Jonathan Kay, MD
NPI 1699766964 · Rheumatology Physician · Worcester, MA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathan Kay, MD is a Rheumatology Physician provider in Worcester, MA (NPI 1699766964).
Provider details
- NPI number
- 1699766964
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 55522 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
273 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 149 | $97 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 61 | $59 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 36 | $65 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 16 | $143 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 11 | $132 |
Typical Medicare-allowed amounts for these services range $59–$143 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 219 | 60 |
| Allopurinol | 98 | 22 |
| Adalimumabbrand: Humira(cf) Pen | 69 | — |
| Leucovorin Calcium | 61 | 14 |
| Tocilizumabbrand: Actemra Actpen | 37 | — |
| Naproxen | 37 | 17 |
| Prednisone | 28 | 13 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$6,315 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-04
- Last updated
- 2020-11-17
- Certified
- 2020-11-17
Frequently asked questions
- What is Jonathan Kay's NPI number?
- Jonathan Kay's National Provider Identifier (NPI) is 1699766964, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathan Kay's specialty?
- Jonathan Kay is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathan Kay located?
- Jonathan Kay's practice location on file with NPPES is 119 Belmont St, Worcester, MA 01605-2903.
- What is Jonathan Kay's phone number?
- The practice phone number listed in the NPPES registry for Jonathan Kay is (508) 793-6936.
- Does Jonathan Kay accept Medicare?
- Jonathan Kay is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathan Kay's NPI active?
- Yes — Jonathan Kay's NPI (1699766964) is active in the NPPES registry as of the last update on 2020-11-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.