Clifford Quan, MD
NPI 1235322264 · Infectious Disease Physician · Antioch, CA
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clifford Quan, MD is a Infectious Disease Physician provider in Antioch, CA (NPI 1235322264).
Provider details
- NPI number
- 1235322264
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A94084 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 39 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azithromycin | 1,131 | 1,100 |
| Atovaquone/Proguanil Hclbrand: Atovaquone-Proguanil Hcl | 452 | 443 |
| Typhoid Vi Polysacch Vaccinebrand: Typhim Vi | 370 | 370 |
| Hepatitis a Virus Vaccine/Pfbrand: Havrix | 362 | 295 |
| Diphth,pertuss(acell),tet Vacbrand: Boostrix Tdap | 257 | 257 |
| Hepatitis a and B Vaccine/Pfbrand: Twinrix | 182 | 105 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-08-22
- Last updated
- 2021-12-13
Frequently asked questions
- What is Clifford Quan's NPI number?
- Clifford Quan's National Provider Identifier (NPI) is 1235322264, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clifford Quan's specialty?
- Clifford Quan is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Clifford Quan located?
- Clifford Quan's practice location on file with NPPES is 4501 Sand Creek Rd, Antioch, CA 94531-8687.
- What is Clifford Quan's phone number?
- The practice phone number listed in the NPPES registry for Clifford Quan is (925) 295-4612.
- Does Clifford Quan accept Medicare?
- Clifford Quan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clifford Quan's NPI active?
- Yes — Clifford Quan's NPI (1235322264) is active in the NPPES registry as of the last update on 2021-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.