WILLIAM SANDERSON TWADDELL M.D.
NPI 1538296124
Pathology - Anatomic Pathology & Clinical Pathology in Baltimore, MD
About William Sanderson Twaddell M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM SANDERSON TWADDELL M.D. (NPI 1538296124) is an individual anatomic pathology & clinical pathology provider in Baltimore, Maryland, licensed in Maryland (D68076) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, is affiliated with University Of Maryland Medical Center, and is a graduate of Columbia University College Of Physicians And Surgeons (2004).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
William Sanderson Twaddell M.d. 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.
Areas of Expertise CMS Part B claims 14
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Maryland Medical Center
Acute Care Hospitals · Baltimore, MDUniversity Of MD Shore Medical Ctr At Chestertown
Acute Care Hospitals · Chestertown, MDUniversity Of MD Charles Regional Medical Center
Acute Care Hospitals · La Plata, MDUniversity Of MD Shore Medical Center At Easton
Acute Care Hospitals · Easton, MDUniversity Of MD Medical Center Midtown Campus
Acute Care Hospitals · Baltimore, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21201 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 21201
BALTIMORE, MD 21201
BALTIMORE, MD 21201
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 Twaddell's NPI number?
The NPI number for William Twaddell is 1538296124. It was assigned to this individual provider in the NPPES registry on February 28, 2007. The provider is also known as William S Twaddell MD.
Where is William Twaddell located?
William Twaddell practices at 22 S Greene St Nbw73, Baltimore, MD 21201. The listed phone number is (410) 328-5555.
What is William Twaddell's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.
Is William Twaddell enrolled in Medicare?
Yes. William Twaddell 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.
Is William Twaddell affiliated with any hospitals?
According to CMS data, William Twaddell is affiliated with University Of Maryland Medical Center, University Of MD Shore Medical Ctr At Chestertown, University Of MD Charles Regional Medical Center, University Of MD Shore Medical Center At Easton and University Of MD Medical Center Midtown Campus.
When was this NPI record last updated?
The NPPES record for William Twaddell was last updated on May 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.
