Clifford Quan, MD
Infectious Disease Physician · Antioch, CA
Clifford Quan, MD is an infectious disease physician with a practice address in Antioch, California, and NPI 1235322264, issued on Aug 22, 2007. Check the license (California A94084, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Clifford Quan
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- A94084 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4501 Sand Creek RD, Antioch, CA 94531
- Phone
- (925) 295-4612
- Enumerated
- Aug 22, 2007
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (925) 813-3144
- Medicare enrollment
- Enrolled (PECOS I20091121000109); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 4501 Sand Creek RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Triveni Abburi, M.D.Internal Medicine Physician1710267497
- Janel AfanadorPharmacist1356655880
- Rosilda AlvesClinical Psychologist1174670327
- Arnoldo Amador, RCPGeneral Care Registered Respiratory Therapist1487118436
- Veronica Arellano, RDRegistered Dietitian1740091354
- Lloyd Asuncion, MDInternal Medicine Physician1437353034
Verify Clifford Quan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A94084Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6.0 times the Medicare Part D claims of the average infectious disease physician in 2024
4,117 Medicare Part D claims for 1,606 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 44% of claims.
Most prescribed
- Azithromycin1,131 claims
- Atovaquone-Proguanil Hcl452 claims
- Typhim Vi370 claims
- Havrix362 claims
- Boostrix Tdap257 claims
- Twinrix182 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
- Permanente Medical Group IncAntioch, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clifford Quan among 1,119 infectious disease physician records in California
Clifford Quan, MD is one of 1,119 infectious disease physician records with a practice address in California. 79% 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 46% of them.
- NPI issued2007 · 46% of these records are older, 41% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2004 · median 2003 among the 735 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 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Antioch → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Mark Ellis, MDFairfield, CA 945331144317462
- Justin Graham, MDFairfield, CA 945331386751477
- Scott Crabtree, MDTravis Afb, CA 945351932360526
- Mark Derasmo, MDTravis Afb, CA 945351023647419
- Brian Hogan, M.D.Travis Afb, CA 945351689635120
- Peter Matthews, MDTravis Afb, CA 945351487758694
- Marquise Westbrook, MDTravis Afb, CA 945351437718756
- Muni Barash, M.D.Fremont, CA 945381962428896
Common questions
What is Clifford Quan, MD's NPI number?
Clifford Quan, MD's National Provider Identifier (NPI) is 1235322264, issued on Aug 22, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Clifford Quan, MD located?
The NPPES record lists a practice address at 4501 Sand Creek RD, Antioch, CA, 94531. Phone: (925) 295-4612. Providers update this record themselves, so call before visiting.
How can I verify Clifford Quan, MD's license?
NPPES lists California license number A94084, 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 Clifford Quan, MD prescribe under Medicare Part D?
In 2024, Clifford Quan, MD had 4,117 Medicare Part D claims for 1,606 beneficiaries; the average among infectious disease physician prescribers was 689. 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.