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Joseph R. Duffy Jr., PhD, SLP

(No ratings)

Specializes in: Speech Therapy
200 1st Street Sw
Rochester, MN 55905

Joseph R. Duffy Jr., PhD, SLP is a speech therapist in Rochester, MN specializing in speech therapy. Joseph R. Duffy Jr., PhD, SLP is affiliated with Mayo Clinic.

View Provider's Full Profile (507) 284-2511

Office Locations

200 1st Street Sw
Rochester, MN 55905
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Rochester, MN
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In The News 

“Treatment "is still a big black box," said Dr. Joseph Duffy of the Mayo Clinic in Rochester, Minn., where 67 patients with the syndrome have been treated.”—"MEDICINE / RESEARCH : Physicians Struggle to Find Cure for Tryptophan Illness", Los Angeles Times, April 2025
“Just to speak requires activating 100 muscles between the lungs and lips to produce at least 14 distinct sounds per second, said Dr. Joseph Duffy of the Mayo Clinic.”—"Mystery brain disorder robs patients of their words", Associated Press News, February 2016
“"Early symptoms are usually very subtle, and patients may be the only ones aware of the problem because they have to work harder to communicate, even though they may not make obvious errors," said...”—"The thief that robs the brain of language", Sarasota Herald-Tribune, May 2011

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN during 2012 were diagnostic evaluation.

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

diagnostic evaluation 195

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN during 2013 were diagnostic evaluation.

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

diagnostic evaluation 194

2013 Medicare Patient Data

Information about Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP.

Gender
Male 77
Female 106
Ethnicity
Non-Hispanic White 172
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 87
From 75 to 84 65
85 and over 13
Less than 65 18

Conditions of Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP in 2013

Hypertension 55
High Cholesterol 44
Stroke 10
Ischemic Heart Disease 26
Depression 25
Chronic Kidney Disease 14
Asthma 9
Osteoperosis 9
Atrial Fibrilation 8
Heart Failure 13
Chronic Obstructive Pulmonary Disease 7
Diabetes 24
Dementia 16
Cancer 10

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN during 2014 were diagnostic evaluation.

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

diagnostic evaluation 216

2014 Medicare Patient Data

Information about Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP.

Gender
Male 48
Female 59
Age
From 65 to 74 55
From 75 to 84 22
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP in 2014

Hypertension 48
High Cholesterol 37
Stroke 0
Ischemic Heart Disease 24
Depression 25
Chronic Kidney Disease 0
Asthma 0
Osteoperosis 0
Atrial Fibrilation 0
Heart Failure 0
Chronic Obstructive Pulmonary Disease 0
Diabetes 10
Dementia 13
Cancer 0

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN during 2015 were diagnostic evaluation.

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

diagnostic evaluation 128

2015 Medicare Patient Data

Information about Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP.

Gender
Male 80
Female 60
Age
From 65 to 74 70
From 75 to 84 48
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP in 2015

Hypertension 53
High Cholesterol 49
Stroke 17
Ischemic Heart Disease 29
Depression 21
Chronic Kidney Disease 0
Asthma 0
Osteoperosis 0
Atrial Fibrilation 0
Heart Failure 0
Chronic Obstructive Pulmonary Disease 0
Diabetes 19
Dementia 39
Cancer 0

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN during 2016 were diagnostic evaluation.

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

diagnostic evaluation 194

2016 Medicare Patient Data

Information about Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP.

Gender
Male 45
Female 53
Age
From 65 to 74 52
From 75 to 84 23
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP in 2016

Hypertension 46
High Cholesterol 38
Stroke 0
Ischemic Heart Disease 29
Depression 23
Chronic Kidney Disease 14
Asthma 0
Osteoperosis 0
Atrial Fibrilation 0
Heart Failure 0
Chronic Obstructive Pulmonary Disease 0
Diabetes 13
Dementia 19
Cancer 0

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN during 2017 were diagnostic evaluation.

