U.S. ICD-10-CM · FY 2027

O10 ICD-10-CM Code: Pre-existing hypertension complicating pregnancy, childbirth and the puerperium

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

Code definition

Official description

O10

Pre-existing hypertension complicating pregnancy, childbirth and the puerperium

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

Classification

Where O10 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 O10

    Pre-existing hypertension complicating pregnancy, childbirth and the puerperium

  4. 4

    Code O10

    Pre-existing hypertension complicating pregnancy, childbirth and the puerperium

More specific choices

Codes under O10

O10 is a non-billable category. Choose the child code that best matches the documented diagnosis.

O10.0

Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium

O10.1

Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium

O10.2

Pre-existing hypertensive chronic kidney disease complicating pregnancy, childbirth and the puerperium

O10.3

Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, childbirth and the puerperium

O10.4

Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium

O10.9

Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperium

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for O10.

Code first

No “code first” instruction is listed for O10.

Use additional code

No “use additional code” instruction is listed for O10.

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for O10.

Excludes2

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

  • pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-)

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

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

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code O10 mean?

O10 is the FY 2027 U.S. ICD-10-CM code for “Pre-existing hypertension complicating pregnancy, childbirth and the puerperium.”

Is O10 a billable or specific ICD-10-CM code?

No. O10 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 O10 located in ICD-10-CM?

O10 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 O10, Pre-existing hypertension complicating pregnancy, childbirth and the puerperium.

What coding notes are listed for O10?

No inclusion terms are listed for O10 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-).

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