DR. WILLIAM A MEHAN JR. M.D.
NPI 1942421276
Radiology - Diagnostic Radiology in Boston, MA

Q: What is William Mehan's NPI number?

The NPI number for William Mehan is 1942421276. It was assigned to this individual provider in the NPPES registry on May 2, 2007.

Q: What is William Mehan's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Q: When was this NPI record last updated?

The NPPES record for William Mehan was last updated on July 16, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.

Active since May 02, 2007PECOS EnrolledAccepts Medicare Assignment

800 WASHINGTON STREET, BOSTON, MA 02111(617) 636-5000 Get Directions Write a Review

NPPES record last updated: July 16, 2013. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Dr. William A Mehan Jr. M.d. NPPES

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

DR. WILLIAM A MEHAN JR. M.D. (NPI 1942421276) is an individual diagnostic radiology provider in Boston, Massachusetts, licensed in Massachusetts (245931) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, is affiliated with North Shore Medical Center -, and is a graduate of Mcgill University, Faculty Of Medicine (2006).

NPPES Registry Identity

NPI1942421276

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameDR. WILLIAM A MEHAN JR.Credential: M.D.

Location Address800 WASHINGTON STREETBoston, MA 02111

Mailing Address800 Washington St. Box 1013Boston, MA 02111 · (617) 636-5000

Phone(617) 636-5000

Sole ProprietorYes

Medical School CMSMcgill University, Faculty Of MedicineGraduated 2006

Enumeration DateMay 2, 2007

Last NPPES UpdateJuly 16, 2013

✔ NPI 1942421276 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0202X

License✔ Licensed in MA · 245931

Definition

A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

800 WASHINGTON STREET, Boston, MA 02111

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Priority Health.Insurance ›

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. William A Mehan Jr. 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 ID1052589306

PECOS Enrollment IDI20110713000126

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 Reassignments

Medicare enrollment records show William Mehan reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The General Hospital Corporation

1.0 mi

General Acute Care Hospital

55 FRUIT ST, BULFINCH 360
Boston, MA 02114

Reassigned Medicare billing, Massachusetts enrollment
6,234 clinicians in this Medicare group

NPI 1023049236 (617) 726-2000

Massachusetts General Physicians Organization Inc

1.0 mi

Dermatology

55 FRUIT ST, BUL 2
Boston, MA 02114

Reassigned Medicare billing, Massachusetts and New Hampshire enrollments
6,360 clinicians in this Medicare group

NPI 1801874573 (617) 724-0287

Brigham & Womens Physicians Organization Inc

2.4 mi

Internal Medicine

75 FRANCIS ST
Boston, MA 02115

Reassigned Medicare billing, Massachusetts enrollment
4,574 clinicians in this Medicare group

NPI 1033535497 (617) 732-5500

Harbor Medical Associates, Inc.

12 mi

Cardiovascular Disease

541 MAIN ST, SUITE 400
South Weymouth, MA 02190

Reassigned Medicare billing, Massachusetts enrollment
419 clinicians in this Medicare group

NPI 1124079561 (781) 952-1240

Jawad A Shah, MD PC

644 mi

Specialist

4800 S SAGINAW ST, STE 1805
Flint, MI 48507

Reassigned Medicare billing, Michigan enrollment
246 clinicians in this Medicare group

NPI 1942402391 (810) 732-8336

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 28

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.

Injection, gadoterate meglumine, 0.1 ml A9575

Gadoterate meglumine is a contrast agent used in MRI scans to help visualize certain areas of your body more clearly. It's injected into your bloodstream, typically through a vein in your arm, and helps doctors get more detailed images.

4,920 services30 patients

Ct scan head or brain without contrast 70450

A CT scan of the head or brain without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your brain, skull, and other structures inside your head. It helps to detect conditions like strokes, tumors, or injuries. No dye (contrast) is used in this test.

281 services275 patients

Mri scan of brain before and after contrast 70553

An MRI scan of the brain, both before and after contrast, helps visualize different brain structures. Initially, images are taken without a contrast agent. Then, a safe dye is injected which helps highlight certain areas, providing clearer, more detailed images.

