DR. MAXIM LEE RITZENBERG M.D.
NPI 1669748158
Emergency Medicine in San Francisco, CA
About Dr. Maxim Lee Ritzenberg M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MAXIM LEE RITZENBERG M.D. (NPI 1669748158) is an individual emergency medicine provider in San Francisco, California, licensed in California (128625) and active in the NPI registry since March 2012. He is enrolled in Medicare PECOS and is a graduate of Columbia University College Of Physicians And Surgeons (2012).
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. Maxim Lee Ritzenberg M.d. 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
7Medicare enrollment records show Maxim Ritzenberg reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94116
- Reassigned Medicare billing, California enrollment
- 1,573 clinicians in this Medicare group
San Francisco, CA 94116
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 842 clinicians in this Medicare group
Oakland, CA 94609
- Reassigned Medicare billing, California enrollment
- 118 clinicians in this Medicare group
Palo Alto, CA 94306
- Reassigned Medicare billing, California enrollment
- 2,460 clinicians in this Medicare group
Fremont, CA 94538
- Reassigned Medicare billing, California enrollment
- 103 clinicians in this Medicare group
San Jose, CA 95128
- Reassigned Medicare billing, California enrollment
- 197 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 2
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 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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
SAN FRANCISCO, CA 94143
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 Maxim Ritzenberg's NPI number?
The NPI number for Maxim Ritzenberg is 1669748158. It was assigned to this individual provider in the NPPES registry on March 28, 2012.
Where is Maxim Ritzenberg located?
Maxim Ritzenberg practices at 505 Parnassus Ave Room M24, San Francisco, CA 94143. The listed phone number is (415) 742-1264.
What is Maxim Ritzenberg's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Maxim Ritzenberg enrolled in Medicare?
Yes. Maxim Ritzenberg 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 Maxim Ritzenberg's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maxim Ritzenberg reassigns Medicare benefits to 7 organizations: City & County Of San Francisco (San Francisco, CA), Permanente Medical Group Inc (San Francisco, CA), University Of California Sfgh Medical Group (San Francisco, CA), Ucsf Health Medical Foundation (Oakland, CA), County Of Santa Clara (Palo Alto, CA) and 2 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 Maxim Ritzenberg'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 Maxim Ritzenberg was last updated on August 7, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Dr. Maxim Lee Ritzenberg, M.D. · NPI 1669748158
Emergency Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since March 28, 2012.
## Identity
- **NPI:** 1669748158 (Entity type: Individual)
- **Enumerated:** March 28, 2012
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 128625 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 505 PARNASSUS AVE, ROOM M24, San Francisco, CA 94143-0208
- **Phone:** (415) 742-1264
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): City & County Of San Francisco (NPI 1528083300, San Francisco, CA); Permanente Medical Group Inc (NPI 1841373800, San Francisco, CA); University Of California Sfgh Medical Group (NPI 1174598296, San Francisco, CA); Ucsf Health Medical Foundation (NPI 1922124866, Oakland, CA); County Of Santa Clara (NPI 1144330614, Palo Alto, CA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Columbia University College Of Physicians And Surgeons, class of 2012
## Record status
- **NPPES last updated:** August 7, 2015
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Source: [NPI Profile](https://npiprofile.com/npi/1669748158) · Data from the CMS NPPES public registry.