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Dr. Robert Ryn Johnson, MD

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Specializes in: Radiation Oncology
100 Casa Street Suite C
San Luis Obispo, CA 93405

Dr. Robert Ryn Johnson, MD is a radiation oncologist in San Luis Obispo, CA specializing in radiation oncology.

View Doctor's Full Profile (805) 541-1932

Office Locations

100 Casa Street Suite C
San Luis Obispo, CA 93405
(805) 541-1932
(805) 541-1653
open_in_new

Noteworthy Medicare Patient Procedures Performed by Dr. Robert Ryn Johnson, MD in 2024

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 10%

By Volume:

external beam radiation therapy
image guided procedures

In 2024, Dr. Robert Ryn Johnson, MD performed more external beam radiation therapy (EBRT), and image guided procedures procedures for Medicare patients than 90% of providers in related specialties within California.

Top 25%

By Volume:

stereotactic body radiation therapy

In 2012, Dr. Robert Ryn Johnson, MD performed more stereotactic body radiation therapy (SBRT) procedures for Medicare patients than 75% of providers in related specialties within California.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 174

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2013 were hospital care, inpatient care and radiation therapy.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 611
hospital care 27
inpatient care 27
radiation therapy 23

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 133
Female 45
Ethnicity
Non-Hispanic White 156
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 66
From 75 to 84 83
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2013

Hypertension 72
High Cholesterol 58
Stroke 7
Ischemic Heart Disease 51
Depression 15
Chronic Kidney Disease 36
Asthma 0
Osteoperosis 7
Atrial Fibrilation 16
Heart Failure 21
Chronic Obstructive Pulmonary Disease 20
Diabetes 28
Dementia 9
Cancer 75

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2014 were radiation therapy, hospital care and inpatient care.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 813
hospital care 15
inpatient care 15
radiation therapy 23

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 166
Female 73
Ethnicity
Non-Hispanic White 218
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 95
From 75 to 84 110
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2014

Hypertension 65
High Cholesterol 59
Stroke 8
Ischemic Heart Disease 45
Depression 19
Chronic Kidney Disease 30
Asthma 0
Osteoperosis 7
Atrial Fibrilation 17
Heart Failure 21
Chronic Obstructive Pulmonary Disease 21
Diabetes 25
Dementia 0
Cancer 72

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2015 were radiation therapy.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 823
radiation therapy 19

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 354
Female 176
Ethnicity
Non-Hispanic White 476
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 214
From 75 to 84 234
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2015

Hypertension 68
High Cholesterol 65
Stroke 8
Ischemic Heart Disease 43
Depression 21
Chronic Kidney Disease 34
Asthma 14
Osteoperosis 9
Atrial Fibrilation 17
Heart Failure 16
Chronic Obstructive Pulmonary Disease 22
Diabetes 24
Dementia 7
Cancer 71

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2016 were hospital care and inpatient care.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 769
hospital care 13
inpatient care 13

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 181
Female 80
Ethnicity
Non-Hispanic White 229
Black 0
Hispanic 19
Asian 0
Other 0
Native American 0
Age
From 65 to 74 101
From 75 to 84 108
85 and over 39
Less than 65 13

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2016

Hypertension 72
High Cholesterol 64
Stroke 6
Ischemic Heart Disease 49
Depression 18
Chronic Kidney Disease 33
Asthma 25
Osteoperosis 8
Atrial Fibrilation 20
Heart Failure 18
Chronic Obstructive Pulmonary Disease 24
Diabetes 28
Dementia 8
Cancer 71

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2017 were radiation therapy.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 736
radiation therapy 529

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 212
Female 188
Ethnicity
Non-Hispanic White 367
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 189
From 75 to 84 147
85 and over 43
Less than 65 21

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2017

Hypertension 60
High Cholesterol 44
Stroke 3
Ischemic Heart Disease 27
Depression 15
Chronic Kidney Disease 27
Asthma 7
Osteoperosis 10
Atrial Fibrilation 10
Heart Failure 14
Chronic Obstructive Pulmonary Disease 18
Diabetes 20
Dementia 4
Cancer 71

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2018 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 631
image guided procedures 54
radiation therapy 641

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 160
Female 182
Ethnicity
Non-Hispanic White 313
Black 0
Hispanic 16
Asian 0
Other 0
Native American 0
Age
From 65 to 74 157
From 75 to 84 130
85 and over 40
Less than 65 15

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2018

Hypertension 64
High Cholesterol 53
Stroke 5
Ischemic Heart Disease 27
Depression 18
Chronic Kidney Disease 26
Asthma 7
Osteoperosis 7
Atrial Fibrilation 13
Heart Failure 14
Chronic Obstructive Pulmonary Disease 14
Diabetes 22
Dementia 8
Cancer 70

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2019 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 661
image guided procedures 56
radiation therapy 960

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 177
Female 153
Ethnicity
Non-Hispanic White 286
Black 0
Hispanic 29
Asian 0
Other 0
Native American 0
Age
From 65 to 74 164
From 75 to 84 116
85 and over 33
Less than 65 17

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2019

Hypertension 64
High Cholesterol 56
Stroke 5
Ischemic Heart Disease 30
Depression 17
Chronic Kidney Disease 35
Asthma 5
Osteoperosis 8
Atrial Fibrilation 12
Heart Failure 12
Chronic Obstructive Pulmonary Disease 16
Diabetes 24
Dementia 8
Cancer 67

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2020 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 563
image guided procedures 74
radiation therapy 584

