Michael Main, MD
Allergy & Immunology (Internal Medicine) Physician · San Francisco, CA
Michael Main, MD is an allergy & immunology (internal medicine) physician with a practice address in San Francisco, California, and NPI 1649833005, issued on Apr 20, 2019. Check the license (California A178576, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Main
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology (Internal Medicine) Physician 207RA0201X
- License number
- A178576 CA
Self-reported in NPPES; status is on the state search - Practice location
- 45 Castro St, San Francisco, CA 94114
- Phone
- (702) 882-5285
- Enumerated
- Apr 20, 2019
- Record last updated
- Oct 13, 2024
- Medicare enrollment
- Enrolled (PECOS I20240924004438); accepts Medicare assignment
- Medical or professional school
- New York University School Of Medicine, 2019
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest allergy & immunology (internal medicine) physician records → All 81 in California → Look up another NPI →
Also registered at 45 Castro St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Michael Main in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A178576Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average allergy & immunology (internal medicine) physician in 2024
49 Medicare Part D claims for 28 beneficiaries, against an average of 789 among the 429 providers of this specialty who prescribed in Part D. Brand-name drugs were 33% 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.
Industry payments in 2024: $205.28
7 payments; by number, the most common kind was food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 321 providers of this specialty with any payment received $7,456.30 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
- Regents OF The University OF California - UcsfSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Main among 81 allergy & immunology (internal medicine) physician records in California
Michael Main, MD is one of 81 allergy & immunology (internal medicine) physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 89% of them.
- NPI issued2019 · 89% of these records are older, 6% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2019 · median 2010 among the 46 with a school on file
- Record last updated2024 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RA0201X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology (Internal Medicine) Physician providers in California
There are 81 allergy & immunology (internal medicine) physician records in California.
All 81 in California → Every provider in San Francisco → Allergy & Immunology (Internal Medicine) Physician nationwide →
The 8 allergy & immunology (internal medicine) physician records with the nearest ZIP codes
- Von Nguyen, MDSan Francisco, CA 941151174815815
- Lynn Spitler, MDSan Francisco, CA 941171588867535
- Sowmya Arja, M.D.San Francisco, CA 941081215390166
- Roger Wang, D.O.San Francisco, CA 941081164522165
- Anna LangSan Francisco, CA 941431235556432
- Rose MonahanSan Francisco, CA 941431518461268
- Iris Otani, M.D.San Francisco, CA 941431285925990
- Michele Pham, M.D.San Francisco, CA 941431194169300
Common questions
What is Michael Main, MD's NPI number?
Michael Main, MD's National Provider Identifier (NPI) is 1649833005, issued on Apr 20, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Michael Main, MD located?
The NPPES record lists a practice address at 45 Castro St, San Francisco, CA, 94114. Phone: (702) 882-5285. Providers update this record themselves, so call before visiting.
How can I verify Michael Main, MD's license?
NPPES lists California license number A178576, 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 Michael Main, MD prescribe under Medicare Part D?
In 2024, Michael Main, MD had 49 Medicare Part D claims for 28 beneficiaries; the average among allergy & immunology (internal medicine) physician prescribers was 789. 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.