CHRISTOPHER ADAM WALKER MD
NPI 1649469701
Emergency Medicine in Oakland, CA
About Christopher Adam Walker Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CHRISTOPHER ADAM WALKER MD (NPI 1649469701) is an individual emergency medicine provider in Oakland, California, licensed in California (A106362) and active in the NPI registry since October 2007. He is enrolled in Medicare PECOS and is a graduate of Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University (2007).
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
Christopher Adam Walker 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
2Medicare enrollment records show Christopher Walker reassigns Medicare billing to 2 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
Richmond, CA 94801
- Reassigned Medicare billing, California enrollment
- 20,078 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 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.
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 Christopher Walker's NPI number?
The NPI number for Christopher Walker is 1649469701. It was assigned to this individual provider in the NPPES registry on October 15, 2007.
Where is Christopher Walker located?
Christopher Walker practices at 3625 Brunell Dr, Oakland, CA 94602. The listed phone number is (216) 513-5788.
What is Christopher Walker's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Christopher Walker enrolled in Medicare?
Yes. Christopher Walker 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 Christopher Walker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Christopher Walker reassigns Medicare benefits to 2 organizations: University Of California Sfgh Medical Group (San Francisco, CA) and Permanente Medical Group Inc (Richmond, 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 Christopher Walker'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 Christopher Walker was last updated on June 23, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Christopher Adam Walker, MD · NPI 1649469701
Emergency Medicine physician in Oakland, California. Individual provider, active in the CMS NPPES registry since October 15, 2007.
## Identity
- **NPI:** 1649469701 (Entity type: Individual)
- **Enumerated:** October 15, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A106362 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 3625 BRUNELL DR, Oakland, CA 94602-4108
- **Phone:** (216) 513-5788
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): University Of California Sfgh Medical Group (NPI 1174598296, San Francisco, CA); Permanente Medical Group Inc (NPI 1235226531, Richmond, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University, class of 2007
## Record status
- **NPPES last updated:** June 23, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1649469701) · Data from the CMS NPPES public registry.