DR. JOHN EDWARD MENDELSON MD
NPI 1891889341
Internal Medicine in San Francisco, CA
About Dr. John Edward Mendelson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN EDWARD MENDELSON MD (NPI 1891889341) is an individual internal medicine provider in San Francisco, California, licensed in California (G49959) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS and is a graduate of University Of California, San Francisco School Of Medicine (1982).
NPPES Registry Identity
Specialties & Licenses 2
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
Dr. John Edward Mendelson 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 John Mendelson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Francisco, CA 94102
- Reassigned Medicare billing, California enrollment
- 7 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94109 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 94109
SAN FRANCISCO, CA 94109
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 John Mendelson's NPI number?
The NPI number for John Mendelson is 1891889341. It was assigned to this individual provider in the NPPES registry on October 2, 2006.
Where is John Mendelson located?
John Mendelson practices at 909 Hyde St 210, San Francisco, CA 94109. The listed phone number is (415) 474-7900.
What is John Mendelson's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Mendelson enrolled in Medicare?
Yes. John Mendelson 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 John Mendelson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Mendelson reassigns Medicare benefits to Ria Health PC (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 John Mendelson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Mendelson accept?
Health plans from Medica, Oscar Health, Oscar Insurance Company and UnitedHealthcare list John Mendelson 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 John Mendelson was last updated on February 5, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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. John Edward Mendelson, MD · NPI 1891889341
Internal Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since October 2, 2006.
## Identity
- **NPI:** 1891889341 (Entity type: Individual)
- **Enumerated:** October 2, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** G49959 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 909 HYDE ST, 210, San Francisco, CA 94109-4822
- **Phone:** (415) 474-7900 · **Fax:** (415) 474-7930
## 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:** Ria Health PC (NPI 1326539404, San Francisco, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Francisco School Of Medicine, class of 1982
## Record status
- **NPPES last updated:** February 5, 2008
- **Other identifiers:** Medicaid G49959 (CA); Medicare UPIN A51519 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1891889341) · Data from the CMS NPPES public registry.