DR. ELIZABETH COX WILLIAMS MD
NPI 1700052446
Anesthesiology in Baltimore, MD
About Dr. Elizabeth Cox Williams Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ELIZABETH COX WILLIAMS MD (NPI 1700052446) is an individual anesthesiology provider in Baltimore, Maryland, licensed in Massachusetts (251333) and active in the NPI registry since May 2008. She is enrolled in Medicare PECOS, is affiliated with University Of Maryland Medical Center, and maintains a secondary practice location in Baltimore.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 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. Elizabeth Cox Williams 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 Reassignment
Medicare enrollment records show Elizabeth Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Baltimore, MD 21201
- Reassigned Medicare billing, Maryland enrollment
- Medicare enrollment name: University Of Maryland Anesthesiology Associates PA
- 303 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 5
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
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, MDOther Providers at the Same Location NPPES 19
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Elizabeth Williams's NPI number?
The NPI number for Elizabeth Williams is 1700052446. It was assigned to this individual provider in the NPPES registry on May 2, 2008.
Where is Elizabeth Williams located?
Elizabeth Williams practices at 22 S Greene St Fl 11, Baltimore, MD 21201. The listed phone number is (667) 214-1616.
What is Elizabeth Williams's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Elizabeth Williams enrolled in Medicare?
Yes. Elizabeth Williams 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 organization bills Medicare for Elizabeth Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Elizabeth Williams reassigns Medicare benefits to University Of Maryland Anesthesiology Associates P.A. (Baltimore, MD). The 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 Elizabeth Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Elizabeth Williams affiliated with any hospitals?
According to CMS data, Elizabeth Williams is affiliated with University Of Maryland Medical Center.
When was this NPI record last updated?
The NPPES record for Elizabeth Williams was last updated on January 17, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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. Elizabeth Cox Williams, MD · NPI 1700052446
Anesthesiology physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since May 2, 2008.
## Identity
- **NPI:** 1700052446 (Entity type: Individual)
- **Enumerated:** May 2, 2008
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 251333 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 22 S GREENE ST FL 11, Baltimore, MD 21201
- **Phone:** (667) 214-1616 · **Fax:** (410) 328-1674
## 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:** University Of Maryland Anesthesiology Associates P.A. (NPI 1033915145, Baltimore, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Duke University School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** January 17, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1700052446) · Data from the CMS NPPES public registry.