Billable / Specific Code
ICD-10-CM O24.312 is the diagnosis code for Unspecified pre-existing diabetes mellitus in pregnancy, second trimester. This code falls under the section "Other maternal disorders predominantly related to pregnancy" within Chapter 15 — Pregnancy, childbirth and the puerperium (O00-O9A). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where O24.312 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, O24.312 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
O24.312 is the ICD-10-CM diagnosis code for "Unspecified pre-existing diabetes mellitus in pregnancy, second trimester". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of O24.312 is O24.31 ("Unspecified pre-existing diabetes mellitus in pregnancy"). O24.312 provides a more specific classification within this category.
O24.312 is located in Section O20-O29 — "Other maternal disorders predominantly related to pregnancy" within Chapter 15 of the ICD-10-CM Tabular List.
Use O24.312 when the patients documented diagnosis matches "Unspecified pre-existing diabetes mellitus in pregnancy, second trimester" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Unspecified pre-existing diabetes mellitus in pregnancy, second trimester is O24.312.
Yes, O24.312 can be used as a primary diagnosis code since it is billable and specific.
O24.312 is in Chapter 15 of the ICD-10-CM Tabular List.
Yes, O24.312 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.