THERESA LYNN WILLIAMSON MD
NPI 1194143644
Neurological Surgery in Providence, RI

Active since April 02, 2014PECOS EnrolledAccepts Medicare Assignment
593 EDDY ST, PROVIDENCE, RI 02903(401) 793-9166(401) 444-2788 Get Directions Write a Review

NPPES record last updated: September 5, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Theresa Lynn Williamson Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

THERESA LYNN WILLIAMSON MD (NPI 1194143644) is an individual neurological surgery provider in Providence, Rhode Island, licensed in Rhode Island (MD20852) and active in the NPI registry since April 2014. She is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and maintains a secondary practice location in Providence.

NPPES Registry Identity

NPI1194143644
Entity TypeIndividualFemale
Primary Taxonomy207T00000X
Provider Legal NameTHERESA LYNN WILLIAMSONCredential: MD
Location Address593 EDDY STProvidence, RI 02903-4923
Mailing Address593 Eddy StProvidence, RI 02903-4923 · (401) 793-9166 · Fax (401) 444-2788
Fax(401) 444-2788
Sole ProprietorNo
Medical School CMSYale University School Of MedicineGraduated 2014
Enumeration DateApril 2, 2014
Last NPPES UpdateSeptember 5, 2025
NPPES CertifiedSeptember 5, 2025
NPI 1194143644 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyNeurological SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207T00000X
Licenses Licensed in RI · MD20852 Licensed in MA · T289635
Definition
A neurological surgeon provides the operative and non-operative management (i.e., prevention, diagnosis, evaluation, treatment, critical care, and rehabilitation) of disorders of the central, peripheral, and autonomic nervous systems, including their supporting structures and vascular supply; the evaluation and treatment of pathological processes which modify function or activity of the nervous system; and the operative and non-operative management of pain. A neurological surgeon treats patients with disorders of the nervous system; disorders of the brain, meninges, skull, and their blood supply, including the extracranial carotid and vertebral arteries; disorders of the pituitary gland; disorders of the spinal cord, meninges, and vertebral column, including those which may require treatment by spinal fusion or instrumentation; and disorders of the cranial and spinal nerves throughout their distribution.
593 EDDY ST, Providence, RI 02903

Secondary Practice Location 1

Location 1164 Summit AveProvidence, RI 02906-2853 · Phone (401) 793-9166 · Fax (401) 444-2788

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

Theresa Lynn Williamson 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.

PECOS PAC ID5597162990
PECOS Enrollment IDI20210928002415, I20250913000321
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 9

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
29 services26 patients
Insertion of cage or mesh device to spine bone and disc space during spine fusion 22853
Spine fusion is a procedure to join two or more vertebrae. During this process, a cage or mesh device is inserted into the spine bone and disc space. This helps to stabilize the spine, reduce pain, and improve functionality. The device acts as a bridge for new bone to grow on.
25 services18 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
25 services25 patients
Fusion of additional segment of spine 22614
Fusion of an additional segment of the spine is a surgical procedure to join two or more vertebrae together. This is done to stabilize the spine and reduce pain or correct a deformity. The procedure involves using bone grafts, rods, or screws to secure the spine.
22 services11 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
18 services18 patients
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes 99221
Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.
16 services16 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Massachusetts General Hospital

Acute Care Hospitals · Boston, MA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220071
Location55 Fruit StreetBoston, MA 02114 · Suffolk County
Emergency services Birthing friendly

Newton-Wellesley Hospital

Acute Care Hospitals · Newton, MA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220101
Location2014 Washington StreetNewton, MA 02462 · Middlesex County
Emergency services Birthing friendly

Rhode Island Hospital

Acute Care Hospitals · Providence, RI
3/5 CMS rating
OwnershipTribal
CMS Certification Number410007
Location593 Eddy StreetProvidence, RI 02903 · Providence County
Emergency services

The Miriam Hospital

Acute Care Hospitals · Providence, RI
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number410012
Location164 Summit AvenueProvidence, RI 02906 · Providence County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02903 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$134.17 typical visit price
range $58.57 – $177.03
Typical copayment $33.54 (range $14.64 – $44.25)
Most-billed visit code 99204
Established Patient
$72.93 typical visit price
range $18.92 – $144.38
Typical copayment $18.23 (range $4.73 – $36.09)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

Anesthesiology
593 EDDY ST, APC 6
PROVIDENCE, RI 02903
Surgery
593 EDDY ST
PROVIDENCE, RI 02903
General Acute Care Hospital
593 EDDY ST, MAIN 4
PROVIDENCE, RI 02903
Pathology (Anatomic Pathology & Clinical Pathology)
593 EDDY ST
PROVIDENCE, RI 02903
Psychiatry & Neurology (Neurology)
593 EDDY ST
PROVIDENCE, RI 02903
Student in an Organized Health Care Education/Training Program
593 EDDY ST
PROVIDENCE, RI 02903
Physician Assistant
593 EDDY ST
PROVIDENCE, RI 02903
Student in an Organized Health Care Education/Training Program
593 EDDY ST
PROVIDENCE, RI 02903

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 Theresa Williamson's NPI number?

The NPI number for Theresa Williamson is 1194143644. It was assigned to this individual provider in the NPPES registry on April 2, 2014.

Where is Theresa Williamson located?

Theresa Williamson practices at 593 Eddy St, Providence, RI 02903. The listed phone number is (401) 793-9166.

What is Theresa Williamson's specialty?

The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.

Is Theresa Williamson enrolled in Medicare?

Yes. Theresa Williamson 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 Theresa Williamson affiliated with any hospitals?

According to CMS data, Theresa Williamson is affiliated with Massachusetts General Hospital, Newton-Wellesley Hospital, Rhode Island Hospital and The Miriam Hospital.

When was this NPI record last updated?

The NPPES record for Theresa Williamson was last updated on September 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.