158 services154 patients

Mri scan of lower spinal canal without contrast 72148

An MRI scan of the lower spinal canal without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to produce detailed images of your lower spine. This helps identify issues like disc problems, tumors, or nerve conditions. No dye is used.

137 services134 patients

Mri scan of brain without contrast 70551

An MRI scan of the brain without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed images of your brain. It helps in detecting abnormalities like tumors, stroke, inflammation, or infection.

101 services101 patients

Ct scan of blood vessels of head with contrast 70496

A CT scan of the head's blood vessels with contrast is a diagnostic procedure. A special dye (contrast) is injected into your body to make the blood vessels visible on the scan. This helps identify issues like blockages or abnormalities in your head's blood vessels.

96 services96 patients

Mri scan of brain before and after contrast 70553

95 services95 patients

Mri scan of brain without contrast 70551

90 services88 patients

Ct scan of blood vessels of neck with contrast 70498

A CT scan of the neck's blood vessels with contrast is a diagnostic procedure. It uses X-rays and a special dye to create detailed images of your neck's blood vessels. This helps doctors detect issues such as blockages or abnormalities.

84 services84 patients

Mri scan of upper spinal canal without contrast 72141

An MRI scan of the upper spinal canal without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed images of your upper spine. This helps doctors identify issues such as injuries, infections or diseases. No dye is used.

67 services65 patients

Mri scan of lower spinal canal without contrast 72148

60 services60 patients

Mri scan of upper spinal canal without contrast 72141

40 services40 patients

Ct scan of soft tissue of neck with contrast 70491

A CT scan of the neck with contrast is a non-invasive imaging procedure. A special dye is administered to highlight the soft tissues in your neck, making them easier to see. This helps detect issues like infections, tumors, or other abnormalities.

39 services37 patients

Ct scan of soft tissue of neck with contrast 70491

34 services33 patients

Mri scan of blood vessels of head without contrast 70544

An MRI scan of the head's blood vessels without contrast is a non-invasive imaging procedure. It uses a magnetic field and radio waves to create detailed images of the blood vessels in your head. This helps doctors diagnose conditions such as stroke, aneurysm, or other vascular disorders.

34 services34 patients

Ct scan head or brain without contrast 70450

33 services33 patients

Mri scan of lower spinal canal before and after contrast 72158

An MRI scan of the lower spinal canal with contrast is a non-invasive imaging procedure. It uses magnetic fields to generate detailed images of your lower spine. A contrast agent is injected to enhance these images, helping doctors see issues more clearly.

32 services30 patients

Mri scan of blood vessels of head without contrast 70544

30 services28 patients

Mri scan of upper spinal canal before and after contrast 72156

An MRI scan of the upper spinal canal before and after contrast is a non-invasive imaging test. It uses magnetic fields and radio waves to create detailed images of your spine. Contrast dye is injected to enhance these images, providing clearer visuals for accurate diagnosis.

22 services22 patients

Mri scan of middle spinal canal before and after contrast 72157

An MRI scan of the middle spinal canal with contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed images of your spine, both before and after a contrast dye is injected. The dye helps to highlight certain structures, providing a clearer picture for diagnosis.

22 services22 patients

Mri scan of lower spinal canal before and after contrast 72158

21 services21 patients

Mri scan of middle spinal canal without contrast 72146

An MRI scan of the middle spinal canal without contrast is a non-invasive imaging test. It uses magnetic fields and radio waves to create detailed images of your spine. This helps doctors identify any abnormalities or issues in your spinal canal. No dye is used in this procedure.

19 services18 patients

Ct scan of face without contrast 70486

A CT scan of the face without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your face, including bones, soft tissues, and blood vessels. It's often used to diagnose diseases, injuries, or abnormalities. No contrast dye is used in this procedure.

