O10.91
⚠ Non-billable (Header)Unspecified pre-existing hypertension complicating pregnancy
Pregnancy, childbirth and the puerperium (O00-O9A)
⚠️ This is a category header code — not billable. Use a more specific child code below.
⚠️ Excludes2
inheritedRules inherited from parent codes.
- • pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-)
Child Codes (4)
Clinical Description
ICD-10-CM code O10.91 represents unspecified pre-existing hypertension complicating pregnancy. This code falls under the Pregnancy, childbirth and the puerperium (O00-O9A) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.
This is a 6-character code at the 5th level of specificity. There are 4 more specific child codes under O10.91.
Frequently Asked Questions
What is ICD-10 code O10.91?
ICD-10-CM code O10.91 is "Unspecified pre-existing hypertension complicating pregnancy". It belongs to the category: Pregnancy, childbirth and the puerperium (O00-O9A).
Is O10.91 a billable ICD-10 code?
No, O10.91 is a non-billable header code. A more specific child code must be used for billing.
Can O10.91 be coded with other codes?
O10.91 has 1 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
Related Codes in O10.9
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)