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Dr. Robert Ryn Johnson, MD

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Specializes in: Radiation Oncology

University of Cincinnati College of Medicine

100 Casa Street Suite C
San Luis Obispo, CA 93405

(805) 541-1932

Dr. Robert Ryn Johnson, MD is a radiation oncologist in San Luis Obispo, CA specializing in radiation oncology. He graduated from University of Cincinnati College of Medicine. Dr. Robert Ryn Johnson, MD is affiliated with Dignity Health and French Hospital Medical Center Marian Regional/Arroyo Grande.

Office Locations

French Hospital Medical Center Marian Regional/Arroyo Grande

100 Casa Street Suite C
San Luis Obispo, CA 93405

(805) 541-1932

(805) 541-1653

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Noteworthy Medicare Patient Procedures Performed by Dr. Robert Ryn Johnson, MD in 2023

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

Top 10%

By Affordability:

conventional external beam radiation therapy

stereotactic radiosurgery

In 2023, Dr. Robert Ryn Johnson, MD had a list price for conventional external beam radiation therapy, and stereotactic radiosurgery (SRS) that was lower than the list prices billed to Medicare by 90% of providers in related specialties within California. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 25%

By Volume:

image guided procedures

radiation therapy

By Affordability:

stereotactic body radiation therapy

In 2012, among providers in related specialties within California, Dr. Robert Ryn Johnson, MD performed more image guided procedures, and radiation therapy procedures for Medicare patients than 75% of them and he also had a list price for stereotactic body radiation therapy (SBRT) that was lower than the list prices billed to Medicare by 75% of them. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

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

Average Medicare Procedure Volume From 2012 - 2022

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	646
hospital care	18
image guided procedures	71
inpatient care	18
radiation therapy	479

Average Medicare Patient Data From 2012 - 2022

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

**Gender**
Female	126
Male	175

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	269
Hispanic	10
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	25
75 to 84	116
Less than 65	9
65 to 74	136

Average of Total of Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD From 2012 - 2022

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	59
High Cholesterol	52
Stroke	5
Ischemic Heart Disease	31
Depression	15
Chronic Kidney Disease	27
Asthma	6
Osteoporosis	8
Heart Failure	13
Chronic Obstructive Pulmonary Disease	16
Diabetes	21
Atrial Fibrillation	13
Dementia	5
Cancer	64

Education & Training

Dr. Robert Ryn Johnson, MD graduated from University of Cincinnati College of Medicine. He completed residency at University of Louisville Affiliated Hospitals. He is certified by the Radiology Diagnostic Radiology and has a state license in California.

Medical School: University of Cincinnati College of Medicine

Residency: University of Louisville Affiliated Hospitals

Board Certification: Radiology Diagnostic Radiology

Licensed In: California

Affiliations & Hospitals

Dr. Robert Ryn Johnson, MD is associated with these hospitals and organizations:

Dignity Health

French Hospital Medical Center Marian Regional/Arroyo Grande

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 is a physician who specializes in radiation oncology. Dr. Johnson's education and training includes medical school at the University of Cincinnati College of Medicine and residency at a hospital affiliated with the University of Louisville. He is conversant in Spanish. He is affiliated with Dignity Health. Unfortunately, according to Dignity Health, Dr. Johnson is not currently accepting new patients.

Select Year:

Dr. Robert Ryn Johnson, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Robert Ryn Johnson, MD in 2023

By Affordability:

By Volume:

By Affordability:

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

2013 Medicare Patient Data

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

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

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

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

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

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

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

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

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

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

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

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

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

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

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

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

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

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

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

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Average Medicare Patient Data From 2012 - 2022

Average of Total of Conditions of Medicare patients treated by Dr. Robert Ryn Johnson, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

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