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Dr. William Rayford Gwin III, MD

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Specializes in: Medical Oncology and Adult Oncology

University of Alabama at Birmingham School of Medicine

Professional interests include: breast cancer

1354 Aloha Street Sloan Clinic 1
Seattle, WA 98109

(206) 744-5100

Dr. William Rayford Gwin III, MD is a medical oncologist in Seattle, WA specializing in medical oncology and adult oncology. He graduated from University of Alabama at Birmingham School of Medicine. Dr. William Rayford Gwin III, MD is affiliated with Fred Hutchinson Cancer Center and THE ASSOCIATION OF UNIVERSITY PHYSICIANS.

Office Locations

1354 Aloha Street Sloan Clinic 1
Seattle, WA 98109

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325 9th Avenue
Seattle, WA 98104

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In The News

“She received world class care from Dr. William Rayford Gwin III and his extended team at the Seattle Cancer Care Alliance (now the Fred Hutchinson Cancer Center) as well as from the University of...”—"Corey Elizabeth Brennan Obituary - Seattle, WA (1986-2025)", Mercury News, March 2025

“Kathleen Jade is examined by Dr. Will Gwin before receiving her third dose of an experimental breast cancer vaccine at University of Washington Medical Center - Montlake, Tuesday, May 30, 2023, in...”—"The next big advance in cancer treatment could be a vaccine", Associated Press News, June 2023

Noteworthy Medicare Patient Procedures Performed by Dr. William Rayford Gwin III, MD in 2023

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

Top 25%

By Volume:

inpatient hospital care

In 2013, Dr. William Rayford Gwin III, MD performed more inpatient hospital care (for patient admitted to hospital) procedures for Medicare patients than 75% of providers in related specialties within Washington.

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. William Rayford Gwin III, MD treated as a medical oncologist in Seattle, WA during 2017 were hospital care and inpatient care.

Volume of procedures performed by Dr. William Rayford Gwin III, MD for Medicare patients.

doctor visit	62
hospital care	106
inpatient care	106

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. William Rayford Gwin III, MD.

**Gender**
Male	14
Female	45

**Age**
From 65 to 74	30
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Rayford Gwin III, MD in 2017

The most common conditions of Medicare patients that Dr. William Rayford Gwin III, MD treated during 2017 were cancer, hypertension, chronic kidney disease and depression.

Hypertension	68
High Cholesterol	37
Stroke	0
Ischemic Heart Disease	20
Depression	39
Chronic Kidney Disease	53
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	19
Dementia	0
Cancer	73

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. William Rayford Gwin III, MD treated as a medical oncologist in Seattle, WA during 2018 were hospital care and inpatient care.

Volume of procedures performed by Dr. William Rayford Gwin III, MD for Medicare patients.

doctor visit	98
hospital care	126
inpatient care	126

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. William Rayford Gwin III, MD.

**Gender**
Male	21
Female	67

**Ethnicity**
Non-Hispanic White	63
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	44
From 75 to 84	22
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Rayford Gwin III, MD in 2018

The most common conditions of Medicare patients that Dr. William Rayford Gwin III, MD treated during 2018 were cancer, hypertension, chronic kidney disease and high cholesterol.

Hypertension	56
High Cholesterol	44
Stroke	0
Ischemic Heart Disease	20
Depression	31
Chronic Kidney Disease	44
Asthma	0
Osteoperosis	14
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	26
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. William Rayford Gwin III, MD treated as a medical oncologist in Seattle, WA during 2019 were hospital care and inpatient care.

Volume of procedures performed by Dr. William Rayford Gwin III, MD for Medicare patients.

doctor visit	103
hospital care	91
inpatient care	91

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. William Rayford Gwin III, MD.

**Gender**
Male	28
Female	58

**Ethnicity**
Non-Hispanic White	71
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	44
From 75 to 84	27
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Rayford Gwin III, MD in 2019

The most common conditions of Medicare patients that Dr. William Rayford Gwin III, MD treated during 2019 were cancer, hypertension, high cholesterol and depression.

Hypertension	62
High Cholesterol	43
Stroke	0
Ischemic Heart Disease	21
Depression	36
Chronic Kidney Disease	35
Asthma	0
Osteoperosis	17
Atrial Fibrilation	13
Heart Failure	17
Chronic Obstructive Pulmonary Disease	0
Diabetes	20
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

Volume of procedures performed by Dr. William Rayford Gwin III, MD for Medicare patients.

doctor visit	158

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. William Rayford Gwin III, MD.

