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O11 ICD-10-CM Code: Pre-existing hypertension with pre-eclampsia

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Official description

O11

Pre-existing hypertension with pre-eclampsia

ICD-10-CM diagnosis code · United States clinical modification

Where O11 sits

  1. 1

    Chapter 15

    Pregnancy, childbirth and the puerperium (O00-O9A)

  2. 2

    Section

    Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16)

  3. 3

    Category O11

    Pre-existing hypertension with pre-eclampsia

  4. 4

    Code O11

    Pre-existing hypertension with pre-eclampsia

Codes under O11

O11 is a non-billable category. Choose the child code that best matches the documented diagnosis.

O11.1Pre-existing hypertension with pre-eclampsia, first trimesterO11.2Pre-existing hypertension with pre-eclampsia, second trimesterO11.3Pre-existing hypertension with pre-eclampsia, third trimesterO11.4Pre-existing hypertension with pre-eclampsia, complicating childbirthO11.5Pre-existing hypertension with pre-eclampsia, complicating the puerperiumO11.9Pre-existing hypertension with pre-eclampsia, unspecified trimester

Notes for this code

Inclusion terms

No inclusion terms are listed for O11.

Code first

No “code first” instruction is listed for O11.

Use additional code

  • code from O10 to identify the type of hypertension

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for O11.

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for O11.

Source and release

Data release
U.S. ICD-10-CM · FY 2027
Effective date
Oct 1, 2026

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 source

Frequently asked questions

What does ICD-10-CM code O11 mean?

O11 is the FY 2027 U.S. ICD-10-CM code for “Pre-existing hypertension with pre-eclampsia.”

Is O11 a billable or specific ICD-10-CM code?

No. O11 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 O11 located in ICD-10-CM?

O11 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 O11, Pre-existing hypertension with pre-eclampsia.

What coding notes are listed for O11?

No inclusion terms are listed for O11 in this reference record. No code-first instruction is listed. Additional-code instructions: code from O10 to identify the type of hypertension. No Excludes1 note is listed. No Excludes2 note is listed.