O24.02 Pre-existing type 1 diabetes mellitus, in childbirth

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applies from O24.0 Pre-existing type 1 diabetes mellitus, in pregnancy, childbirth and the puerperium

Applicable to

• Juvenile onset diabetes mellitus, in pregnancy, childbirth and the puerperium
• Ketosis-prone diabetes mellitus in pregnancy, childbirth and the puerperium

Use additional code

• code from category E10 to further identify any manifestations

MS-DRG index

Defines the logic of DRG(s) 998 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 648.01 Diabetes mellitus of mother, complicating pregnancy, childbirth, or the puerperium, delivered, with or without mention of antepartum condition (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 O24.02

Back-references to O24

• Type 2 Excludes: O99.2 Endocrine, nutritional and metabolic diseases complicating pregnancy, childbirth and the puerperium ("diabetes mellitus (O24.-)")
• Type 1 Excludes: R73 Elevated blood glucose level ("diabetes mellitus in pregnancy, childbirth and the puerperium (O24.-)")

Diagnosis Index entries for O24.02

• Delivery (childbirth) (labor) › complicated › by › diabetes › pre-existing › type 1

Nearby codes

• O24.01 Pre-existing type 1 diabetes mellitus, in pregnancy
• O24.011 Pre-existing type 1 diabetes mellitus, in pregnancy, first trimester
• O24.012 Pre-existing type 1 diabetes mellitus, in pregnancy, second trimester
• O24.013 Pre-existing type 1 diabetes mellitus, in pregnancy, third trimester
• O24.019 Pre-existing type 1 diabetes mellitus, in pregnancy, unspecified trimester
• O24.02 Pre-existing type 1 diabetes mellitus, in childbirth (this code)
• O24.03 Pre-existing type 1 diabetes mellitus, in the puerperium
• O24.1 Pre-existing type 2 diabetes mellitus, in pregnancy, childbirth and the puerperium
• O24.11 Pre-existing type 2 diabetes mellitus, in pregnancy
• O24.111 Pre-existing type 2 diabetes mellitus, in pregnancy, first trimester
• O24.112 Pre-existing type 2 diabetes mellitus, in pregnancy, second trimester