperium, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.