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Dr. Jonathan Kay, MD

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Specializes in: Adult Rheumatology

University of California, San Francisco (UCSF), School of Medicine (1983)

Professional interests include: psoriatic arthritis, polymyalgia rheumatica (PMR), inflammatory arthritis, and more.

119 Belmont Street
Worcester, MA 01605

(508) 334-6481

Dr. Jonathan Kay, MD is a rheumatologist in Worcester, MA specializing in adult rheumatology. He graduated from University of California, San Francisco (UCSF), School of Medicine in 1983 and has 43 years of experience. Dr. Jonathan Kay, MD is affiliated with UMass Memorial Medical Center and UMass Memorial Health.

Office Locations

119 Belmont Street
Worcester, MA 01605

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In The News (see more mentions in the news)

“In 2017, at the American College of Rheumatology's annual meeting, Roy Fleischmann, MD, of the University of Texas Southwestern Medical Center in Dallas, squared off against Jonathan Kay, MD, of...”—"Turns Out That Biosimilars Do Impact Biologic Drug Costs", MedPage Today, December 2024

“During the Sunday debate, the "pro-switch" speaker, Jonathan Kay, MD, of the University of Massachusetts Medical School in Worcester, noted that painful and swollen joint counts illustrate the...”—"Mixed Results in Studies of Biosimilar-Originator Switching", MedPage Today, November 2017

“"The old regimen would have the same benefit without the risk of heart disease," said Dr. Jonathan Kay, an associate clinical professor of medicine at Harvard Medical School.”—"PATIENTS MAY GO BACK TO STANDBYS FOR PAIN", Orlando Sentinel, December 2004

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2012 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	83
doctor visit	380
injections	83

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2013 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	125
doctor visit	433
injections	125

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	78
Female	116

**Ethnicity**
Non-Hispanic White	169
Black	0
Hispanic	12
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	95
From 75 to 84	42
85 and over	17
Less than 65	40

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2013

Hypertension	67
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	30
Depression	26
Chronic Kidney Disease	28
Asthma	13
Osteoperosis	12
Atrial Fibrilation	13
Heart Failure	15
Chronic Obstructive Pulmonary Disease	10
Diabetes	32
Dementia	6
Cancer	7

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2014 were aspiration, injections, hospital care and inpatient care.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	112
doctor visit	456
hospital care	16
injections	112
inpatient care	16

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	87
Female	151

**Ethnicity**
Non-Hispanic White	202
Black	0
Hispanic	21
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	105
From 75 to 84	64
85 and over	19
Less than 65	50

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2014

Hypertension	73
High Cholesterol	60
Stroke	6
Ischemic Heart Disease	30
Depression	31
Chronic Kidney Disease	32
Asthma	13
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	19
Chronic Obstructive Pulmonary Disease	12
Diabetes	39
Dementia	7
Cancer	8

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2015 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	87
doctor visit	446
injections	87

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	178
Female	234

**Ethnicity**
Non-Hispanic White	364
Black	0
Hispanic	26
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	178
From 75 to 84	120
85 and over	46
Less than 65	68

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2015

Hypertension	75
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	35
Depression	31
Chronic Kidney Disease	35
Asthma	17
Osteoperosis	16
Atrial Fibrilation	13
Heart Failure	18
Chronic Obstructive Pulmonary Disease	14
Diabetes	39
Dementia	7
Cancer	11

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2016 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	83
doctor visit	397
injections	83

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	78
Female	124

**Ethnicity**
Non-Hispanic White	170
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	91
From 75 to 84	51
85 and over	18
Less than 65	42

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2016

Hypertension	70
High Cholesterol	53
Stroke	5
Ischemic Heart Disease	31
Depression	30
Chronic Kidney Disease	29
Asthma	23
Osteoperosis	13
Atrial Fibrilation	10
Heart Failure	15
Chronic Obstructive Pulmonary Disease	17
Diabetes	32
Dementia	0
Cancer	5

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2017 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	79
doctor visit	376
injections	79

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	73
Female	124

**Ethnicity**
Non-Hispanic White	176
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	80
From 75 to 84	63
85 and over	21
Less than 65	33

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2017

Hypertension	72
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	29
Depression	29
Chronic Kidney Disease	27
Asthma	13
Osteoperosis	16
Atrial Fibrilation	9
Heart Failure	12
Chronic Obstructive Pulmonary Disease	12
Diabetes	30
Dementia	6
Cancer	8

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2018 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	79
doctor visit	390
injections	79

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	72
Female	100

**Ethnicity**
Non-Hispanic White	152
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	60
From 75 to 84	64
85 and over	17
Less than 65	31

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2018

Hypertension	72
High Cholesterol	53
Stroke	0
Ischemic Heart Disease	30
Depression	26
Chronic Kidney Disease	23
Asthma	11
Osteoperosis	14
Atrial Fibrilation	12
Heart Failure	15
Chronic Obstructive Pulmonary Disease	8
Diabetes	28
Dementia	7
Cancer	12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2019 were aspiration, injections, hospital care and inpatient care.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	79
doctor visit	410
hospital care	11
injections	79
inpatient care	11

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	90
Female	127

**Ethnicity**
Non-Hispanic White	186
Black	0
Hispanic	13
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	68
85 and over	20
Less than 65	53

