John Thomas Ludlow, M.D.
Emergency Medicine Physician · Merced, CA
John Thomas Ludlow, M.D. is an emergency medicine physician with a practice address in Merced, California, and NPI 1154615391, issued on Jun 6, 2011. Check the license (California A122427, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Thomas Ludlow
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A122427 CA
Self-reported in NPPES; status is on the state search - Practice location
- 333 Mercy Ave, Merced, CA 95340
- Phone
- (209) 564-5000
- Enumerated
- Jun 6, 2011
- Record last updated
- Dec 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 333 Mercy Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Calbeth Alaribe, PA-CMedical Physician Assistant1891377081
- Itzel Angulo, MDStudent in an Organized Health Care Education/Training Program1538962147
- Jason Antunez, M.D.Emergency Medicine Physician1578852877
- Jaswinder Barn, DNP/FNP/PMHNPFamily Nurse Practitioner1306331699
- Ma Lovely Batasin, DOEmergency Medicine Physician1023579000
- Ashley Brauchler, PA-CPhysician Assistant1578301396
Verify John Thomas Ludlow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A122427Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average emergency medicine physician in 2024
33 Medicare Part D claims for 18 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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.
John Thomas Ludlow among 7,751 emergency medicine physician records in California
John Thomas Ludlow, 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 2011, is newer than 60% of them.
- NPI issued2011 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2021 · 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 Merced → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Jason Antunez, M.D.Merced, CA 953401578852877
- Stephen Backman, D.O.Merced, CA 953401144250721
- Ma Lovely Batasin, DOMerced, CA 953401023579000
- Yorai Benzeevi, MDMerced, CA 953401760428577
- Laura Fletcher, M.D.Merced, CA 953401275562597
- James HardyMerced, CA 953401144332560
- Fatoumata Lelenta, M.D.Merced, CA 953401619269974
- Steven Maron, M.D.Merced, CA 953401821026063
Common questions
What is John Thomas Ludlow, M.D.'s NPI number?
John Thomas Ludlow, M.D.'s National Provider Identifier (NPI) is 1154615391, issued on Jun 6, 2011. An NPI identifies a provider in billing; it is not a license.
Where is John Thomas Ludlow, M.D. located?
The NPPES record lists a practice address at 333 Mercy Ave, Merced, CA, 95340. Phone: (209) 564-5000. Providers update this record themselves, so call before visiting.
How can I verify John Thomas Ludlow, M.D.'s license?
NPPES lists California license number A122427, 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 John Thomas Ludlow, M.D. prescribe under Medicare Part D?
In 2024, John Thomas Ludlow, M.D. had 33 Medicare Part D claims for 18 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.