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DR. WILLIAM HEMSLEY MERWIN III M.D.
NPI 1043697600
Student in an Organized Health Care Education/Training Program in Baltimore, MD

Active since May 04, 2015PECOS EnrolledAccepts Medicare Assignment
201 E UNIVERSITY PKWY DEPT OF, BALTIMORE, MD 21218(410) 554-2284(410) 554-2184 Get Directions Write a Review

NPPES record last updated: June 11, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jun 11, 2025, Jun 15, 2021, Jan 16, 2019 and 4 more (7 updates tracked since 2017).

About Dr. William Hemsley Merwin Iii M.d. NPPES

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

DR. WILLIAM HEMSLEY MERWIN III M.D. (NPI 1043697600) is an individual student in an organized health care education/training program in Baltimore, Maryland and active in the NPI registry since May 2015. He is enrolled in Medicare PECOS, is affiliated with Medstar Franklin Square Medical Center, and is a graduate of Georgetown University School Of Medicine (2015).

NPPES Registry Identity

NPI1043697600
Entity TypeIndividualMale
Primary Taxonomy390200000X
Provider Legal NameDR. WILLIAM HEMSLEY MERWIN IIICredential: M.D.
Location Address201 E UNIVERSITY PKWY DEPT OFBaltimore, MD 21218
Mailing Address201 E University PkwyBaltimore, MD 21218-2829 · (410) 554-2284 · Fax (410) 554-2184
Phone(410) 554-2284
Fax(410) 554-2184
Sole ProprietorYes
Medical School CMSGeorgetown University School Of MedicineGraduated 2015
Enumeration DateMay 4, 2015
Last NPPES UpdateJune 11, 20257 updates tracked since enumeration
NPPES CertifiedJune 11, 2025
✔ NPI 1043697600 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyStudent in an Organized Health Care Education/Training ProgramStudent, Health Care
Taxonomy Code390200000X
Definition
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
Also ListedInternal MedicineTaxonomy 207R00000X · License D0091613 (MD)
201 E UNIVERSITY PKWY DEPT OF, Baltimore, MD 21218
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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

Dr. William Hemsley Merwin Iii 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.

PECOS PAC ID5799185633
PECOS Enrollment IDI20210614002598
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.

Hospital Affiliations CMS Care Compare

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

Medstar Franklin Square Medical Center

Acute Care Hospitals · Rosedale, MD
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number210015
Location9000 Franklin Square DriveRosedale, MD 21237 · Baltimore County
Emergency services Birthing friendly

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
1 supplier16 claims16 services$15.38 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
1 supplier25 claims25 services$71.95 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

DR. AHMED TAREK MOHAMED ABDELHALIM MD
Student in an Organized Health Care Education/Training Program
201 E UNIVERSITY PKWY DEPT OF
BALTIMORE, MD 21218
Baltimore City (410) 554-2284
MAHVASH MOZAFARIAN
Internal Medicine
201 E UNIVERSITY PKWY DEPT OF
BALTIMORE, MD 21218
Baltimore City (410) 554-2284
SHIVA SHAGHAGHI MD
Student in an Organized Health Care Education/Training Program
201 E UNIVERSITY PKWY DEPT OF
BALTIMORE, MD 21218
Baltimore City (410) 554-2284
DR. BASEM AL ACHRAS
Internal Medicine
201 E UNIVERSITY PKWY DEPT OF
BALTIMORE, MD 21218
Baltimore City (410) 554-2284
LIBERTIE BROUSSARD MD, MHS
Student in an Organized Health Care Education/Training Program
201 E UNIVERSITY PKWY DEPT OF
BALTIMORE, MD 21218
Baltimore City (410) 554-2284
DR. CLAUDIA GEORGES MD
Internal Medicine (Adolescent Medicine)
201 E UNIVERSITY PKWY DEPT OF
BALTIMORE, MD 21218
Baltimore City (410) 554-2284
NOOSHIN MIRKHESHTI MD
Student in an Organized Health Care Education/Training Program
201 E UNIVERSITY PKWY DEPT OF
BALTIMORE, MD 21218
Baltimore City (410) 554-2284
LUKE AUSTIN TORRE-HEALY MD, PHD
Student in an Organized Health Care Education/Training Program
201 E UNIVERSITY PKWY DEPT OF
BALTIMORE, MD 21218
Baltimore City (410) 554-2284

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 Merwin's NPI number?

The NPI number for William Merwin is 1043697600. It was assigned to this individual provider in the NPPES registry on May 4, 2015.

Where is William Merwin located?

William Merwin practices at 201 E University Pkwy Dept Of, Baltimore, MD 21218. The listed phone number is (410) 554-2284.

What is William Merwin's specialty?

The primary specialty registered for this NPI is Student in an Organized Health Care Education/Training Program with taxonomy code 390200000X.

Is William Merwin enrolled in Medicare?

Yes. William Merwin 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 Merwin affiliated with any hospitals?

According to CMS data, William Merwin is affiliated with Medstar Franklin Square Medical Center.

When was this NPI record last updated?

The NPPES record for William Merwin was last updated on June 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.