May Tun, M.D.
Emergency Medicine Physician · Fairfield, CA
May Tun, M.D. is an emergency medicine physician with a practice address in Fairfield, California, and NPI 1851787717, issued on Apr 7, 2015. Check the license (California A154392, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- May Tun
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A154392 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4500 Business Center Dr, Fairfield, CA 94534
- Phone
- (707) 646-5000
- Enumerated
- Apr 7, 2015
- Record last updated
- Dec 17, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20180816000264); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 2015
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 4500 Business Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Douglas Dado, DNPFamily Nurse Practitioner1649733049
Verify May Tun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A154392Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2% more Medicare Part D claims than the average emergency medicine physician in 2024
231 Medicare Part D claims for 147 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 20 claims were for opioids.
Most prescribed
- Naproxen22 claims
- Azithromycin16 claims
- Cephalexin15 claims
- Hydrocodone-Acetaminophen13 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 2 group practices
- Northbay Health Medical FoundationAmerican Canyon, CA
- Northbay Physicians Surgery Center, LLCFairfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
May Tun among 7,751 emergency medicine physician records in California
May Tun, 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 2015, is newer than 72% of them.
- NPI issued2015 · 72% of these records are older, 25% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2015 · median 2011 among the 4,560 with a school on file
- 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 Fairfield → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Douglas Alfar, M.D.Travis Afb, CA 945351114986692
- Andrew Beckmann, D.O.Travis Afb, CA 945351972684249
- Teresa Bonzani, MDTravis Afb, CA 945351194713925
- Sarah BriggsFairfield, CA 945331205585304
- Peter Chen, MDTravis Afb, CA 945351558510248
- Mindy DuongFairfield, CA 945331720582604
- John Dutton, M.D.Travis Afb, CA 945351285600346
- Lamarr EcholsFairfield, CA 945331770970139
Common questions
What is May Tun, M.D.'s NPI number?
May Tun, M.D.'s National Provider Identifier (NPI) is 1851787717, issued on Apr 7, 2015. An NPI identifies a provider in billing; it is not a license.
Where is May Tun, M.D. located?
The NPPES record lists a practice address at 4500 Business Center Dr, Fairfield, CA, 94534. Phone: (707) 646-5000. Providers update this record themselves, so call before visiting.
How can I verify May Tun, M.D.'s license?
NPPES lists California license number A154392, 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 May Tun, M.D. prescribe under Medicare Part D?
In 2024, May Tun, M.D. had 231 Medicare Part D claims for 147 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.