DR. WILLIAM WALLACE ASHLEY JR. M.D., PH.D., M.B.A.
NPI 1033238647
Neurological Surgery in Baltimore, MD
About Dr. William Wallace Ashley Jr. M.d., Ph.d., M.b.a. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM WALLACE ASHLEY JR. M.D., PH.D., M.B.A. (NPI 1033238647) is an individual neurological surgery provider in Baltimore, Maryland, licensed in Maryland (D82113) and active in the NPI registry since March 2007. He is enrolled in Medicare PECOS, is affiliated with Sinai Hospital Of Baltimore, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (2001).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
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. William Wallace Ashley Jr. M.d., Ph.d., M.b.a. 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
5Medicare enrollment records show William Ashley reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21209
- Reassigned Medicare billing, Maryland enrollment
- 27 clinicians in this Medicare group
Towson, MD 21204
- Reassigned Medicare billing, Maryland enrollment
- 501 clinicians in this Medicare group
Hagerstown, MD 21742
- Reassigned Medicare billing, Maryland enrollment
- 242 clinicians in this Medicare group
Chicago, IL 60609
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Mount Sinai Community Foundation
- 646 clinicians in this Medicare group
Chicago, IL 60621
- Reassigned Medicare billing, Illinois enrollment
- 2,127 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 12
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Sinai Hospital Of Baltimore
Acute Care Hospitals · Baltimore, MDCarroll Hospital Center
Acute Care Hospitals · Westminster, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21209 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.
BALTIMORE, MD 21209
BALTIMORE, MD 21209
BALTIMORE, MD 21209
BALTIMORE, MD 21209
BALTIMORE, MD 21209
BALTIMORE, MD 21209
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 William Ashley's NPI number?
The NPI number for William Ashley is 1033238647. It was assigned to this individual provider in the NPPES registry on March 28, 2007.
Where is William Ashley located?
William Ashley practices at 5051 Greenspring Ave Suite 300, Baltimore, MD 21209. The listed phone number is (410) 601-4417.
What is William Ashley's specialty?
The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.
Is William Ashley enrolled in Medicare?
Yes. William Ashley 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 William Ashley's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Ashley reassigns Medicare benefits to 5 organizations: Lifebridge Orthopedic Specialists, LLC (Baltimore, MD), University Of Maryland St. Joseph Medical Group, LLC (Towson, MD), Medical Practices Of Antietam LLC (Hagerstown, MD), Smg South State Health Center (Chicago, IL) and The Board Of Trustees Of The University Of Illinois (Chicago, IL). 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 William Ashley's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is William Ashley affiliated with any hospitals?
According to CMS data, William Ashley is affiliated with Sinai Hospital Of Baltimore and Carroll Hospital Center.
When was this NPI record last updated?
The NPPES record for William Ashley was last updated on November 11, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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. William Wallace Ashley Jr., M.D., PH.D., M.B.A. · NPI 1033238647
Neurological Surgery physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since March 28, 2007.
## Identity
- **NPI:** 1033238647 (Entity type: Individual)
- **Enumerated:** March 28, 2007
- **Primary specialty:** Neurological Surgery · taxonomy 207T00000X
- **State license:** D82113 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 5051 GREENSPRING AVE, SUITE 300, Baltimore, MD 21209-4354
- **Phone:** (410) 601-4417 · **Fax:** (410) 601-7138
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Lifebridge Orthopedic Specialists, LLC (NPI 1841696697, Baltimore, MD); University Of Maryland St. Joseph Medical Group, LLC (NPI 1770836785, Towson, MD); Medical Practices Of Antietam LLC (NPI 1710854963, Hagerstown, MD); Smg South State Health Center (NPI 1366787012, Chicago, IL); The Board Of Trustees Of The University Of Illinois (NPI 1427600345, Chicago, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 2001
## Record status
- **NPPES last updated:** November 11, 2016
- **Other identifiers:** Other 520486540 (MD)
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Source: [NPI Profile](https://npiprofile.com/npi/1033238647) · Data from the CMS NPPES public registry.