Dr. Jonathan Kay, MD
Rheumatology (Rheumatology Physician)
119 Belmont St
Worcester, MA 01605
Who else practices at this address →
Worcester County includes primary care (3% of residents) and mental health (11% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- University of California, San Francisco School of Medicine (1983)
- Years since graduation
- 43
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 127
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1983Medical school: University of California, San Francisco School of Medicine
- 2005Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Rheumatology Physician primary
MA license 55522 -
Internal Medicine Physician
MA license 55522
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Umass Memorial Medical Center/university Campus Worcester, MA
- Umass Memorial Healthalliance Hospitals Leominster, MA
- Umass Memorial Health - Harrington Hospital Southbridge, MA
Medical groups
- Umass Memorial Medical Group Inc (2,516 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 127
- Services billed
- 297
- Patients’ average age
- 72
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 189 | 114 |
| Aspiration and/or injection of fluid from large joint | 50 | 24 |
| Established patient office or other outpatient visit, 20-29 minutes | 34 | 17 |
| New patient office or other outpatient visit, 45-59 minutes | 18 | 18 |
| Established patient office or other outpatient visit, 40-54 minutes | 15 | 12 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Methotrexate (methotrexate sodium) Other prescribers in Worcester, MA | 219 |
| Allopurinol Other prescribers in Worcester, MA | 98 |
| Humira(Cf) Pen (adalimumab) Other prescribers in Worcester, MA | 69 |
| Leucovorin Calcium | 61 |
| Naproxen Other prescribers in Worcester, MA | 37 |
| Actemra Actpen (tocilizumab) | 37 |
| Prednisone Other prescribers in Worcester, MA | 28 |
| Colchicine Other prescribers in Worcester, MA | 25 |
| Hydroxychloroquine Sulfate Other prescribers in Worcester, MA | 23 |
| Cosentyx Sensoready (2 Pens) (secukinumab) | 21 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 4 companies reported 8 payments worth $17,191 in total to this clinician.
| Samsung Bioepis Co., LTD. | $15,499 |
|---|---|
| Organon LLC | $1,390 |
| Novartis Pharmaceuticals Corporation | $178 |
| AstraZeneca Pharmaceuticals LP | $125 |
| Travel and Lodging | $10,995 |
|---|---|
| Speaking at a medical education program | $4,365 |
| Honoraria | $1,390 |
| Food and Beverage | $441 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Samsung Bioepis Co., LTD. Nov 6, 2025 | Travel and Lodging SB5 · Rheumatology · travel to Seoul, Korea (Republic of) Company’s descriptionSBE KLASS Symposium (Flight, Taxi) | $10,098 |
| Samsung Bioepis Co., LTD. Nov 6, 2025 | Speaking at a medical education program SB5 · Rheumatology Company’s descriptionSBE KLASS Symposium | $4,365 |
| Organon LLC Nov 14, 2025 | Honoraria | $1,390 |
| Samsung Bioepis Co., LTD. Nov 28, 2025 | Travel and Lodging SB5 · Rheumatology · travel to Seoul, Korea (Republic of) · in-kind Company’s descriptionSBE KLASS Symposium | $897 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.