Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mr. Marshall K. Walker, MD

Individual provider Diagnostic Radiology Physician · NPI 1619295441

Mr. Marshall K. Walker, MD practises Diagnostic Radiology in Mobile, Alabama. Graduated from Tulane University School of Medicine in 2010, 16 years ago. Practices with Radiology Imaging Specialists LLC, an 18-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Alabama, Florida, Kentucky and Mississippi.

Years since qualifying
16
Trained at
Tulane University School of Medicine
Licensed in
AL, FL, KY, MS
In the registry since
2010
Specialties on file
8
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3610 Springhill Memorial Dr N
Mobile, AL 36608-1162
Phone: (251) 410-3600
Fax: (251) 410-3743
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 4250 Hospital Dr, Marianna, FL 32446-1917 — (850) 526-2200

Specialties & licences

Vascular & Interventional Radiology Physician (primary) Taxonomy 2085R0204X · Licence MD.31143 (AL)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence C3071 (KY)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 24945 (MS)
Vascular & Interventional Radiology Physician Taxonomy 2085R0204X · Licence ME170526 (FL)
Vascular & Interventional Radiology Physician Taxonomy 2085R0204X · Licence 31143 (AL)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X
Vascular & Interventional Radiology Physician Taxonomy 2085R0204X · Licence 24945 (MS)
Vascular & Interventional Radiology Physician Taxonomy 2085R0204X · Licence C3071 (KY)

Record details

NPI number1619295441
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 4, 2010
Last updated in NPPESNovember 21, 2025
Certification dateNovember 21, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolTULANE UNIVERSITY SCHOOL OF MEDICINE
Graduated 2010 (16 years in practice)
Group practice Radiology Imaging Specialists Llc — 18 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients1,510
Services billed 4,106 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $125 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Radiology Imaging Specialists LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 18 clinicians in the practice; 3 are shown here.

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