O24.01 – Pre-existing type 1 diabetes mellitus, in pregnancy

ICD-10-CM 2027 diagnosis code · Other maternal disorders predominantly related to pregnancy

Non-billable header

ICD-10-CM code O24.01

Code: O24.01 (claims format: O2401)
Description: Pre-existing type 1 diabetes mellitus, in pregnancy
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: O20-O29 Other maternal disorders predominantly related to pregnancy
Parent codes: O24 › O24.0

Billable codes under O24.01

O24.01 is a header code and cannot be used on claims. Choose the most specific code:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

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

Block O20-O29

Excludes2 (not included here):

maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)

Index terms for O24.01

Entries in the ICD-10-CM alphabetic index that lead to this code:

Pregnancy, complicated by, diabetes, pre-existing, type 1

Related codes in O24.0

Frequently asked questions

What is ICD-10 code O24.01?

O24.01 is the ICD-10-CM code for pre-existing type 1 diabetes mellitus, in pregnancy, in the block O20-O29 (Other maternal disorders predominantly related to pregnancy).

Is O24.01 a billable code?

No. O24.01 is a header code with more specific child codes; report one of the billable codes listed above.

What category does O24.01 belong to?

It belongs to category O24 – Diabetes mellitus in pregnancy, childbirth, and the puerperium.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.