Carl William Rex
Student in an Organized Health Care Education/Training Program · San Francisco, CA
Carl William Rex is a student in an organized health care education/training program with a practice address in San Francisco, California, and NPI 1366944258, issued on Mar 6, 2018. Check the license with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Carl William Rex
- Primary taxonomy
- Student in an Organized Health Care Education/Training Program 390200000X
- Practice location
- 4150 Clement St Bldg 200, San Francisco, CA 94121
- Phone
- (415) 221-4810
- Enumerated
- Mar 6, 2018
- Record last updated
- Mar 6, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (415) 750-6603
- Entity
- Type 1 · individual
8 nearest student in an organized health care education/training program records → All 40,652 in California → Look up another NPI →
Also registered at 4150 Clement St Bldg 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Tiffany YuenStudent in an Organized Health Care Education/Training Program1376357293
Verify Carl William Rex in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average student in an organized health care education/training program in 2024
13 Medicare Part D claims for 12 beneficiaries, against an average of 185 among the 59,748 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Carl William Rex among 40,652 student in an organized health care education/training program records in California
Carl William Rex is one of 40,652 student in an organized health care education/training program records with a practice address in California. 16% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 17% of them.
- NPI issued2018 · 17% of these records are older, 80% newer
- In a Medicare fileYes · 16% of these records are
- In the CMS Doctors and Clinicians fileNo · 6% of these records are
- Record last updated2018 · 26% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 390200000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3,035 student in an organized health care education/training program records list a practice address in San Francisco
They are 3,035 of the 38,143 NPPES records with a practice address in San Francisco, and 40,652 student in an organized health care education/training program records in California.
All 40,652 in California → Every provider in San Francisco → Student in an Organized Health Care Education/Training Program nationwide →
The 8 student in an organized health care education/training program records with the nearest ZIP codes
- Carlesia AzinheiraSan Francisco, CA 941211568698249
- Madelyn ChattonSan Francisco, CA 941211063663797
- Naomi ChauSan Francisco, CA 941211538376280
- Hiu Man Christine ChiuSan Francisco, CA 941211255560991
- Sanket Dhruva, M.D.San Francisco, CA 941211801024963
- Ayeh Ghadiri, DMDSan Francisco, CA 941211447487848
- Malin KimotoSan Francisco, CA 941211972754497
- Ethel La GuardiaSan Francisco, CA 941211174762439
Common questions
What is Carl William Rex's NPI number?
Carl William Rex's National Provider Identifier (NPI) is 1366944258, issued on Mar 6, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Carl William Rex located?
The NPPES record lists a practice address at 4150 Clement St Bldg 200, San Francisco, CA, 94121. Phone: (415) 221-4810. Providers update this record themselves, so call before visiting.
How can I verify Carl William Rex's license?
Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Carl William Rex prescribe under Medicare Part D?
In 2024, Carl William Rex had 13 Medicare Part D claims for 12 beneficiaries; the average among student in an organized health care education/training program prescribers was 185. 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.