Loren Castellon, MD
Obstetrics & Gynecology Physician · Santa Monica, CA
Loren Castellon, MD is an obstetrics & gynecology physician with a practice address in Santa Monica, California, and NPI 1114555612, issued on Mar 30, 2020. Check the license (California A197013, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Loren Castellon
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A197013 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1301 20TH St Ste 270, Santa Monica, CA 90404
- Phone
- (310) 828-8585
- Enumerated
- Mar 30, 2020
- Record last updated
- Sep 25, 2024
- Medicare enrollment
- Enrolled (PECOS I20240823000433); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 2020
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1301 20TH St Ste 270
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mana Baskovic, D.O.Obstetrics & Gynecology Physician1750742698
- Henry Hasserjian, M.D.Obstetrics & Gynecology Physician1598866014
- Paula Josephson Shulman, MD, MPHObstetrics & Gynecology Physician1053572107
- Angela Nishio, M.D.Obstetrics & Gynecology Physician1053320242
- Albert PhillipsObstetrics & Gynecology Physician1568554723
- Kailyn Quash, NPFamily Nurse Practitioner1265310940
Verify Loren Castellon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A197013Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
35 Medicare Part D claims for 21 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol12 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: $29.09
1 payment: food and beverage; the largest payer was Exact Sciences Corporation. 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 Saint Johns Medical FoundationSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Loren Castellon among 5,088 obstetrics & gynecology physician records in California
Loren Castellon, 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 2020, is newer than 94% of them.
- NPI issued2020 · 94% of these records are older, 4% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2020 · median 2004 among the 2,700 with a school on file
- Record last updated2024 · 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 Santa Monica → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Shamsah Amersi, M.D.Santa Monica, CA 904041699743112
- Tristan Bickman, MDSanta Monica, CA 904041245253210
- Yvonne Bohn, M.D.Santa Monica, CA 904041417058587
- Lawrence Bruksch, M.D.Santa Monica, CA 904041073562203
- Richard Frieder, MDSanta Monica, CA 904041457360687
- William Growdon, M.D.Santa Monica, CA 904041427154533
- Zeina Hijazi, M.DSanta Monica, CA 904041518920974
- Karla Iacampo, MDSanta Monica, CA 904041154339083
Common questions
What is Loren Castellon, MD's NPI number?
Loren Castellon, MD's National Provider Identifier (NPI) is 1114555612, issued on Mar 30, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Loren Castellon, MD located?
The NPPES record lists a practice address at 1301 20TH St Ste 270, Santa Monica, CA, 90404. Phone: (310) 828-8585. Providers update this record themselves, so call before visiting.
How can I verify Loren Castellon, MD's license?
NPPES lists California license number A197013, 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 Loren Castellon, MD prescribe under Medicare Part D?
In 2024, Loren Castellon, MD had 35 Medicare Part D claims for 21 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.