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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.

Official description

O16

Unspecified maternal hypertension

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

Where O16 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 O16

    Unspecified maternal hypertension

  4. 4

    Code O16

    Unspecified maternal hypertension

Codes under O16

O16 is a non-billable category. Choose the child code that best matches the documented diagnosis.

O16.1Unspecified maternal hypertension, first trimesterO16.2Unspecified maternal hypertension, second trimesterO16.3Unspecified maternal hypertension, third trimesterO16.4Unspecified maternal hypertension, complicating childbirthO16.5Unspecified maternal hypertension, complicating the puerperiumO16.9Unspecified maternal hypertension, unspecified trimester

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.

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 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.