Brian John Hamway, MD
Internal Medicine Physician · San Francisco, CA
Brian John Hamway, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1437372273, issued on Apr 10, 2007. Check the license (California G88412, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian John Hamway
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- G88412 CA
25MA07710200 NJ
203202 NY
Self-reported in NPPES; status is on the state search - Practice location
- 36 Grattan St, San Francisco, CA 94117
- Phone
- (415) 854-1575
- Enumerated
- Apr 10, 2007
- Record last updated
- Jan 18, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (877) 992-3841
- Medicare enrollment
- Enrolled (PECOS I20221101002158); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Brian John Hamway in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G88412Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average internal medicine physician in 2024
352 Medicare Part D claims for 19 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 24 claims were for opioids.
Most prescribed
- Trazodone Hcl18 claims
- Hydrocodone-Acetaminophen17 claims
- Alprazolam15 claims
- Gabapentin15 claims
- Metformin Hcl15 claims
- Mupirocin14 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: $313.07
3 payments; by number, the most common kind was food and beverage; the largest payer was Dermavant Sciences, 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.
Brian John Hamway among 17,696 internal medicine physician records in California
Brian John Hamway, MD 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1993 · median 2004 among the 11,065 with a school on file
- Record last updated2017 · 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
- Pedro Aceves-Casillas, M.D.San Francisco, CA 941171144252396
- Charles Allison, M.D.San Francisco, CA 941171376541060
- Carl Bricca, D.O.San Francisco, CA 941171114925385
- Robert BrodySan Francisco, CA 941171801815600
- Kwok Chan, M.D.San Francisco, CA 941171063413714
- Diana Hilbert, M.D.San Francisco, CA 941171386642551
- William Kell, M.DSan Francisco, CA 941171528094547
- Kenneth Maybury, M.D.San Francisco, CA 941171295733459
Common questions
What is Brian John Hamway, MD's NPI number?
Brian John Hamway, MD's National Provider Identifier (NPI) is 1437372273, issued on Apr 10, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Brian John Hamway, MD located?
The NPPES record lists a practice address at 36 Grattan St, San Francisco, CA, 94117. Phone: (415) 854-1575. Providers update this record themselves, so call before visiting.
How can I verify Brian John Hamway, MD's license?
NPPES lists California license number G88412, 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 Brian John Hamway, MD prescribe under Medicare Part D?
In 2024, Brian John Hamway, MD had 352 Medicare Part D claims for 19 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.