DR. GREGORY WILLIAM ALEXANDER FRASER MBBCHB
NPI 1891674941
Anesthesiology in San Francisco, CA
About Dr. Gregory William Alexander Fraser Mbbchb NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GREGORY WILLIAM ALEXANDER FRASER MBBCHB (NPI 1891674941) is an individual anesthesiology provider in San Francisco, California, licensed in California (SPI904) and active in the NPI registry since September 2025. He is enrolled in Medicare PECOS and is a graduate of Other (2016).
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
Dr. Gregory William Alexander Fraser Mbbchb 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 Reassignments
3Medicare enrollment records show Gregory Fraser reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 723 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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.
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 94143
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 Gregory Fraser's NPI number?
The NPI number for Gregory Fraser is 1891674941. It was assigned to this individual provider in the NPPES registry on September 1, 2025.
Where is Gregory Fraser located?
Gregory Fraser practices at 521 Parnassus Ave, San Francisco, CA 94143. The listed phone number is (415) 514-1043.
What is Gregory Fraser's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Gregory Fraser enrolled in Medicare?
Yes. Gregory Fraser 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 organizations bill Medicare for Gregory Fraser's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Fraser reassigns Medicare benefits to 3 organizations: University Anesthesia Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (San Francisco, CA). Each 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 Gregory Fraser'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 Gregory Fraser was last updated on September 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months 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.
# Dr. Gregory William Alexander Fraser, MBBCHB · NPI 1891674941
Anesthesiology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since September 1, 2025.
## Identity
- **NPI:** 1891674941 (Entity type: Individual)
- **Enumerated:** September 1, 2025
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** SPI904 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 521 PARNASSUS AVE, San Francisco, CA 94143-2206
- **Phone:** (415) 514-1043
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): University Anesthesia Medical Group (NPI 1528137296, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** September 1, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1891674941) · Data from the CMS NPPES public registry.