THOMAS AN MD
NPI 1912427113
Radiology - Diagnostic Radiology in Boston, MA

Q: What is Thomas An's NPI number?

The NPI number for Thomas An is 1912427113. It was assigned to this individual provider in the NPPES registry on June 20, 2017.

Q: What is Thomas An'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 Thomas An was last updated on December 21, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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 June 20, 2017PECOS EnrolledAccepts Medicare Assignment

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST., BOSTON, MA 02114(617) 726-5518 Get Directions Write a Review

NPPES record last updated: December 21, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Thomas An Md NPPES

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

THOMAS AN MD (NPI 1912427113) is an individual diagnostic radiology provider in Boston, Massachusetts, licensed in Massachusetts (281918) and active in the NPI registry since June 2017. He is enrolled in Medicare PECOS, is affiliated with Massachusetts General Hospital, and is a graduate of Vanderbilt University School Of Medicine (2017).

NPPES Registry Identity

NPI1912427113

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameTHOMAS ANCredential: MD

Location AddressMASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.Boston, MA 02114

Mailing AddressMassachusetts General Hospital, 55 Fruit St.Boston, MA 02114 · (617) 726-5518

Phone(617) 726-5518

Sole ProprietorNo

Medical School CMSVanderbilt University School Of MedicineGraduated 2017

Enumeration DateJune 20, 2017

Last NPPES UpdateDecember 21, 2023

NPPES CertifiedDecember 21, 2023

✔ NPI 1912427113 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 · 281918

Definition

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

Also ListedSurgeryTaxonomy 208600000X · License 272811 (MA)

MASSACHUSETTS GENERAL HOSPITAL, Boston, MA 02114

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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 and accepts Medicare assignment

Thomas An 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 ID1456624741

PECOS Enrollment IDI20230510001912

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 Thomas An reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The General Hospital Corporation

1.8 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

1.8 mi

Dermatology

55 FRUIT ST, BUL 2
Boston, MA 02114

Reassigned Medicare billing, Massachusetts enrollment
6,360 clinicians in this Medicare group

NPI 1801874573 (617) 724-0287

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 16

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.

Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes 99152

This procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.

101 services98 patients

Ultrasonic guidance for blood vessel access 76937

Ultrasonic guidance for blood vessel access is a medical procedure where sound waves are used to create images of your blood vessels. This helps doctors to accurately locate and access the vessels for treatments or tests, ensuring safety and precision.

57 services55 patients

Ultrasonic guidance for needle placement 76942

Ultrasonic guidance for needle placement is a technique where sound waves create images that help accurately position the needle during procedures. This method ensures precision, minimizes discomfort, and increases safety.

51 services51 patients

Fluoroscopic guidance for insertion or removal of central vein access device 77001

Fluoroscopic guidance for central vein access device insertion or removal is a procedure where a special X-ray, called a fluoroscope, is used to help accurately place or remove a device in a central vein. This device aids in delivering medications or collecting blood samples.

29 services29 patients

Needle biopsy of liver through skin 47000

A needle biopsy of the liver through skin is a procedure where a small tissue sample from your liver is collected using a thin needle. This is done to diagnose liver diseases or conditions. It involves inserting the needle through your skin and into your liver.

27 services25 patients

Review by radiologist of ct guidance for needle placement 77012

This process involves a radiologist examining CT scan images to accurately guide a needle's placement within the body. This technique is often used for biopsies or treatments, ensuring precision and safety.

27 services27 patients

Ct scan of blood vessels of abdomen and pelvis with contrast 74174

A CT scan of the abdomen and pelvis with contrast is a medical imaging procedure. A special dye, called contrast, is used to make blood vessels more visible. The scan produces detailed images of your abdomen and pelvis, helping doctors to diagnose conditions or plan treatments.

22 services22 patients

Needle biopsy of kidney 50200

A needle biopsy of the kidney is a medical procedure where a small sample of kidney tissue is removed using a special needle. This is done to examine the tissue under a microscope for any abnormalities. It helps in diagnosing potential kidney conditions.

21 services21 patients

Drainage of fluid collection of abdominal cavity by tube using imaging guidance 49406

This procedure involves the removal of excess fluid from the abdominal cavity using a tube. Imaging guidance, such as ultrasound or CT scan, is used to accurately place the tube and ensure the fluid is safely drained. This can help relieve discomfort and pressure.

18 services15 patients

Insertion of tunneled central venous tube for infusion (5 years or older) 36558

The insertion of a tunneled central venous tube is a procedure where a thin, flexible tube is placed into a large vein, usually in the neck or chest. This tube allows healthcare providers to give medications, fluids, or nutrients directly into your bloodstream over a longer period.

17 services17 patients

Core needle biopsy of lung or center cavity of chest (mediastinum), accessed through skin 32408

A core needle biopsy of the lung or mediastinum is a procedure where a small sample of tissue is collected using a needle inserted through the skin. This helps in diagnosing lung conditions or diseases in the chest's central cavity. It's a safe and minimally invasive process.

