Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Timothy A Johnson, MD

Individual provider Hematology & Oncology Physician · NPI 1801879762

Timothy A Johnson, MD practises Hematology/Oncology in Springfield, Massachusetts. Graduated from University of Connecticut School of Medicine in 1992, 34 years ago. Practices with Mercy Medical Group Inc, a 17-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
34
Trained at
University of Connecticut School of Medicine
Licensed in
MA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

271 Carew St
Springfield, MA 01104 Not confirmed with CMS for 12 years — call before visiting
Phone: (413) 748-7370
Fax: (413) 748-7221
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 220236 (MA)

Record details

NPI number1801879762
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 23, 2005
Last updated in NPPESApril 10, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolUNIVERSITY OF CONNECTICUT SCHOOL OF MEDICINE
Graduated 1992 (34 years in practice)
Group practice Mercy Medical Group Inc — 17 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients366
Services billed 945 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Mercy Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 17 clinicians in the practice; 12 are shown here.

Other providers in Springfield