O24.31 — Unspecified pre-existing diabetes mellitus in pregnancy
Is O24.31 billable?
No — O24.31 is a non-billable header code. O24.31 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath O24.31.
Billable codes under this header
- O24.311Unspecified pre-existing diabetes mellitus in pregnancy, first trimester
- O24.312Unspecified pre-existing diabetes mellitus in pregnancy, second trimester
- O24.313Unspecified pre-existing diabetes mellitus in pregnancy, third trimester
- O24.319Unspecified pre-existing diabetes mellitus in pregnancy, unspecified trimester
O24.31 at a glance
| Code | O24.31 |
|---|---|
| Description | Unspecified pre-existing diabetes mellitus in pregnancy |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is O24.31 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to O24.31. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Pregnancy › complicated by › diabetes › pre-existing (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O24.31 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- supervision of normal pregnancy (Z34.-)
Use additional code — inherited from Chapter 15
Report an additional code alongside O24.31 to fully describe the condition. O24.31 is sequenced first.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Use additional code — inherited from O24.3
Report an additional code alongside O24.31 to fully describe the condition. O24.31 is sequenced first.
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O24.31, but a patient may have both at the same time. When documentation supports it, O24.31 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O20-O29
The conditions below are not part of O24.31, but a patient may have both at the same time. When documentation supports it, O24.31 and the excluded code may both be reported.
What codes fall under O24.31? (4)
- O24.311Unspecified pre-existing diabetes mellitus in pregnancy, first trimester
- O24.312Unspecified pre-existing diabetes mellitus in pregnancy, second trimester
- O24.313Unspecified pre-existing diabetes mellitus in pregnancy, third trimester
- O24.319Unspecified pre-existing diabetes mellitus in pregnancy, unspecified trimester
How long has O24.31 existed?
O24.31 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.