NPPES file of Aug 9, 2026

Hematology & Oncology Physician in Massachusetts

461 NPPES records list hematology & oncology physician with a practice address in Massachusetts, 6.6 per 100,000 residents, the 3rd highest rate of 51. Boston and Worcester have the most; each record links to the provider's NPI and the Massachusetts license search. Page 10 of 10.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RH0003X · method

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

Boston has the most, 235

  1. Boston235
  2. Worcester46
  3. Springfield18
  4. Cambridge12
  5. Burlington9

Hematology & Oncology Physician records in Massachusetts

  1. Peter Yang, M.D.Danvers, MA 019231881846483
  2. Oladapo Yeku, M.D, PHDBoston, MA 021141477829489
  3. Wb Younger, MDBoston, MA 021141285615112
  4. Shakeeb Yunus, MDWorcester, MA 016081801883673
  5. Virginia Zaleskas, M.D.Boston, MA 021111538130133
  6. Jessica Zerillo, M.D.Boston, MA 022151982831400
  7. Rena Zheng, M.D., PH.D.Worcester, MA 016551497140958
  8. Ruifeng Zhou, M.D.Springfield, MA 011071376816736
  9. Viola Zhu, MD PHDWorcester, MA 016551588814404
  10. Harvey Zimbler, M.D.Pittsfield, MA 012011083686224
  11. Leonard Zon, MDBoston, MA 021151245299197

Source: CMS NPPES, primary taxonomy 207RH0003X: records by practice city and the list of records, file of Aug 9, 2026.

Massachusetts ranks 3 of 51 per resident

  1. District of Columbia11.9
  2. Rhode Island8.0
  3. Massachusetts6.6
  4. Washington6.1
  5. Pennsylvania6.0
  6. 50 states and D.C.4.2

Source: CMS NPPES, primary taxonomy 207RH0003X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

75.1% of these records appear in a Medicare file, against 82.9% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. Massachusetts75.1%
  2. United States82.9%

Hematology & Oncology Physician records in Massachusetts, measured

  • In a Medicare file346 of 461 · 75.1% here, 82.9% nationally
  • In the CMS Doctors and Clinicians file304 · 65.9% here, 71.3% nationally
  • Not updated in five years or more285 · 61.8% here, 54.3% nationally
  • Median graduation year2004 · the 303 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RH0003X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

461 NPPES records list hematology & oncology physician (207RH0003X) as their primary taxonomy with a practice address in Massachusetts: 6.6 per 100,000 residents against 4.2 nationally (50 states and D.C.). Boston has 235 of them (51%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Washington476
  2. North Carolina431
  3. Ohio513
  4. New Jersey399

States with a similar rate per 100,000

  1. Pennsylvania6.0
  2. New York5.9
  3. Maine5.5
  4. Connecticut5.5

The largest states

  1. California1,583
  2. New York1,163
  3. Texas922
  4. Florida818
  5. Pennsylvania784

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

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.