DR. MATTHEW KIEFER MD
NPI 1942573258
Emergency Medicine in Oakland, CA
About Dr. Matthew Kiefer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MATTHEW KIEFER MD (NPI 1942573258) is an individual emergency medicine provider in Oakland, California, licensed in California (A123937) and active in the NPI registry since February 2012. He is enrolled in Medicare PECOS and is a graduate of Other (2011).
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. Matthew Kiefer 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
3Medicare enrollment records show Matthew Kiefer reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oakland, CA 94602
- Reassigned Medicare billing, California enrollment
- 900 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
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94602 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.
OAKLAND, CA 94602
OAKLAND, CA 94602
OAKLAND, CA 94602
OAKLAND, CA 94602
OAKLAND, CA 94602
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 Matthew Kiefer's NPI number?
The NPI number for Matthew Kiefer is 1942573258. It was assigned to this individual provider in the NPPES registry on February 16, 2012.
Where is Matthew Kiefer located?
Matthew Kiefer practices at 1411 East 31st Street Alameda County Medical Center - Highland Campus, Oakland, CA 94602. The listed phone number is (917) 699-8581.
What is Matthew Kiefer's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Matthew Kiefer enrolled in Medicare?
Yes. Matthew Kiefer 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 Matthew Kiefer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Matthew Kiefer reassigns Medicare benefits to 3 organizations: Alameda Health System (Oakland, CA), San Francisco Physicians International Medical Group, Inc (San Ramon, CA) and Team Physicians Of California Medical Group Inc (Delano, 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 Matthew Kiefer'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 Matthew Kiefer was last updated on October 13, 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. Matthew Kiefer, MD · NPI 1942573258
Emergency Medicine physician in Oakland, California. Individual provider, active in the CMS NPPES registry since February 16, 2012.
## Identity
- **NPI:** 1942573258 (Entity type: Individual)
- **Enumerated:** February 16, 2012
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A123937 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1411 EAST 31ST STREET, ALAMEDA COUNTY MEDICAL CENTER - HIGHLAND CAMPUS, Oakland, CA 94602-1092
- **Phone:** (917) 699-8581
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Alameda Health System (NPI 1740332931, Oakland, CA); San Francisco Physicians International Medical Group, Inc (NPI 1841220720, San Ramon, CA); Team Physicians Of California Medical Group Inc (NPI 1447288345, Delano, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2011
## Record status
- **NPPES last updated:** October 13, 2015
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Source: [NPI Profile](https://npiprofile.com/npi/1942573258) · Data from the CMS NPPES public registry.