O15.00 Eclampsia complicating pregnancy, unspecified trimester

Billable ICD-10-CM code, FY2026.

Applies from O15 Eclampsia

Includes

• convulsions following conditions in O10-O14 and O16

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 642.60 Eclampsia, unspecified as to episode of care or not applicable (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O15.00

Back-references to O15.00

• Code First: I67.841 Reversible cerebrovascular vasoconstriction syndrome ("underlying condition, if applicable, such as eclampsia (O15.00-O15.9)")

Back-references to O15

• Type 1 Excludes: I10 Essential (primary) hypertension ("hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)")
• Use Additional: I16.1 Hypertensive emergency ("eclampsia (O15.-)")
• Type 2 Excludes: O99.4 Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium ("hypertensive disorders (O10-O16)")

Nearby codes

• O15 Eclampsia
• O15.0 Eclampsia complicating pregnancy
• O15.00 Eclampsia complicating pregnancy, unspecified trimester (this code)
• 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