MICHAEL MAIN MD
NPI 1649833005
Internal Medicine - Allergy & Immunology in San Francisco, CA
About Michael Main Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MICHAEL MAIN MD (NPI 1649833005) is an individual allergy & immunology provider in San Francisco, California, licensed in California (A178576) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS and is a graduate of New York University School Of Medicine (2019).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Michael Main Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Michael Main reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 82 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94114 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN FRANCISCO, CA 94114
SAN FRANCISCO, CA 94114
SAN FRANCISCO, CA 94114
SAN FRANCISCO, CA 94114
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Michael Main's NPI number?
The NPI number for Michael Main is 1649833005. It was assigned to this individual provider in the NPPES registry on April 20, 2019.
Where is Michael Main located?
Michael Main practices at 45 Castro St, San Francisco, CA 94114. The listed phone number is (702) 882-5285.
What is Michael Main's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Allergy & Immunology, with taxonomy code 207RA0201X.
Is Michael Main enrolled in Medicare?
Yes. Michael Main is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Michael Main's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Main reassigns Medicare benefits to Regents Of The University Of California - Ucsf (San Francisco, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Michael Main's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Michael Main was last updated on October 13, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Michael Main, MD · NPI 1649833005
Allergy & Immunology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since April 20, 2019.
## Identity
- **NPI:** 1649833005 (Entity type: Individual)
- **Enumerated:** April 20, 2019
- **Primary specialty:** Internal Medicine - Allergy & Immunology · taxonomy 207RA0201X
- **State license:** A178576 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 45 CASTRO ST, San Francisco, CA 94114-1010
- **Phone:** (702) 882-5285
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Regents Of The University Of California - Ucsf (NPI 1265890263, San Francisco, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York University School Of Medicine, class of 2019
## Record status
- **NPPES last updated:** October 13, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1649833005) · Data from the CMS NPPES public registry.