Allan S. Au, M.D.
Hospitalist Physician · Fairfield, CA
Allan S. Au, M.D. is a hospitalist physician with a practice address in Fairfield, California, and NPI 1427495563, issued on May 30, 2013. Check the license (California A146155, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Allan S. Au
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A146155 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 B Gale Wilson Blvd, Fairfield, CA 94533
- Phone
- (707) 646-5000
- Enumerated
- May 30, 2013
- Record last updated
- Dec 19, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170316000078); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 1200 B Gale Wilson Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Yusuf Ahmad, MDAnesthesiology Physician1104020262
- Tashira AlexanderRegistered Dietitian1902732480
- Nail Amro, M.D.Internal Medicine Physician1861413551
- Erin Berntsen, ACNPAcute Care Nurse Practitioner1205640489
- Neeta BhasinCritical Care Pharmacist1457984882
- Salimah Boghani, M.DInternal Medicine Physician1689711293
Verify Allan S. Au in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A146155Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average hospitalist physician in 2024
236 Medicare Part D claims for 98 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass33 claims
- Doxycycline Monohydrate21 claims
- Pantoprazole Sodium12 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
- 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).
Allan S. Au among 3,099 hospitalist physician records in California
Allan S. Au, M.D. is one of 3,099 hospitalist physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 56% of them.
- NPI issued2013 · 56% of these records are older, 39% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2013 · median 2010 among the 2,505 with a school on file
- Record last updated2016 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Fairfield → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Benjamin Liu, D.O.Fairfield, CA 945331932544061
- Andrea Ngo, MDFairfield, CA 945331699863464
- Satinderjit Nijjar, MDFairfield, CA 945331689171183
- Pranay Bahuguna, M.D.Fairfield, CA 945341174598932
- James Chan, M.D.Antioch, CA 945311033437231
- Anirudh Dwarakanath, MDFairfield, CA 945351154956415
- Jingping Hao, M.D.Antioch, CA 945311710236898
- Ni Mo, D.O.Antioch, CA 945311285175539
Common questions
What is Allan S. Au, M.D.'s NPI number?
Allan S. Au, M.D.'s National Provider Identifier (NPI) is 1427495563, issued on May 30, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Allan S. Au, M.D. located?
The NPPES record lists a practice address at 1200 B Gale Wilson Blvd, Fairfield, CA, 94533. Phone: (707) 646-5000. Providers update this record themselves, so call before visiting.
How can I verify Allan S. Au, M.D.'s license?
NPPES lists California license number A146155, 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 Allan S. Au, M.D. prescribe under Medicare Part D?
In 2024, Allan S. Au, M.D. had 236 Medicare Part D claims for 98 beneficiaries; the average among hospitalist physician prescribers was 521. 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.