2027 ICD-10-CM Diagnosis Code O12Gestational [pregnancy-induced] edema and proteinuria without hypertension

ICD-10-CM Codes›O00-O9A›O10-O16›O12

ICD-10-CM O12
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O12 is a non-billable ICD-10-CM category code for gestational [pregnancy-induced] edema and proteinuria without hypertension, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O12.00, O12.01, O12.02, and O12.03.

Code Identity

ICD-10-CM Code
O12
Billable Status
No — Non-Billable Category
Code Describes
Gestational [pregnancy-induced] edema and proteinuria without hypertension
Short Description
Gestational edema and proteinuria without hypertension
Chapter
O10-O16
Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO10-O16Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
CategoryO12Gestational [pregnancy-induced] edema and proteinuria without hypertension
This CodeO12Gestational [pregnancy-induced] edema and proteinuria without hypertension

Specific Coding for Gestational edema and proteinuria without hypertensionOverview

Non-specific codes like O12 require more characters. Use one of these billable codes instead:

  • O12.0 for Gestational edema

  • Use O12.00 for Gestational edema, unspecified trimester

  • Use O12.01 for Gestational edema, first trimester

  • Use O12.02 for Gestational edema, second trimester

  • Use O12.03 for Gestational edema, third trimester

  • Use O12.04 for Gestational edema, complicating childbirth

  • Use O12.05 for Gestational edema, complicating the puerperium

  • O12.1 for Gestational proteinuria

  • Use O12.10 for Gestational proteinuria, unspecified trimester

  • Use O12.11 for Gestational proteinuria, first trimester

  • Use O12.12 for Gestational proteinuria, second trimester

  • Use O12.13 for Gestational proteinuria, third trimester

  • Use O12.14 for Gestational proteinuria, complicating childbirth

  • Use O12.15 for Gestational proteinuria, complicating the puerperium

  • O12.2 for Gestational edema with proteinuria

  • Use O12.20 for Gestational edema with proteinuria, unspecified trimester

  • Use O12.21 for Gestational edema with proteinuria, first trimester

  • Use O12.22 for Gestational edema with proteinuria, second trimester

  • Use O12.23 for Gestational edema with proteinuria, third trimester

  • Use O12.24 for Gestational edema with proteinuria, complicating childbirth

  • Use O12.25 for Gestational edema with proteinuria, complicating the puerperium

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O12: its own notes plus those printed at Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Notes

General instructions on how these codes are used.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name O12, its category, or a range that includes it.

Includes 1

These notes mention O12.

  • O15 Eclampsia
    convulsions following conditions in O10-O14 and O16 names O10-O14, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming O12: its condition is not part of those codes, and both may be reported when the patient has both.

  • O99.4 Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
    hypertensive disorders (O10-O16) names O10-O16, which includes this code

Patient EducationClinical

Edema

Edema means swelling caused by fluid in your body's tissues. It usually occurs in the feet, ankles and legs, but it can involve your entire body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O12Overview

Is O12 a billable code?

No. This is a category header that groups the codes for gestational [pregnancy-induced] edema and proteinuria without hypertension, and headers cannot be submitted on claims. Claims for gestational [pregnancy-induced] edema and proteinuria without hypertension need a more specific code from this category, such as O12.00, O12.01, and O12.02.