18 services18 patients

Mri scan of middle spinal canal before and after contrast 72157

16 services15 patients

Ct scan of face without contrast 70486

14 services14 patients

Ct scan of blood vessels of head with contrast 70496

14 services14 patients

Mri scan of upper spinal canal before and after contrast 72156

12 services12 patients

Mri scan of blood vessels of neck with contrast 70548

An MRI scan of the neck with contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed pictures of your blood vessels in the neck. A contrast dye may be injected to make these images clearer. This helps identify any abnormalities.

11 services11 patients

Hospital Affiliations CMS Care Compare 5

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

North Shore Medical Center -

Acute Care Hospitals · Salem, MA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220035

Location81 Highland AvenueSalem, MA 01970 · Essex County

Emergency services Birthing friendly

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

Brigham And Women's Hospital

Acute Care Hospitals · Boston, MA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220110

Location75 Francis StreetBoston, MA 02115 · Suffolk County

Emergency services Birthing friendly

Martha's Vineyard Hospital Inc

Critical Access Hospitals · Oak Bluffs, MA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number221300

LocationOne Hospital Road, First Fl, Wing 5, PO Box 1477Oak Bluffs, MA 02557 · Dukes County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02111 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

$78.84 typical visit price

range $21.07 – $155.29

Typical copayment $19.71 (range $5.26 – $38.82)

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.

VANJA TOLJ

Anesthesiology

800 WASHINGTON STREET, #298 ZISKIND BUILDING, 6TH FLOOR
CINCINNATI, MA 02111

Suffolk County (330) 645-5522

FABIOLA ANDREINA REYES CURCIO

Pathology (Anatomic Pathology & Clinical Pathology)

800 WASHINGTON STREET, #802
BOSTON, MA 02111

Suffolk County (617) 636-8006

NIKOLAY BUGAEV M.D.

Surgery (Surgical Critical Care)

800 WASHINGTON STREET
BOSTON, MA 02111

Suffolk County (617) 636-5000

DR. MOHAMMED ABDULLAH BAWAZEER MD

Surgery

800 WASHINGTON STREET, DEPARTMENT OF SURGERY, DIVISION OF TRAUMA SURGERY
BOSTON, MA 02111

Suffolk County (617) 636-4488

DR. MICHAELA MARGOLIS DO

Psychiatry & Neurology (Child & Adolescent Psychiatry)

800 WASHINGTON STREET
BOSTON, MA 02111

Suffolk County (617) 636-7820

DAWIT WORKU KASSA

Obstetrics & Gynecology

800 WASHINGTON STREET
BOSTON, MA 02111

Suffolk County (617) 636-2229

GERARDINA BUETI PA-C

Physician Assistant

800 WASHINGTON STREET
BOSTON, MA 02111

Suffolk County (617) 636-5590

LAUREN GUSS LICSW

Social Worker (Clinical)

800 WASHINGTON STREET
BOSTON, MA 02111

Suffolk County (617) 636-4174

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 Mehan's NPI number?

The NPI number for William Mehan is 1942421276. It was assigned to this individual provider in the NPPES registry on May 2, 2007.

Where is William Mehan located?

William Mehan practices at 800 Washington Street, Boston, MA 02111. The listed phone number is (617) 636-5000.

What is William Mehan's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is William Mehan enrolled in Medicare?

Yes. William Mehan 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 organizations bill Medicare for William Mehan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Mehan reassigns Medicare benefits to 5 organizations: The General Hospital Corporation (Boston, MA), Massachusetts General Physicians Organization Inc (Boston, MA), Brigham & Womens Physicians Organization Inc (Boston, MA), Harbor Medical Associates, Inc. (South Weymouth, MA) and Jawad A Shah, MD PC (Flint, MI). Each 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 William Mehan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Mehan accept?

Health plans from Priority Health list William Mehan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is William Mehan affiliated with any hospitals?

According to CMS data, William Mehan is affiliated with North Shore Medical Center -, Massachusetts General Hospital, Newton-Wellesley Hospital, Brigham And Women's Hospital and Martha's Vineyard Hospital Inc.

When was this NPI record last updated?

The NPPES record for William Mehan was last updated on July 16, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.