Jonathan Kay, MD
Rheumatology Physician · Worcester, MA
Jonathan Kay, MD is a rheumatology physician with a practice address in Worcester, Massachusetts, and NPI 1699766964, issued on Nov 4, 2005. Check the license (Massachusetts 55522, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Jonathan Kay
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 55522 MA
Self-reported in NPPES; status is on the state search - Practice location
- 119 Belmont St, Worcester, MA 01605
- Phone
- (508) 793-6936
- Enumerated
- Nov 4, 2005
- Record last updated
- Nov 17, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 110046826A MA
- Medicare enrollment
- Enrolled (PECOS I20040819000439); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1983
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 343 in Massachusetts → Look up another NPI →
Also registered at 119 Belmont St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jonathan Kay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 55522Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average rheumatology physician in 2024
849 Medicare Part D claims for 133 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims.
Most prescribed
- Methotrexate219 claims
- Allopurinol98 claims
- Humira(Cf) Pen69 claims
- Leucovorin Calcium61 claims
- Actemra Actpen37 claims
- Naproxen37 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.
The MIPS final score for 2023 (Medicare payment program): 97 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $6,315.09
4 payments; by number, the most common kind was honoraria; the largest payer was Hexal AG. The 4,486 providers of this specialty with any payment received $8,538.33 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
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
- Umass Memorial Medical Group IncWorcester, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan Kay among 343 rheumatology physician records in Massachusetts
Jonathan Kay, MD is one of 343 rheumatology physician records with a practice address in Massachusetts. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1983 · median 2004 among the 212 with a school on file
- Record last updated2020 · 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 207RR0500X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Massachusetts
There are 343 rheumatology physician records in Massachusetts.
All 343 in Massachusetts → Every provider in Worcester → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Norman Bress, M.D.Worcester, MA 016051407828734
- Ratnesh Chopra, M.D.Worcester, MA 016051710944137
- Beata Cieslak-Skowronska, M.D.Worcester, MA 016051447226642
- Deborah Demarco, M.D.Worcester, MA 016051215910849
- Nancy Liu, M.D.Worcester, MA 016051265416531
- Evelyn Love, M.D.Worcester, MA 016051164538922
- Timothy McAlindon, MD, MPHWorcester, MA 016051518931625
- Raymond Pertusi, DOWorcester, MA 016051679536312
Common questions
What is Jonathan Kay, MD's NPI number?
Jonathan Kay, MD's National Provider Identifier (NPI) is 1699766964, issued on Nov 4, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan Kay, MD located?
The NPPES record lists a practice address at 119 Belmont St, Worcester, MA, 01605. Phone: (508) 793-6936. Providers update this record themselves, so call before visiting.
How can I verify Jonathan Kay, MD's license?
NPPES lists Massachusetts license number 55522, 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 Jonathan Kay, MD prescribe under Medicare Part D?
In 2024, Jonathan Kay, MD had 849 Medicare Part D claims for 133 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Jonathan Kay, MD's MIPS final score?
The 2023 MIPS final score is 97 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.
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.