2026 ICD-10-CM Diagnosis Code O15Eclampsia

ICD-10-CM Codes›O00-O9A›O10-O16›O15

ICD-10-CM O15
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O15 is a non-billable ICD-10-CM category code for eclampsia, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O15.00, O15.02, O15.03, and O15.1.

Code Identity

ICD-10-CM Code
O15
Billable Status
No — Non-Billable Category
Code Describes
Eclampsia
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
CategoryO15Eclampsia
This CodeO15Eclampsia

Specific Coding for EclampsiaOverview

Non-specific codes like O15 require more characters. Use one of these billable codes instead:

  • O15.0 for Eclampsia complicating pregnancy

  • Use O15.00 for Eclampsia complicating pregnancy, unspecified trimester

  • Use O15.02 for Eclampsia complicating pregnancy, second trimester

  • Use O15.03 for Eclampsia complicating pregnancy, third trimester

  • Use O15.1 for Eclampsia complicating labor

  • Use O15.2 for Eclampsia complicating the puerperium

  • Use O15.9 for Eclampsia, unspecified as to time period

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • convulsions following conditions in O10 O14 O16

Clinical InformationClinical

  • Eclampsia

    onset of hyperreflexia; seizures; or coma in a previously diagnosed pre-eclamptic patient (pre-eclampsia).

  • Pre-Eclampsia

    a complication of pregnancy, characterized by a complex of symptoms including maternal hypertension and proteinuria with or without pathological edema. symptoms may range between mild and severe. pre-eclampsia usually occurs after the 20th week of gestation, but may develop before this time in the presence of trophoblastic disease.

  • Chronic Maternal Hypertension with Superimposed Preeclampsia|Pre-existing hypertension with pre-eclampsia, unspecified trimester

    chronic hypertension in association with preeclampsia.

  • Eclampsia

    a potentially life-threatening pregnancy-related disorder characterized by tonic-clonic seizures in association with hypertension after the twentieth week of gestation and up to six weeks postpartum and in the absence of other potential causes of seizures.

  • GAIA Insufficient Evidence for Diagnosis of Preeclampsia with Severe Features|Global Alignment of Immunization safety Assessment in pregnancy Insufficient Evidence for Diagnosis of Preeclampsia with Severe Features|Insufficient Evidence for Preeclampsia with Severe Features

    gaia insufficient evidence for diagnosis of preeclampsia with severe features is a pregnancy with a gestational age greater than or equal to 20 weeks and the inability to measure blood pressure.

  • GAIA Insufficient Evidence for Diagnosis of Preeclampsia|Global Alignment of Immunization safety Assessment in pregnancy Insufficient Evidence for Diagnosis of Preeclampsia|Insufficient Evidence for Preeclampsia

    gaia insufficient evidence for diagnosis of preeclampsia is defined as a pregnancy with gestational age greater than or equal to 20 weeks and either a) the inability to measure blood pressure or b) the inability to evaluate for proteinuria.

  • GAIA Level 1 Preeclampsia with Severe Features|Global Alignment of Immunization safety Assessment in pregnancy Level 1 Preeclampsia with Severe Features|Level 1 Preeclampsia with Severe Features

    gaia level 1 preeclampsia with severe features is defined by three criteria: first, the gestational age of the pregnancy must be greater than or equal to 20 weeks; second, a diagnosis of new onset maternal hypertension (systolic blood pressure greater than or equal to 140mmhg and/or diastolic blood pressure greater than or equal to 90mmhg) that is sustained on two measurements over a minimum of one hour); third, the presence of one or more of the following requirements: a) systolic blood pressure greater than or equal to 160mmhg and/or diastolic blood pressure greater than or equal to 110mmhg, which is confirmed after only minutes; b) development of severe, persistent headache; c) development of visual changes; d) eclampsia; e) new onset thrombocytopenia (platelets less than 100,000/microliter); f) new onset unremitting epigastric pain; g) ast and alt elevated to twice the upper limit of normal; h) evidence of liver capsular hematoma or liver rupture (diagnosed on clinical exam or with imaging); i) worsening renal function, as evidenced by serum creatinine level greater than 1.1 mg/dl, a doubling of the serum creatinine (absent other renal disease), or oliguria (less than 500 cc/24 hours); j) pulmonary edema (confirmed on either imaging with chest x-ray or on clinical exam).

  • GAIA Level 1 Preeclampsia|Global Alignment of Immunization safety Assessment in pregnancy Level 1 Preeclampsia|Level 1 Preeclampsia

    gaia level 1 preeclampsia is defined by three criteria: first, the gestational age of the pregnancy must be greater than or equal to 20 weeks; second, a diagnosis of new onset maternal hypertension (systolic blood pressure greater than or equal to 140mmhg and/or diastolic blood pressure greater than or equal to 90mmhg) that is sustained on two measurements over a minimum of one hour; third, a diagnosis of new onset proteinuria that is a level one diagnostic certainty (proteinuria diagnosed with greater than or equal to 300 mg of protein during 24 hour urine collection or greater than or equal to 0.3 for spot protein:creatinine ratio.)

