ALEXANDER O. WALKER III M.D.
NPI 1033182688
Emergency Medicine in Melrose, MA
About Alexander O. Walker Iii M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDER O. WALKER III M.D. (NPI 1033182688) is an individual emergency medicine provider in Melrose, Massachusetts, licensed in Massachusetts (216791) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Alexander O. Walker Iii M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Alexander Walker reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Melrose, MA 02176
- Reassigned Medicare billing, Massachusetts enrollment
- 23 clinicians in this Medicare group
Reading, MA 01867
- Reassigned Medicare billing, Massachusetts enrollment
- 20 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 02176 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.
MELROSE, MA 02176
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 Alexander Walker's NPI number?
The NPI number for Alexander Walker is 1033182688. It was assigned to this individual provider in the NPPES registry on February 13, 2006.
Where is Alexander Walker located?
Alexander Walker practices at 585 Lebanon St, Melrose, MA 02176. The listed phone number is (781) 979-3635.
What is Alexander Walker's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Alexander Walker enrolled in Medicare?
Yes. Alexander Walker is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Alexander Walker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Walker reassigns Medicare benefits to 2 organizations: Melrose Wakefield Emergency Physicians, Inc. (Melrose, MA) and Hallmark Health Urgent Care Physicians LLC (Reading, MA). 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 Alexander 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 Alexander Walker was last updated on April 28, 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.
# Alexander O. Walker III, M.D. · NPI 1033182688
Emergency Medicine physician in Melrose, Massachusetts. Individual provider, active in the CMS NPPES registry since February 13, 2006.
## Identity
- **NPI:** 1033182688 (Entity type: Individual)
- **Enumerated:** February 13, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 216791 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 585 LEBANON ST, Melrose, MA 02176-3225
- **Phone:** (781) 979-3635
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): Melrose Wakefield Emergency Physicians, Inc. (NPI 1790730539, Melrose, MA); Hallmark Health Urgent Care Physicians LLC (NPI 1184066912, Reading, MA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 28, 2008
- **Other identifiers:** Medicare PIN UX0913 (MA); Other J26468 (MA); Medicaid 2013568 (MA); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1033182688) · Data from the CMS NPPES public registry.