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 179
Female 170
Ethnicity
Non-Hispanic White 311
Black 0
Hispanic 23
Asian 0
Other 0
Native American 0
Age
From 65 to 74 183
From 75 to 84 115
85 and over 40
Less than 65 11

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2020

Hypertension 59
High Cholesterol 50
Stroke 5
Ischemic Heart Disease 25
Depression 16
Chronic Kidney Disease 30
Asthma 6
Osteoperosis 11
Atrial Fibrilation 12
Heart Failure 13
Chronic Obstructive Pulmonary Disease 16
Diabetes 21
Dementia 9
Cancer 70

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2021 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 742
image guided procedures 73
radiation therapy 929

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 178
Female 168
Ethnicity
Non-Hispanic White 312
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 167
From 75 to 84 124
85 and over 41
Less than 65 14

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2021

Hypertension 62
High Cholesterol 59
Stroke 4
Ischemic Heart Disease 27
Depression 17
Chronic Kidney Disease 26
Asthma 5
Osteoperosis 13
Atrial Fibrilation 10
Heart Failure 12
Chronic Obstructive Pulmonary Disease 11
Diabetes 23
Dementia 3
Cancer 70

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2022 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 593
image guided procedures 100
radiation therapy 611

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 185
Female 155
Ethnicity
Non-Hispanic White 292
Black 0
Hispanic 29
Asian 0
Other 0
Native American 0
Age
From 65 to 74 168
From 75 to 84 115
85 and over 42
Less than 65 15

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2022

Hypertension 71
High Cholesterol 66
Stroke 5
Ischemic Heart Disease 21
Depression 16
Chronic Kidney Disease 20
Asthma 6
Osteoperosis 16
Atrial Fibrilation 18
Heart Failure 10
Chronic Obstructive Pulmonary Disease 15
Diabetes 22
Dementia 0
Cancer 75

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2023 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 637
image guided procedures 72
radiation therapy 456

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 218
Female 158
Ethnicity
Non-Hispanic White 331
Black 0
Hispanic 24
Asian 0
Other 0
Native American 0
Age
From 65 to 74 182
From 75 to 84 133
85 and over 46
Less than 65 15

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2023

Hypertension 70
High Cholesterol 67
Stroke 7
Ischemic Heart Disease 19
Depression 15
Chronic Kidney Disease 19
Asthma 7
Osteoperosis 15
Atrial Fibrilation 20
Heart Failure 10
Chronic Obstructive Pulmonary Disease 17
Diabetes 19
Dementia 3
Cancer 73

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA during 2024 were radiation therapy and image guided procedures.

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

doctor visit 660
image guided procedures 103
radiation therapy 829

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 201
Female 169
Ethnicity
Non-Hispanic White 335
Black 0
Hispanic 16
Asian 0
Other 0
Native American 0
Age
From 65 to 74 165
From 75 to 84 154
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD in 2024

Hypertension 69
High Cholesterol 72
Stroke 5
Ischemic Heart Disease 20
Depression 17
Chronic Kidney Disease 21
Asthma 8
Osteoperosis 14
Atrial Fibrilation 19
Heart Failure 9
Chronic Obstructive Pulmonary Disease 16
Diabetes 16
Dementia 0
Cancer 65

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Robert Ryn Johnson, MD for Medicare patients.

The highest averages for the top procedures that Dr. Robert Ryn Johnson, MD treated as a radiation oncologist in San Luis Obispo, CA were radiation therapy, image guided procedures, hospital care and inpatient care.

doctor visit 647
hospital care 18
image guided procedures 76
inpatient care 18
radiation therapy 509

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Robert Ryn Johnson, MD.

Gender
Male 180
Female 132
Ethnicity
Black / African American 0
Asian / Pacific Islander 0
Non-Hispanic White 278
Hispanic 12
Native American / Alaskan Native 0
Other 0
Age
75 to 84 120
85 and over 24
Less than 65 9
65 to 74 142

Average of Total of Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Robert Ryn Johnson, MD treated were cancer, hypertension, high cholesterol and ischemic heart disease.

Hypertension 61
High Cholesterol 54
Stroke 5
Ischemic Heart Disease 29
Depression 15
Chronic Kidney Disease 25
Asthma 6
Osteoporosis 9
Heart Failure 13
Chronic Obstructive Pulmonary Disease 16
Diabetes 20
Atrial Fibrillation 14
Cancer 65
Dementia 4

Education & Training

He has a state license in California.

Licensed In: California

Ratings & Reviews

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General Payments

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

Payments by Company
Pfizer Inc. $224 INLYTA
$115 		SUTENT
$109
Zap Surgical Systems, Inc. $173 Zap-X
$173
Lilly USA, LLC $140 CYRAMZA
$140
E.R. Squibb & Sons, L.L.C. $131 OPDIVO
$131
Boehringer Ingelheim Pharmaceuticals, Inc. $129 Gilotrif
$129
Other $837 Neulasta
$122 		ZYKADIA
$115 		KEYTRUDA
$100 		Istodax
$98 		Avastin
$95 		Other
$307
Types of Payments
Food and Beverage $1,624
Education $10

Biography

Dr. Robert Johnson's specialty is radiation oncology. Dr. Johnson obtained his medical school training at the University of Cincinnati College of Medicine and performed his residency at a hospital affiliated with the University of Louisville. He speaks Spanish. He is affiliated with Dignity Health. He is not accepting new patients at this time according to Dignity Health.

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