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

diagnostic evaluation 188

2017 Medicare Patient Data

Information about Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP.

Gender
Male 46
Female 46
Age
From 65 to 74 45
From 75 to 84 30
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP in 2017

Hypertension 49
High Cholesterol 39
Stroke 12
Ischemic Heart Disease 24
Depression 32
Chronic Kidney Disease 15
Asthma 0
Osteoperosis 0
Atrial Fibrilation 0
Heart Failure 0
Chronic Obstructive Pulmonary Disease 12
Diabetes 20
Dementia 25
Cancer 0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN during 2018 were diagnostic evaluation.

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

diagnostic evaluation 176

2018 Medicare Patient Data

Information about Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP.

Gender
Male 44
Female 44
Age
From 65 to 74 60
From 75 to 84 0
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP in 2018

Hypertension 49
High Cholesterol 44
Stroke 0
Ischemic Heart Disease 23
Depression 25
Chronic Kidney Disease 17
Asthma 0
Osteoperosis 0
Atrial Fibrilation 0
Heart Failure 0
Chronic Obstructive Pulmonary Disease 0
Diabetes 17
Dementia 33
Cancer 0

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN during 2019 were diagnostic evaluation.

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

diagnostic evaluation 216

2019 Medicare Patient Data

Information about Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP.

Gender
Male 62
Female 45
Age
From 65 to 74 58
From 75 to 84 33
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP in 2019

Hypertension 50
High Cholesterol 44
Stroke 10
Ischemic Heart Disease 28
Depression 32
Chronic Kidney Disease 20
Asthma 0
Osteoperosis 0
Atrial Fibrilation 0
Heart Failure 13
Chronic Obstructive Pulmonary Disease 10
Diabetes 17
Dementia 35
Cancer 0

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2019

Volume of procedures performed by Joseph R. Duffy Jr., PhD, SLP for Medicare patients.

The highest averages for the top procedures that Joseph R. Duffy Jr., PhD, SLP treated as a speech therapist in Rochester, MN were diagnostic evaluation.

diagnostic evaluation 188

Average Medicare Patient Data From 2012 - 2019

Information about Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP.

Gender
Female 51
Male 50
Ethnicity
Black / African American 0
Asian / Pacific Islander 0
Non-Hispanic White 21
Hispanic 0
Native American / Alaskan Native 0
Other 0
Age
85 and over 1
75 to 84 27
Less than 65 2
65 to 74 53

Average of Total of Conditions of Medicare patients treated by Joseph R. Duffy Jr., PhD, SLP From 2012 - 2019

The highest averages of the most common conditions of Medicare patients that Joseph R. Duffy Jr., PhD, SLP treated were hypertension, high cholesterol, dementia and depression.

Hypertension 43
High Cholesterol 36
Stroke 6
Ischemic Heart Disease 22
Depression 22
Chronic Kidney Disease 10
Asthma 1
Osteoporosis 1
Heart Failure 3
Chronic Obstructive Pulmonary Disease 3
Diabetes 15
Atrial Fibrillation 1
Dementia 22
Cancer 1

Education & Training

He completed residency at Mayo Clinic. He has a state license in Minnesota.

Residency: Mayo Clinic (1975)

Licensed In: Minnesota

Affiliations & Hospitals

Joseph R. Duffy Jr., PhD, SLP is associated with these hospitals and organizations:

Mayo Clinic

Ratings & Reviews

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Biography

Dr. Joseph Duffy practices speech therapy in Rochester, MN. For his professional training, Dr. Duffy completed a residency program at Mayo Clinic. His distinctions include: Kawana Award for Lifetime Achievement in Publications - American Speech-Language-Hearing Association; Outstanding Alumnus Award - Montclair State University; and Excellence in Teaching Recognition - Mayo Clinic in Rochester. He is affiliated with Mayo Clinic.

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