Cristina Hernandez O'Day, MD
Obstetrics & Gynecology Physician · Anaheim, CA
Cristina Hernandez O'Day, MD is an obstetrics & gynecology physician with a practice address in Anaheim, California, and NPI 1275738940, issued on Jun 20, 2007. Check the license (California A105959, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cristina Hernandez O'Day
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A105959 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1211 W LA Palma Ave, Anaheim, CA 92801
- Phone
- (714) 535-7245
- Enumerated
- Jun 20, 2007
- Record last updated
- Nov 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (714) 535-1955
- Medicare enrollment
- Enrolled (PECOS I20121012000039); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2007
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1211 W LA Palma Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marcelino Arenas, PA-CFamily Medicine Physician1184622862
- Michael Blum, D.D.S.Oral and Maxillofacial Surgery (Dentist)1003976994
- Regina Cuenca, D.O.Hospitalist Physician1598863540
- Clyde Dos Santos, M.D.Pulmonary Disease Physician1528166774
- Mohammad Farukhi, M.D.Hospitalist Physician1578791661
- William Foley, M.D.Specialist1700856598
Verify Cristina Hernandez O'Day in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A105959Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
71 Medicare Part D claims for 34 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims.
Most prescribed
- Estradiol26 claims
- Slynd12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $32.59
2 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cristina Hernandez O'Day among 5,088 obstetrics & gynecology physician records in California
Cristina Hernandez O'Day, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 38% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2007 · median 2004 among the 2,700 with a school on file
- Record last updated2021 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Anaheim → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Rosa Bribiesca, NP NURSE PRACTITIONEAnaheim, CA 928011871679613
- Julie Henriksen, MDAnaheim, CA 928011104850676
- Jane Hong, MDAnaheim, CA 928011013933225
- Helen Luong, MDAnaheim, CA 928011104842319
- Yuna Medina, MDAnaheim, CA 928011225087570
- John Yee, MDAnaheim, CA 928011477629038
- Justin Chuang, MDAnaheim, CA 928021811065691
- Morgan Mandigo, MDAnaheim, CA 928021316334600
Common questions
What is Cristina Hernandez O'Day, MD's NPI number?
Cristina Hernandez O'Day, MD's National Provider Identifier (NPI) is 1275738940, issued on Jun 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Cristina Hernandez O'Day, MD located?
The NPPES record lists a practice address at 1211 W LA Palma Ave, Anaheim, CA, 92801. Phone: (714) 535-7245. Providers update this record themselves, so call before visiting.
How can I verify Cristina Hernandez O'Day, MD's license?
NPPES lists California license number A105959, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cristina Hernandez O'Day, MD prescribe under Medicare Part D?
In 2024, Cristina Hernandez O'Day, MD had 71 Medicare Part D claims for 34 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.