16 services16 patients

Insertion of tube into abdominal, pelvic, or leg artery, initial third order branch 36247

This procedure involves placing a tube into an artery in the abdomen, pelvis, or leg. The tube is inserted into the initial third order branch of the artery. This can help doctors diagnose or treat certain conditions by allowing access to these blood vessels.

15 services11 patients

Ct scan of blood vessels of chest with contrast 71275

A CT scan of the chest with contrast is a non-invasive imaging test. It uses X-rays and a special dye to get detailed images of your blood vessels in the chest. This helps in diagnosing conditions related to heart and lungs.

15 services15 patients

Review by radiologist of image for replacement of stomach or large bowel tube 75984

This procedure involves a radiologist examining images to assess the placement of a tube in your stomach or large bowel. The tube helps with digestion or removal of waste. The radiologist's review ensures the tube is correctly positioned for your safety and comfort.

15 services11 patients

Placement of device in prostate for radiation therapy 55876

This procedure involves placing a small device in the gland below the bladder to deliver radiation therapy. This helps target therapy directly to the concerned area, potentially reducing side effects and improving treatment effectiveness.

14 services14 patients

Needle biopsy of growth of abdominal cavity 49180

A needle biopsy of the abdominal cavity growth is a procedure where a thin needle is inserted into the abdomen to collect a small tissue sample from the growth. This sample is then examined under a microscope to identify the nature of the growth. It's a safe, minimally invasive procedure.

13 services13 patients

Hospital Affiliations CMS Care Compare 2

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02114 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.

KAITLYN MY-TU LAM MBBS

Internal Medicine (Cardiovascular Disease)

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 724-7738

ALAKA RAY M.D.

Internal Medicine

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2066

MEGHAN E SISE M.D.

Internal Medicine (Nephrology)

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2862

HUGH G AUCHINCLOSS M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery)

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2000

ANGELA M. JACQUES MD

Pediatrics

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.
BOSTON, MA 02114

Suffolk County (617) 726-2066

NICOLE J LOOK-HONG MD, MSC

Surgery (Surgical Oncology)

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.
BOSTON, MA 02114

Suffolk County (617) 724-3868

CORINNA M ELLIOTT MA

Student in an Organized Health Care Education/Training Program

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 724-5600

KIRAN J AGARWAL-HARDING MD

Orthopaedic Surgery

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.
BOSTON, MA 02114

Suffolk County (617) 726-2942

ADELINE GOSS MD

Internal Medicine

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.
BOSTON, MA 02114

Suffolk County (617) 643-0596

KENDRICK M SHAW MD, PHD

Anesthesiology

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.
BOSTON, MA 02114

Suffolk County (617) 726-3030

JOSHUA M SIEWERT MD,MBA

Internal Medicine

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.
BOSTON, MA 02114

Suffolk County (617) 643-0596

CRISTINA CUSIN MD

Psychiatry & Neurology (Psychiatry)

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2066

PARSIA A VAGEFI MD

Surgery

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2066

ANNE HODGES LIGHT MD

Pediatrics

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2066

DR. HILLARY R. KELLY MD

Radiology (Diagnostic Radiology)

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET, GRB-273A
BOSTON, MA 02114

Suffolk County (617) 726-8320

GARRETT M CHINN M.D.

Internal Medicine

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2862

RUTH A DELANEY MD

Orthopaedic Surgery

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2800

KELLY E IRWIN M.D.

Psychiatry & Neurology (Psychiatry)

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT STREET
BOSTON, MA 02114

Suffolk County (617) 726-2000

SHIRI B FEINGOLD M.D.

Internal Medicine

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.
BOSTON, MA 02114

Suffolk County (617) 726-2865

NILAY K PATEL MD

Internal Medicine

MASSACHUSETTS GENERAL HOSPITAL, 55 FRUIT ST.
BOSTON, MA 02114

Suffolk County (617) 726-2865

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 Thomas An's NPI number?

The NPI number for Thomas An is 1912427113. It was assigned to this individual provider in the NPPES registry on June 20, 2017.

Where is Thomas An located?

Thomas An practices at Massachusetts General Hospital 55 Fruit St., Boston, MA 02114. The listed phone number is (617) 726-5518.

What is Thomas An's specialty?

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

Is Thomas An enrolled in Medicare?

Yes. Thomas An 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 Thomas An's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Thomas An reassigns Medicare benefits to 2 organizations: The General Hospital Corporation (Boston, MA) and Massachusetts General Physicians Organization Inc (Boston, MA). 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 Thomas An's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Thomas An affiliated with any hospitals?

According to CMS data, Thomas An is affiliated with Massachusetts General Hospital and Newton-Wellesley Hospital.

When was this NPI record last updated?

The NPPES record for Thomas An was last updated on December 21, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.