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DEREK A BARCLAY M.D.
NPI 1801820659
Emergency Medicine - Medical Toxicology in Boston, MA

Active since July 10, 2006PECOS Enrolled
BRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS STREET, NEVILLE HOUSE, BOSTON, MA 02115(617) 732-5656 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Derek A Barclay M.d. NPPES

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

DEREK A BARCLAY M.D. (NPI 1801820659) is an individual medical toxicology provider in Boston, Massachusetts, licensed in Massachusetts (226628) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1801820659
Entity TypeIndividualMale
Primary Taxonomy207PT0002X
Provider Legal NameDEREK A BARCLAYCredential: M.D.
Location AddressBRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS STREET, NEVILLE HOUSEBoston, MA 02115
Mailing Address20 Norris St, Apartment #2Cambridge, MA 02140-1815 · (617) 732-5656
Phone(617) 732-5656
Sole ProprietorNo
Enumeration DateJuly 10, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1801820659 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency Medicine · Medical ToxicologyAllopathic & Osteopathic Physicians
Taxonomy Code207PT0002X
License✔ Licensed in MA · 226628
Definition
Medical toxicologists are physicians who specialize in the prevention, evaluation, treatment and monitoring of injury and illness from exposures to drugs and chemicals, as well as biological and radiological agents. Medical toxicologists care for people in clinical, academic, governmental and public health settings, and provide poison control center leadership. Important areas of medical toxicology include acute drug poisoning, adverse drug events, drug abuse, addiction and withdrawal, chemicals and hazardous materials, terrorism preparedness, venomous bites and stings and environmental and workplace exposures.
BRIGHAM AND WOMEN'S HOSPITAL, Boston, MA 02115
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Derek A Barclay M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Medicare Billing Reassignment

Medicare enrollment records show Derek Barclay reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Paragon Contracting Services LLC
1,048 mi
Emergency Medicine
810 SAINT VINCENTS DR
Birmingham, AL 35205
  • Reassigned Medicare billing, Florida enrollment
  • 802 clinicians in this Medicare group
NPI 1225071459 (205) 939-7100

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 4

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.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
226 services219 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
99 services99 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
45 services45 patients
Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
25 services25 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02115 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
$97.64 typical visit price
range $63.72 – $189.86
Typical copayment $24.41 (range $15.93 – $47.46)
Most-billed visit code 99203
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
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.

MS. JOANNE RUEL WEINTRAUB
Nurse Practitioner
BRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS STREET ADM A BUILDING, 3RD FLOOR
BOSTON, MA 02115
Suffolk County (617) 732-7129
GREGORY STEPHEN COUPER MD
Thoracic Surgery (Cardiothoracic Vascular Surgery)
BRIGHAM AND WOMEN'S HOSPITAL, DIVISION OF CARDIAC SURGERY
BOSTON, MA 02115
Suffolk County (617) 732-5500
DR. SIDDHARTH JAGDISH TRIVEDI BSC, BMEDSCI, MBBS,
Student in an Organized Health Care Education/Training Program
BRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS STREET
BOSTON, MA 02115
Suffolk County (617) 732-6273
SHELSEY W. JOHNSON MD
Internal Medicine (Pulmonary Disease)
BRIGHAM AND WOMEN'S HOSPITAL, 15 FRANCIS STREET, PBB CA3
BOSTON, MA 02115
Suffolk County (617) 525-9733
MRS. CAROL HOLTON GLASSROTH RN, MSN, APN
Nurse Practitioner (Adult Health)
BRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS ST
BOSTON, MA 02115
Suffolk County (617) 378-5485
JOHN PATRICK FINNIGAN JR. MD, PHD
Student in an Organized Health Care Education/Training Program
BRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS STREET
BOSTON, MA 02115
Suffolk County (617) 732-5500
DR. AIDEN Y FENG MD, MBA
Anesthesiology
BRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS ST, CWN-L1
BOSTON, MA 02115
Suffolk County (484) 744-2177
FREDERIC RACICOT M.D.
Student in an Organized Health Care Education/Training Program
BRIGHAM AND WOMEN'S HOSPITAL, 75 FRANCIS STREET
BOSTON, MA 02115
Suffolk County (617) 732-5500

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 Derek Barclay's NPI number?

The NPI number for Derek Barclay is 1801820659. It was assigned to this individual provider in the NPPES registry on July 10, 2006.

Where is Derek Barclay located?

Derek Barclay practices at Brigham And Women's Hospital 75 Francis Street, Neville House, Boston, MA 02115. The listed phone number is (617) 732-5656.

What is Derek Barclay's specialty?

The primary specialty registered for this NPI is Emergency Medicine, specializing in Medical Toxicology, with taxonomy code 207PT0002X.

Is Derek Barclay enrolled in Medicare?

Yes. Derek Barclay is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Derek Barclay's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Derek Barclay reassigns Medicare benefits to Paragon Contracting Services LLC (Birmingham, AL). 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 Derek Barclay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Derek Barclay was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.