Eclampsia (O15) ICD-10-CM
The O15 code range covers eclampsia with 8 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
Codes in the O15 Range 8 codes · 6 billable
- O15 EclampsiaNon-billable
- O15.0 Eclampsia complicating pregnancyNon-billable
- O15.00 Eclampsia complicating pregnancy, unspecified trimester
- O15.02 Eclampsia complicating pregnancy, second trimester
- O15.03 Eclampsia complicating pregnancy, third trimester
- O15.1 Eclampsia complicating labor
- O15.2 Eclampsia complicating the puerperium
- O15.9 Eclampsia, unspecified as to time period
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O15 range.
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.
About the O15 Code Range
ICD-10 code O15 and its subcodes classify various stages and timing of eclampsia, a serious pregnancy-related condition involving seizures. These codes are essential for documenting eclampsia whether it occurs during pregnancy, labor, or the postpartum period.
Eclampsia, sometimes referred to as eclamptic seizure or puerperal convulsion, is captured across the ICD-10 codes in section O15. For example, O15.00 codes for eclampsia during pregnancy when the trimester is unspecified, while O15.02 and O15.03 specify the second and third trimesters respectively. When eclampsia occurs during labor or childbirth, coders use O15.1, which also covers cases involving pre-existing hypertension. Similarly, O15.2 is designated for eclampsia complications in the puerperium, the postpartum phase. The general code O15.9 applies when the timing of eclampsia onset is not specified. These detailed distinctions help medical coders assign the correct ICD-10 code for precise reporting, billing, and epidemiological tracking of hypertensive disorders complicating pregnancy.
Questions About This Page
How many billable codes are in the O15 range?
Of the 8 codes in this range, 6 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the O15 range classify?
The range classifies eclampsia. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
