MARY ELIZABETH JOHNSON MD
NPI 1902887227
Emergency Medicine in San Francisco, CA
About Mary Elizabeth Johnson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY ELIZABETH JOHNSON MD (NPI 1902887227) is an individual emergency medicine provider in San Francisco, California, licensed in California (A75167) and active in the NPI registry since November 2005. She is enrolled in Medicare PECOS and is a graduate of University Of Oklahoma College Of Medicine (1999).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
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
Mary Elizabeth Johnson 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
4Medicare enrollment records show Mary Johnson reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Arroyo Grande, CA 93420
- Reassigned Medicare billing, California enrollment
- 1,204 clinicians in this Medicare group
Encinitas, CA 92024
- Reassigned Medicare billing, California enrollment
- 221 clinicians in this Medicare group
Encinitas, CA 92024
- Reassigned Medicare billing, California enrollment
- 1,598 clinicians in this Medicare group
San Diego, CA 92103
- Reassigned Medicare billing, California enrollment
- 526 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 17
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 94115 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 94115
SAN FRANCISCO, CA 94115
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 Mary Johnson's NPI number?
The NPI number for Mary Johnson is 1902887227. It was assigned to this individual provider in the NPPES registry on November 14, 2005.
Where is Mary Johnson located?
Mary Johnson practices at 2333 Buchanan St, San Francisco, CA 94115. The listed phone number is (209) 342-2300.
What is Mary Johnson's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Mary Johnson enrolled in Medicare?
Yes. Mary Johnson 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 Mary Johnson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Johnson reassigns Medicare benefits to 4 organizations: Cep America - California (Arroyo Grande, CA), Regents Of The University Of California (Encinitas, CA), Scripps Health (Encinitas, CA) and Regents Of The University Of California (San Diego, 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 Mary Johnson'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 Mary Johnson was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Mary Elizabeth Johnson, MD · NPI 1902887227
Emergency Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since November 14, 2005.
## Identity
- **NPI:** 1902887227 (Entity type: Individual)
- **Enumerated:** November 14, 2005
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A75167 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2333 BUCHANAN ST, San Francisco, CA 94115-1925
- **Phone:** (209) 342-2300 · **Fax:** (209) 524-4240
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Cep America - California (NPI 1548216260, Arroyo Grande, CA); Regents Of The University Of California (NPI 1952637050, Encinitas, CA); Scripps Health (NPI 1700829199, Encinitas, CA); Regents Of The University Of California (NPI 1003934803, San Diego, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Oklahoma College Of Medicine, class of 1999
## Record status
- **NPPES last updated:** July 13, 2026
- **Other identifiers:** Medicaid 00A751670 (CA); Other 00A751670 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1902887227) · Data from the CMS NPPES public registry.