Justin P. Quock, M.D., F.A.C.P.
Internal Medicine Physician · San Francisco, CA
Justin P. Quock, M.D., F.A.C.P. is an internal medicine physician with a practice address in San Francisco, California, and NPI 1699792663, issued on Jul 16, 2006. Check the license (California A55916, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Justin P. Quock
- Credential
- M.D., F.A.C.P.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A55916 CA
Self-reported in NPPES; status is on the state search - Practice location
- 929 Clay St, San Francisco, CA 94108
- Phone
- (415) 398-5100
- Enumerated
- Jul 16, 2006
- Record last updated
- Sep 3, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (415) 837-1408
- Medicaid ID
- 00A55916000 CA
- Medicare enrollment
- Enrolled (PECOS I20101117000823); accepts Medicare assignment
- Medical or professional school
- R Franklin University Of Med & Sci/Chicago Medical School, 1990
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 929 Clay St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Wenwu Jin, M.D., PH.D.Urology Physician1003051780
Verify Justin P. Quock in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A55916Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% more Medicare Part D claims than the average internal medicine physician in 2024
3,979 Medicare Part D claims for 377 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 19 claims were for opioids.
Most prescribed
- Atorvastatin Calcium278 claims
- Losartan Potassium227 claims
- Amlodipine Besylate214 claims
- Metformin Hcl144 claims
- Anastrozole102 claims
- Hydroxyurea97 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.
Industry payments in 2024: $137.20
2 payments; by number, the most common kind was food and beverage; the largest payer was Eisai Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Chinese Hospital AssociationDaly City, CA
- North East Medical ServicesSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Justin P. Quock among 17,696 internal medicine physician records in California
Justin P. Quock, M.D., F.A.C.P. is one of 17,696 internal medicine 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1990 · median 2004 among the 11,065 with a school on file
- Record last updated2019 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,318 internal medicine physician records list a practice address in San Francisco
They are 1,318 of the 38,143 NPPES records with a practice address in San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mai-Sie Chan, MDSan Francisco, CA 941081326136557
- Shu Wing Chan, MDSan Francisco, CA 941081497828586
- Gustin Ho, M.D.San Francisco, CA 941081437189966
- Jerome Jew, M.D.San Francisco, CA 941081235143702
- Chuk Kwan, M.D.San Francisco, CA 941081336101500
- Lisa Law, M.D.San Francisco, CA 941081518030543
- Kerri Masutto, M.D.San Francisco, CA 941081780913442
- Raphael Stricker, M.D.San Francisco, CA 941081417028044
Common questions
What is Justin P. Quock, M.D., F.A.C.P.'s NPI number?
Justin P. Quock, M.D., F.A.C.P.'s National Provider Identifier (NPI) is 1699792663, issued on Jul 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Justin P. Quock, M.D., F.A.C.P. located?
The NPPES record lists a practice address at 929 Clay St, San Francisco, CA, 94108. Phone: (415) 398-5100. Providers update this record themselves, so call before visiting.
How can I verify Justin P. Quock, M.D., F.A.C.P.'s license?
NPPES lists California license number A55916, 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 Justin P. Quock, M.D., F.A.C.P. prescribe under Medicare Part D?
In 2024, Justin P. Quock, M.D., F.A.C.P. had 3,979 Medicare Part D claims for 377 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.