NPPES file of Aug 9, 2026

Wilson C. Mertens, M.D.

Medical Oncology Physician · Springfield, MA

Wilson C. Mertens, M.D. is a medical oncology physician with a practice address in Springfield, Massachusetts, and NPI 1427016484, issued on May 1, 2006. Check the license (Massachusetts 203709, 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
1427016484
Name
Wilson C. Mertens
Credential
M.D.
Primary taxonomy
Medical Oncology Physician 207RX0202X
License number
203709 MA
Self-reported in NPPES; status is on the state search
Practice location
3350 Main St, Springfield, MA 01107
Phone
(413) 794-9338
Enumerated
May 1, 2006
Record last updated
Nov 14, 2016 (not updated in 10 years: call before relying on the address or phone)
Fax
(413) 794-9754
Medicare enrollment
Enrolled (PECOS I20040913000103); accepts Medicare assignment
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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Also registered at 3350 Main St

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

  1. Brian Acker, M.D.Specialist1619077369
  2. Syed Ali, MDMedical Oncology Physician1174751267
  3. Jennifer Alli, DNP FNP-BCFamily Nurse Practitioner1255764890
  4. Janivette Alsina, MD, PHDSurgical Oncology Physician1477758043
  5. Armen Asik, M.DMedical Oncology Physician1326066200
  6. Prarthna Bhardwaj, MDHematology & Oncology Physician1487007225

Verify Wilson C. Mertens 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 203709    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

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85% fewer Medicare Part D claims than the average medical oncology physician in 2024

104 Medicare Part D claims for 30 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims.

  1. Wilson Mertens104
  2. Specialty average703

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.

Bills Medicare through one group practice

  1. Baystate Medical Practices IncSpringfield, MA

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

Medical Oncology Physician providers in Massachusetts

There are 421 medical oncology physician records in Massachusetts.

All 421 in Massachusetts → Every provider in Springfield →

Other medical oncology physician records in Massachusetts

  1. Janet Abrahm, MDBoston, MA1427024264
  2. Thomas Abrams, M.D.Boston, MA1184693947
  3. Jeremy Abramson, MDBoston, MA1740262484
  4. Nana Addo-Tabiri, MDBoston, MA1942557079
  5. Adeboye Adewoye, M.D.Boston, MA1316920838
  6. Andrew Aguirre, MD, PHDBoston, MA1609071208
  7. Inhye Ahn, M.D.Boston, MA1053632984
  8. Jean Joseph Thierry AlcindorBoston, MA1578281796
  9. Syed Ali, MDSpringfield, MA1174751267
  10. Jill Allen, M.D.Boston, MA1285671453

Common questions

What is Wilson C. Mertens, M.D.'s NPI number?

Wilson C. Mertens, M.D.'s National Provider Identifier (NPI) is 1427016484, issued on May 1, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Wilson C. Mertens, M.D. located?

The NPPES record lists a practice address at 3350 Main St, Springfield, MA, 01107. Phone: (413) 794-9338. Providers update this record themselves, so call before visiting.

How can I verify Wilson C. Mertens, M.D.'s license?

NPPES lists Massachusetts license number 203709, 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 Wilson C. Mertens, M.D. prescribe under Medicare Part D?

In 2024, Wilson C. Mertens, M.D. had 104 Medicare Part D claims for 30 beneficiaries; the average among medical oncology physician prescribers was 703. 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.