Oscar F. Casillas, M.D.
Emergency Medicine Physician · Santa Monica, CA
Oscar F. Casillas, M.D. is an emergency medicine physician with a practice address in Santa Monica, California, and NPI 1902930399, issued on Mar 15, 2007. Check the license (California A93263, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Oscar F. Casillas
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A93263 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1250 16TH St, Santa Monica, CA 90404
- Phone
- (424) 259-8405
- Enumerated
- Mar 15, 2007
- Record last updated
- Jun 26, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070807000356); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1250 16TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Melanie Altamirano-CariagaNurse Practitioner1588060198
- Miguel Arellano, NPNurse Practitioner1295460806
- Jason Bahk, M.D.Hospitalist Physician1245573187
- Christopher BelfourEmergency Medicine Physician1518259837
- Umesh Bhagia, MDSurgery Physician1568468528
- Cassandra Blaylock, NPHematology & Oncology Physician1588043400
Verify Oscar F. Casillas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A93263Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% more Medicare Part D claims than the average emergency medicine physician in 2024
248 Medicare Part D claims for 122 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 19 claims were for opioids.
Most prescribed
- Prednisone21 claims
- Famotidine17 claims
- Hydrocodone-Acetaminophen17 claims
- Ondansetron Odt17 claims
- Cephalexin16 claims
- Albuterol Sulfate Hfa14 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.
Bills Medicare through one group practice
- Capital Hospitalist Medical Group IncLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Oscar F. Casillas among 7,751 emergency medicine physician records in California
Oscar F. Casillas, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% 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 40% of them.
- NPI issued2007 · 40% of these records are older, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2004 · median 2011 among the 4,560 with a school on file
- Record last updated2015 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Santa Monica → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Isaac Bash, MDSanta Monica, CA 904041619934643
- Victor Candioty, MDSanta Monica, CA 904041437116472
- Michelle Charfen, M.D.Santa Monica, CA 904041588602486
- Edward Cotner, MDSanta Monica, CA 904041023074044
- Patricia Drum-Lal, PACSanta Monica, CA 904041639136674
- Walid Ghurabi, D.O.Santa Monica, CA 904041073566931
- Daniel Grossman, MDSanta Monica, CA 904041386601326
- Amy Kijner, PASanta Monica, CA 904041235197849
Common questions
What is Oscar F. Casillas, M.D.'s NPI number?
Oscar F. Casillas, M.D.'s National Provider Identifier (NPI) is 1902930399, issued on Mar 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Oscar F. Casillas, M.D. located?
The NPPES record lists a practice address at 1250 16TH St, Santa Monica, CA, 90404. Phone: (424) 259-8405. Providers update this record themselves, so call before visiting.
How can I verify Oscar F. Casillas, M.D.'s license?
NPPES lists California license number A93263, 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 Oscar F. Casillas, M.D. prescribe under Medicare Part D?
In 2024, Oscar F. Casillas, M.D. had 248 Medicare Part D claims for 122 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.