PRESTON CHARLES MAXIM MD
NPI 1427090042
Emergency Medicine in San Francisco, CA
About Preston Charles Maxim Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
PRESTON CHARLES MAXIM MD (NPI 1427090042) is an individual emergency medicine provider in San Francisco, California, licensed in California (A70159) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Washington School Of Medicine (1995).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Accepted Insurance
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
Preston Charles Maxim 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
7Medicare enrollment records show Preston Maxim 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 94110
- Reassigned Medicare billing, California enrollment
- 842 clinicians in this Medicare group
San Francisco, CA 94116
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
San Ramon, CA 94583
- Reassigned Medicare billing, California enrollment
- 168 clinicians in this Medicare group
Delano, CA 93215
- Reassigned Medicare billing, California enrollment
- 301 clinicians in this Medicare group
Laveen, AZ 85339
- Reassigned Medicare billing, Texas enrollment
- 482 clinicians in this Medicare group
Leupp, AZ 86035
- Reassigned Medicare billing, Texas enrollment
- 219 clinicians in this Medicare group
Trinidad, CO 81082
- Reassigned Medicare billing, Arizona and New Mexico enrollments
- 71 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 3
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 94110 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 94110
SAN FRANCISCO, CA 94110
SAN FRANCISCO, CA 94110
SAN FRANCISCO, CA 94110
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 Preston Maxim's NPI number?
The NPI number for Preston Maxim is 1427090042. It was assigned to this individual provider in the NPPES registry on June 11, 2006.
Where is Preston Maxim located?
Preston Maxim practices at 1001 Potrero Ave Rm 1e21, San Francisco, CA 94110. The listed phone number is (415) 206-5753.
What is Preston Maxim's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Preston Maxim enrolled in Medicare?
Yes. Preston Maxim 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 Preston Maxim's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Preston Maxim reassigns Medicare benefits to 7 organizations: University Of California Sfgh Medical Group (San Francisco, CA), Permanente Medical Group Inc (San Francisco, CA), San Francisco Physicians International Medical Group, Inc (San Ramon, CA), Team Physicians Of California Medical Group Inc (Delano, CA), Gila River Health Care Corporation (Laveen, AZ) 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 Preston Maxim's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Preston Maxim accept?
Health plans from Blue Cross Blue Shield of Arizona list Preston Maxim as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Preston Maxim was last updated on January 16, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.
# Preston Charles Maxim, MD · NPI 1427090042
Emergency Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since June 11, 2006.
## Identity
- **NPI:** 1427090042 (Entity type: Individual)
- **Enumerated:** June 11, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A70159 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1001 POTRERO AVE, RM 1E21, San Francisco, CA 94110-3518
- **Phone:** (415) 206-5753 · **Fax:** (415) 206-5818
## 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): University Of California Sfgh Medical Group (NPI 1174598296, San Francisco, CA); Permanente Medical Group Inc (NPI 1841373800, San Francisco, CA); San Francisco Physicians International Medical Group, Inc (NPI 1841220720, San Ramon, CA); Team Physicians Of California Medical Group Inc (NPI 1447288345, Delano, CA); Gila River Health Care Corporation (NPI 1376538231, Laveen, AZ); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 1995
## Record status
- **NPPES last updated:** January 16, 2025
- **Other identifiers:** Other 930100761 (CA); Medicaid 00A701590 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1427090042) · Data from the CMS NPPES public registry.