Cristina Hernandez O'Day, MD
NPI 1275738940ActiveIndividual· Obstetrics & Gynecology· Anaheim, CA
Obstetrics & Gynecology (MD) in Anaheim, California, trained at University of California, Irvine, California College of Medicine (class of 2007). Their prescriptions cost Medicare Part D more than their services did: $8,512 for 71 claims, against $3,510 paid for services in 2024. Mayne Pharma Commercial LLC was the largest of 2 companies reporting payments in 2025, $337.76 in all, mostly food and beverage.
Overview
| NPI | 1275738940 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jun 20, 2007 |
| Last updated in NPPES | Nov 9, 2021 |
| Certified by provider | Nov 9, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology Primary | 207V00000X | A105959 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Obstetrics/Gynecology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 29 |
|---|---|
| Services billed | 50 across 11 procedure codes |
| Paid by Medicare | $3,510 |
Part D prescriptions in 2024
| Prescriptions (claims) | 71 · 120 30-day fills |
|---|---|
| Patients | 34 |
| Total drug cost | $8,512 |
| Generic share | 66% of claims |
Education and affiliations
| Medical school | University of California, Irvine, California College of Medicine |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | Obstetrics/Gynecology |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Industry payments (Open Payments)
- 2025$337.76 · 5 payments from 2 companies
- 2024$113.01 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Mayne Pharma Commercial LLC | $305.48 | 4 |
| Hologic Sales and Service, LLC | $32.28 | 1 |
What the 2025 payments were for
- Food and Beverage$337.76 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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