Henry H. Hamilton, M.D.
Obstetrics & Gynecology Physician · San Mateo, CA
Henry H. Hamilton, M.D. is an obstetrics & gynecology physician with a practice address in San Mateo, California, and NPI 1417927534, issued on Jan 23, 2006. Check the license (California A36569, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Henry H. Hamilton
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- A36569 CA
A39569 CA
Self-reported in NPPES; status is on the state search - Practice location
- 136 N San Mateo Dr Ste 101, San Mateo, CA 94401
- Phone
- (650) 375-1800
- Enumerated
- Jan 23, 2006
- Record last updated
- May 19, 2025
- Fax
- (650) 375-8269
- Medicaid ID
- 00A395690 CA
- Medicare enrollment
- Enrolled (PECOS I20101012000517); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 136 N San Mateo Dr Ste 101
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sandra Beretta, MDObstetrics & Gynecology Physician1568573889
- Melissa Duncanson, MDObstetrics & Gynecology Physician1144753443
- Alexandra Flessel, MDObstetrics & Gynecology Physician1003493701
Verify Henry H. Hamilton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A36569Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
283 Medicare Part D claims for 81 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Amlodipine Besylate23 claims
- Atorvastatin Calcium20 claims
- Cefdinir17 claims
- Estradiol14 claims
- Nebivolol Hcl14 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: $356.37
20 payments; by number, the most common kind was food and beverage; the largest payer was Mayne Pharma Commercial LLC. The 21,429 providers of this specialty with any payment received $1,030.61 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 one group practice
- Ucsf Health Medical FoundationRedwood City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Henry H. Hamilton among 5,088 obstetrics & gynecology physician records in California
Henry H. Hamilton, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% 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, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1975 · median 2004 among the 2,700 with a school on file
- Record last updated2025 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in San Mateo → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Shelley Adams, MDSan Mateo, CA 944011891801932
- Maryam Arjomand, M.D.San Mateo, CA 944011689763781
- Sandra Beretta, MDSan Mateo, CA 944011568573889
- Beatrice Burke, MDSan Mateo, CA 944011033298625
- Melissa Duncanson, MDSan Mateo, CA 944011144753443
- Alexandra Flessel, MDSan Mateo, CA 944011003493701
- Elizabeth Murphy, MDSan Mateo, CA 944011942311261
- Susan Spencer, MDSan Mateo, CA 944011477664795
Common questions
What is Henry H. Hamilton, M.D.'s NPI number?
Henry H. Hamilton, M.D.'s National Provider Identifier (NPI) is 1417927534, issued on Jan 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Henry H. Hamilton, M.D. located?
The NPPES record lists a practice address at 136 N San Mateo Dr Ste 101, San Mateo, CA, 94401. Phone: (650) 375-1800. Providers update this record themselves, so call before visiting.
How can I verify Henry H. Hamilton, M.D.'s license?
NPPES lists California license number A36569, 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 Henry H. Hamilton, M.D. prescribe under Medicare Part D?
In 2024, Henry H. Hamilton, M.D. had 283 Medicare Part D claims for 81 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.