  • GAIA Level 2 Preeclampsia with Severe Features|Global Alignment of Immunization safety Assessment in pregnancy Level 2 Preeclampsia with Severe Features|Level 2 Preeclampsia with Severe Features

    gaia level 2 preeclampsia with severe features is defined by three criteria: first, the gestational age of the pregnancy must be greater than or equal to 20 weeks; second, a diagnosis of new onset maternal hypertension (systolic blood pressure greater than or equal to 140mmhg and/or diastolic blood pressure greater than or equal to 90mmhg) that is sustained on two measurements for a minimum of one hour; third, the diagnosis of new onset nausea and vomiting.

  • GAIA Level 2 Preeclampsia|Global Alignment of Immunization safety Assessment in pregnancy Level 2 Preeclampsia|Level 2 Preeclampsia

    gaia level 2 preeclampsia is defined by three criteria: first, the gestational age of the pregnancy must be greater than or equal to 20 weeks; second, a diagnosis of new onset maternal hypertension (systolic blood pressure greater than or equal to 140mmhg and/or diastolic blood pressure greater than or equal to 90mmhg) that is sustained on two measurements for a minimum of one hour; third, a diagnosis of new onset proteinuria that is a level 2 diagnostic certainty (proteinuria diagnosed with greater than or equal to 1+ protein on urine dipstick).

  • GAIA Preeclampsia Level of Diagnostic Certainty Terminology|Global Alignment of Immunization safety Assessment in pregnancy Preeclampsia Level of Diagnostic Certainty Terminology

    a subset of terminology related to preeclampsia, developed by the global alignment of immunization safety assessment in pregnancy consortium to aid in monitoring and improving fetal and maternal outcomes.

  • GAIA Preeclampsia Level of Diagnostic Certainty|Global Alignment of Immunization safety Assessment in pregnancy Preeclampsia Level of Diagnostic Certainty|Preeclampsia Level of Diagnostic Certainty

    a classification of maternal and fetal outcomes relating to preeclampsia, developed by the global alignment of immunization safety assessment in pregnancy, based on the extent to which the diagnosis has been confirmed.

  • Preeclampsia

    a systolic blood pressure of 140 mmhg or higher, or a diastolic blood pressure of 90 mmhg or higher on two occasions at least 4 hours apart (or greater than or equal to 160/110 mmhg within a short interval) after 20 weeks of gestation in a woman with previously normal blood pressure. it may present with proteinuria but if not, it may be associated with thrombocytopenia, impaired liver function, progressive renal insufficiency, pulmonary edema, or new-onset cerebral or visual disturbances.

  • Pre-Existing Hypertension with Pre-Eclampsia, Complicating Childbirth|Pre-existing hypertension with pre-eclampsia, complicating childbirth

    evidence of pre-existing hypertension with pre-eclampsia, complicating childbirth.

  • Pre-Existing Hypertension with Pre-Eclampsia, Complicating the Puerperium|Pre-existing hypertension with pre-eclampsia, complicating the puerperium

    evidence of pre-existing hypertension with pre-eclampsia, complicating the puerperium.

  • Pre-Existing Hypertension with Pre-Eclampsia, First Trimester|Pre-existing hypertension with pre-eclampsia, first trimester

    evidence of pre-existing hypertension with pre-eclampsia in the first trimester.

  • Pre-Existing Hypertension with Pre-Eclampsia, Second Trimester|Pre-existing hypertension with pre-eclampsia, second trimester

    evidence of pre-existing hypertension with pre-eclampsia in the second trimester.

  • Pre-Existing Hypertension with Pre-Eclampsia, Third Trimester|Pre-existing hypertension with pre-eclampsia, third trimester

    evidence of pre-existing hypertension with pre-eclampsia in the third trimester.

  • Severe Preeclampsia|Preeclampsia with Severe Features|Preeclampsia with Severe Features

    preeclampsia with a systolic blood pressure of 160 mmhg or higher, or a diastolic blood pressure of 110 mmhg or higher on two occasions at least 4 hours apart while on bedrest. it is associated with thrombocytopenia (platelets less than 100,000 per microliter), impaired liver function (twice normal elevation of hepatic transaminases; severe, persistent right upper quadrant or epigastric pain), progressive renal insufficiency (serum creatinine greater than 1.1 mg/dl or doubling of baseline in the absence of other renal disease), pulmonary edema, or new-onset cerebral or visual disturbances.

Patient EducationClinical

High Blood Pressure in Pregnancy

Blood pressure is the force of your blood pushing against the walls of your arteries. Your arteries are blood vessels that carry blood from your heart to other parts of your body. High blood pressure, or hypertension, is blood pressure that is higher than normal.

The full article covers:

  • What is high blood pressure in pregnancy?
  • What are the types of high blood pressure in pregnancy?
  • Who is more likely to develop high blood pressure in pregnancy?
  • What are the symptoms of high blood pressure in pregnancy?
  • What problems can high blood pressure in pregnancy cause?
  • How is high blood pressure in pregnancy diagnosed?
  • What are the treatments for high blood pressure in pregnancy?

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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O15Overview

Is O15 (Eclampsia) a billable code?

No. This is a category header that groups the codes for eclampsia, and headers cannot be submitted on claims. Claims for eclampsia need a more specific code from this category, such as O15.00, O15.02, and O15.03.