O24.311 – Unspecified pre-existing diabetes mellitus in pregnancy, first trimester

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

Billable code

ICD-10-CM code O24.311

Code: O24.311 (claims format: O24311)
Description: Unspecified pre-existing diabetes mellitus in pregnancy, first trimester
Short description: Unsp pre-existing diabetes in pregnancy, first trimester
Billable: Yes – valid for HIPAA-covered transactions
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 › O24.3 › O24.31

Notes inherited from parent codes

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

O24.3 – Unspecified pre-existing diabetes mellitus in pregnancy, childbirth and the puerperium

Use additional code:

code (for):
from category E11 to further identify any manifestation
injectable non-insulin antidiabetic drugs (Z79.85)
long-term (current) use of insulin (Z79.4)

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)

Related codes in O24.31

Frequently asked questions

What is ICD-10 code O24.311?

O24.311 is the ICD-10-CM code for unspecified pre-existing diabetes mellitus in pregnancy, first trimester, in the block O20-O29 (Other maternal disorders predominantly related to pregnancy).

Is O24.311 a billable code?

Yes. O24.311 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does O24.311 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.