Calvin Chou, MD,PHD
NPI 1669407565 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Calvin Chou, MD,PHD is a Internal Medicine Physician provider in San Francisco, CA (NPI 1669407565).
Provider details
- NPI number
- 1669407565
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD,PHD
- Sex
- Male
- Sole proprietor
- No
- License
- A060002 (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
19 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-11
- Last updated
- 2007-07-08
Frequently asked questions
- What is Calvin Chou's NPI number?
- Calvin Chou's National Provider Identifier (NPI) is 1669407565, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Calvin Chou's specialty?
- Calvin Chou is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Calvin Chou located?
- Calvin Chou's practice location on file with NPPES is 4150 Clement St # 111, San Francisco, CA 94121-1545.
- What is Calvin Chou's phone number?
- The practice phone number listed in the NPPES registry for Calvin Chou is (415) 221-4810.
- Does Calvin Chou accept Medicare?
- Calvin Chou is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Calvin Chou's NPI active?
- Yes — Calvin Chou's NPI (1669407565) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.