NPPES file of Aug 9, 2026

Eddy J. Chen, M.D.

Hematology & Oncology Physician · Concord, MA

Eddy J. Chen, M.D. is a hematology & oncology physician with a practice address in Concord, Massachusetts, and NPI 1730376898, issued on Oct 2, 2007. Check the license (Massachusetts 234111, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1730376898
Name
Eddy J. Chen
Credential
M.D.
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License number
234111 MA
Self-reported in NPPES; status is on the state search
Practice location
133 Old Road TO 9 Acre Cor, Concord, MA 01742
Phone
(978) 287-3436
Enumerated
Oct 2, 2007
Record last updated
Jun 23, 2016 (not updated in 10 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20080505000196); accepts Medicare assignment
Medical or professional school
University Of Southern California Keck School Of Medicine, 2005
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest hematology & oncology physician records → All 461 in Massachusetts → Look up another NPI →

Also registered at 133 Old Road TO 9 Acre Cor

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Marie Aguirre, PA-CPhysician Assistant1467281691
  2. Michelle Allanbrook, RNRegistered Nurse1053833905
  3. David Barash, M.D.Emergency Medicine Physician1699756296
  4. Joseph Bergen, D.O.Emergency Medicine Physician1518921972
  5. Seamus Bergen, RNPsychiatric/Mental Health Registered Nurse1528638467
  6. Tanya Bergen, LICSWMental Health Counselor1861742140

Verify Eddy J. Chen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
    Search for license 234111    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Massachusetts license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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18% more Medicare Part D claims than the average hematology & oncology physician in 2024

1,036 Medicare Part D claims for 130 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 62 claims were for opioids.

  1. Eddy Chen1,036
  2. Specialty average877

Most prescribed

  1. Prednisone260 claims
  2. Abiraterone Acetate239 claims
  3. Bicalutamide57 claims
  4. Ondansetron Hcl46 claims
  5. Oxycodone Hcl37 claims
  6. Eliquis34 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $16.75

1 payment: food and beverage; the largest payer was E.R. Squibb & Sons, L.L.C. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Eddy Chen$16.75
  2. Specialty average$7,481.41

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Massachusetts General Physicians Organization IncBoston, MA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Eddy J. Chen among 461 hematology & oncology physician records in Massachusetts

Eddy J. Chen, M.D. is one of 461 hematology & oncology physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 50% of them.

  • NPI issued2007 · 50% of these records are older, 39% newer
  • In a Medicare fileYes · 75% of these records are
  • In the CMS Doctors and Clinicians fileYes · 66% of these records are
  • Graduated2005 · median 2004 among the 303 with a school on file
  • Record last updated2016 · 62% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Hematology & Oncology Physician providers in Massachusetts

There are 461 hematology & oncology physician records in Massachusetts.

All 461 in Massachusetts → Every provider in Concord → Hematology & Oncology Physician nationwide →

The 8 hematology & oncology physician records with the nearest ZIP codes

  1. Jon Dubois, M.D.Concord, MA 017421922080241
  2. Ewa Niemierko, M.D.Concord, MA 017421447233549
  3. Susan Sajer, M.D.Concord, MA 017421154304251
  4. Susan Donohue, M.D.Marlborough, MA 017521063493302
  5. Mona Kaddis, M.D.Milford, MA 017571003853680
  6. Daniel Roberts, M.D.Milford, MA 017571710240171
  7. Humberto Rossi, M.D.Milford, MA 017571245213347
  8. Natalie SinclairMilford, MA 017571740315654

Common questions

What is Eddy J. Chen, M.D.'s NPI number?

Eddy J. Chen, M.D.'s National Provider Identifier (NPI) is 1730376898, issued on Oct 2, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Eddy J. Chen, M.D. located?

The NPPES record lists a practice address at 133 Old Road TO 9 Acre Cor, Concord, MA, 01742. Phone: (978) 287-3436. Providers update this record themselves, so call before visiting.

How can I verify Eddy J. Chen, M.D.'s license?

NPPES lists Massachusetts license number 234111, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Eddy J. Chen, M.D. prescribe under Medicare Part D?

In 2024, Eddy J. Chen, M.D. had 1,036 Medicare Part D claims for 130 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.