2026 ICD-10-CM Diagnosis Code O15.1Eclampsia complicating labor

ICD-10-CM Codes›O00-O9A›O10-O16›O15

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

O15.1 is a billable ICD-10-CM diagnosis code for eclampsia complicating labor. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as eclampsia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complications specified during childbirth and Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium.

Code Identity

ICD-10-CM Code
O15.1
Billable Status
Yes — Valid for Submission
Code Describes
Eclampsia complicating labor
Short Description
Eclampsia complicating labor
Same as the full description in the CMS dataset.
Parent Code
O15
Eclampsia

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO10-O16Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
CategoryO15Eclampsia
This CodeO15.1Eclampsia complicating labor

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O15.1.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Eclampsia
  • Eclampsia added to pre-existing hypertension
  • Eclampsia in labor
  • Eclampsia with pre-existing hypertension in childbirth

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Delivery(childbirth) (labor)
      • complicated
        • by
          • eclampsia
    • Eclampsia, eclamptic(coma) (convulsions) (delirium) (with hypertension) NEC
      • complicating
        • labor and delivery

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PRG023
Complications specified during childbirth
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG020
Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium
Default principal diagnosis: inpatient Yes · outpatient Yes

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

Childbirth Problems

Childbirth is the process of giving birth to a baby. It includes labor and delivery. Usually everything goes well, but problems can happen. They may cause a risk to the mother, baby, or both. Some of the more common childbirth problems include:

Read the full article at MedlinePlus

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

Convert O15.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
642.61 Eclampsia-delivered
Approximate The match is approximate rather than exact.

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 O15.1Overview

Is O15.1 (Eclampsia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report eclampsia complicating labor on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O15.1 group to?

When eclampsia complicating labor is the principal diagnosis on an inpatient stay, it groups to MS-DRG 817, 818, 819, 831, 832, 833, with relative weights from 0.5229 to 1.6880 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can O15.1 be reported for?

The Medicare Code Editor checks eclampsia complicating labor against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of O15.1?

Under the General Equivalence Mappings, eclampsia complicating labor converts to ICD-9-CM 642.61 (eclampsia-delivered). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.