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2019

Hypertension	71
High Cholesterol	51
Stroke	0
Ischemic Heart Disease	29
Depression	31
Chronic Kidney Disease	30
Asthma	9
Osteoperosis	11
Atrial Fibrilation	11
Heart Failure	17
Chronic Obstructive Pulmonary Disease	12
Diabetes	25
Dementia	9
Cancer	9

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2020 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	62
doctor visit	311
injections	62

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	81
Female	101

**Ethnicity**
Non-Hispanic White	153
Black	0
Hispanic	13
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	75
From 75 to 84	55
85 and over	19
Less than 65	33

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2020

Hypertension	64
High Cholesterol	53
Stroke	6
Ischemic Heart Disease	29
Depression	25
Chronic Kidney Disease	29
Asthma	11
Osteoperosis	11
Atrial Fibrilation	10
Heart Failure	14
Chronic Obstructive Pulmonary Disease	13
Diabetes	30
Dementia	6
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2021 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	70
doctor visit	367
injections	70

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	78
Female	117

**Ethnicity**
Non-Hispanic White	168
Black	0
Hispanic	15
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	86
From 75 to 84	60
85 and over	17
Less than 65	32

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2021

Hypertension	64
High Cholesterol	58
Stroke	6
Ischemic Heart Disease	26
Depression	33
Chronic Kidney Disease	31
Asthma	13
Osteoperosis	15
Atrial Fibrilation	9
Heart Failure	15
Chronic Obstructive Pulmonary Disease	15
Diabetes	26
Dementia	8
Cancer	9

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA during 2022 were aspiration and injections.

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

aspiration	68
doctor visit	321
injections	68

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	72
Female	86

**Ethnicity**
Non-Hispanic White	138
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	63
From 75 to 84	54
85 and over	19
Less than 65	22

Conditions of Medicare patients treated by Dr. Jonathan Kay, MD in 2022

Hypertension	75
High Cholesterol	72
Stroke	8
Ischemic Heart Disease	25
Depression	22
Chronic Kidney Disease	27
Asthma	13
Osteoperosis	16
Atrial Fibrilation	16
Heart Failure	13
Chronic Obstructive Pulmonary Disease	18
Diabetes	25
Dementia	0
Cancer	19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Jonathan Kay, MD for Medicare patients.

The highest averages for the top procedures that Dr. Jonathan Kay, MD treated as a rheumatologist in Worcester, MA were aspiration, injections, hospital care and inpatient care.

aspiration	84
doctor visit	389
hospital care	13
injections	84
inpatient care	13

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Jonathan Kay, MD.

**Gender**
Male	80
Female	116

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	170
Native American / Alaskan Native	0
Hispanic	9
Other	0

**Age**
75 to 84	58
85 and over	19
Less than 65	36
65 to 74	82

Average of Total of Conditions of Medicare patients treated by Dr. Jonathan Kay, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Jonathan Kay, MD treated were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	63
High Cholesterol	50
Stroke	2
Ischemic Heart Disease	26
Depression	25
Chronic Kidney Disease	26
Asthma	12
Osteoporosis	12
Heart Failure	13
Chronic Obstructive Pulmonary Disease	11
Diabetes	27
Atrial Fibrillation	10
Dementia	5
Cancer	9

Education & Training

Dr. Jonathan Kay, MD graduated from University of California, San Francisco (UCSF), School of Medicine in 1983. He completed residency at Hospital of the University of Pennsylvania. He is certified by the Board Certification: Internal Medicine and has a state license in Massachusetts.

Medical School: University of California, San Francisco (UCSF), School of Medicine (1983)

Residency: Hospital of the University of Pennsylvania

Board Certification: Board Certification: Internal Medicine

Licensed In: Massachusetts

Affiliations & Hospitals

Dr. Jonathan Kay, MD is associated with these hospitals and organizations:

UMass Memorial Medical Center

UMass Memorial Health

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General Payments

These charts describe general payments received by Dr. Jonathan Kay, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Pfizer Inc.	$87,049 XELJANZ $13,272	INFLECTRA $5,500	NonCovered Product $4,858	ABRILADA $3,000	Non-Covered Product $1,498	Other $58,921
Sandoz Inc.	$81,595 ERELZI $16,795	Adalimumab $8,442	Hyrimoz $2,100	$54,258
Amgen Inc.	$58,680 Prolia $3,623	Enbrel $2,634	$52,423
Merck Sharp & Dohme Corporation	$53,059 NON-PRODUCT $11,011	KEYTRUDA $527	$41,520
Novartis Pharmaceuticals Corporation	$38,154 COSENTYX $38,154
Other	$295,655 Actemra $23,987	Cimzia $22,485	ORENCIA $18,658	KRYSTEXXA $11,885	INFLECTRA $11,800	Other $206,842

**Types of Payments**
Consulting Fee	$443,744
Travel and Lodging	$78,096
Honoraria	$43,199
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$31,619
Food and Beverage	$17,259
Other	$274

Research Payments

Dr. Jonathan Kay, MD has received 126 research payments totaling $544,161.

Biography

Dr. Jonathan Kay is an adult rheumatology specialist in Worcester, MA. Areas of particular interest for Dr. Kay include polymyalgia rheumatica (PMR), psoriatic arthritis, and rheumatoid arthritis. He is affiliated with UMass Memorial Medical Center. Dr. Kay has an open panel in Worcester, MA according to Doctor.com. He graduated from the University of California, San Francisco (UCSF), School of Medicine and then he performed his residency at Hospital of the University of Pennsylvania. He is conversant in French.