MR. MICHAEL WAGNER BROOK MD
NPI 1255361838
Anesthesiology in San Francisco, CA
About Mr. Michael Wagner Brook Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. MICHAEL WAGNER BROOK MD (NPI 1255361838) is an individual anesthesiology provider in San Francisco, California, licensed in California (G63429) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Hanford, and is a graduate of Other (1987).
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Other Identifiers 1
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
Mr. Michael Wagner Brook 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 Reassignments
8Medicare enrollment records show Michael Brook reassigns Medicare billing to 8 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
Santa Rosa, CA 95404
- Reassigned Medicare billing, California enrollment
- 140 clinicians in this Medicare group
Modesto, CA 95355
- Reassigned Medicare billing, California enrollment
- 4 clinicians in this Medicare group
Bakersfield, CA 93301
- Reassigned Medicare billing, California enrollment
- 124 clinicians in this Medicare group
Alexandria, VA 22306
- Reassigned Medicare billing, District of Columbia and Virginia enrollments
- 634 clinicians in this Medicare group
- Reassigned Medicare billing, California enrollment
- 420 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 5
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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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
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 Michael Brook's NPI number?
The NPI number for Michael Brook is 1255361838. It was assigned to this individual provider in the NPPES registry on July 3, 2006.
Where is Michael Brook located?
Michael Brook practices at 521 Parnassus Ave Fl 4, San Francisco, CA 94143. The listed phone number is (415) 476-9035.
What is Michael Brook's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Michael Brook enrolled in Medicare?
Yes. Michael Brook 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 Michael Brook's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Brook reassigns Medicare benefits to 8 organizations: University Anesthesia Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA), Anesthesia & Analgesia Medical Group, Inc. (Santa Rosa, CA), Central Valley Pain Management And Wellness Clinic (Modesto, CA) and 3 more organizations, listed in the Medicare section above. 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 Michael Brook'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 Brook was last updated on June 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Mr. Michael Wagner Brook, MD · NPI 1255361838
Anesthesiology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since July 3, 2006.
## Identity
- **NPI:** 1255361838 (Entity type: Individual)
- **Enumerated:** July 3, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** G63429 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 521 PARNASSUS AVE FL 4, San Francisco, CA 94143-2206
- **Phone:** (415) 476-9035
## 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:** 8 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); Anesthesia & Analgesia Medical Group, Inc. (NPI 1659320984, Santa Rosa, CA); Central Valley Pain Management And Wellness Clinic (NPI 1871657403, Modesto, CA); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1987
## Record status
- **NPPES last updated:** June 3, 2025
- **Other identifiers:** Medicaid GR0042170 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1255361838) · Data from the CMS NPPES public registry.