**Ethnicity**
Non-Hispanic White	88
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	48
From 75 to 84	35
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Rayford Gwin III, MD in 2020

The most common conditions of Medicare patients that Dr. William Rayford Gwin III, MD treated during 2020 were cancer, hypertension, depression and high cholesterol.

Hypertension	45
High Cholesterol	28
Stroke	0
Ischemic Heart Disease	13
Depression	31
Chronic Kidney Disease	23
Asthma	0
Osteoperosis	15
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	20
Dementia	10
Cancer	75

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. William Rayford Gwin III, MD treated as a medical oncologist in Seattle, WA during 2021 were hospital care and inpatient care.

Volume of procedures performed by Dr. William Rayford Gwin III, MD for Medicare patients.

doctor visit	214
hospital care	59
inpatient care	59

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. William Rayford Gwin III, MD.

**Gender**
Male	20
Female	108

**Ethnicity**
Non-Hispanic White	107
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	69
From 75 to 84	36
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Rayford Gwin III, MD in 2021

The most common conditions of Medicare patients that Dr. William Rayford Gwin III, MD treated during 2021 were cancer, hypertension, high cholesterol and chronic kidney disease.

Hypertension	52
High Cholesterol	43
Stroke	0
Ischemic Heart Disease	18
Depression	28
Chronic Kidney Disease	31
Asthma	0
Osteoperosis	14
Atrial Fibrilation	0
Heart Failure	9
Chronic Obstructive Pulmonary Disease	0
Diabetes	23
Dementia	9
Cancer	75

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

Volume of procedures performed by Dr. William Rayford Gwin III, MD for Medicare patients.

doctor visit	222

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. William Rayford Gwin III, MD.

**Ethnicity**
Non-Hispanic White	75
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	50
From 75 to 84	30
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Rayford Gwin III, MD in 2022

The most common conditions of Medicare patients that Dr. William Rayford Gwin III, MD treated during 2022 were cancer, hypertension, high cholesterol and osteoperosis.

Hypertension	57
High Cholesterol	52
Stroke	0
Ischemic Heart Disease	0
Depression	21
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	23
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	18
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. William Rayford Gwin III, MD treated as a medical oncologist in Seattle, WA during 2023 were hospital care and inpatient care.

Volume of procedures performed by Dr. William Rayford Gwin III, MD for Medicare patients.

doctor visit	216
hospital care	127
inpatient care	127

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. William Rayford Gwin III, MD.

**Gender**
Male	19
Female	103

**Ethnicity**
Non-Hispanic White	106
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	60
From 75 to 84	45
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. William Rayford Gwin III, MD in 2023

The most common conditions of Medicare patients that Dr. William Rayford Gwin III, MD treated during 2023 were cancer, hypertension, high cholesterol and osteoperosis.

Hypertension	62
High Cholesterol	54
Stroke	9
Ischemic Heart Disease	18
Depression	23
Chronic Kidney Disease	19
Asthma	13
Osteoperosis	25
Atrial Fibrilation	14
Heart Failure	14
Chronic Obstructive Pulmonary Disease	0
Diabetes	20
Dementia	0
Cancer	75

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2017 - 2023

Volume of procedures performed by Dr. William Rayford Gwin III, MD for Medicare patients.

The highest averages for the top procedures that Dr. William Rayford Gwin III, MD treated as a medical oncologist in Seattle, WA were hospital care and inpatient care.

doctor visit	153
hospital care	101
inpatient care	101

Average Medicare Patient Data From 2017 - 2023

Information about Medicare patients treated by Dr. William Rayford Gwin III, MD.

**Gender**
Male	14
Female	54

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	72
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
75 to 84	27
85 and over	0
Less than 65	0
65 to 74	49

Average of Total of Conditions of Medicare patients treated by Dr. William Rayford Gwin III, MD From 2017 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. William Rayford Gwin III, MD treated were cancer, hypertension, high cholesterol and depression.

Hypertension	57
High Cholesterol	43
Stroke	1
Ischemic Heart Disease	15
Depression	29
Chronic Kidney Disease	29
Asthma	1
Osteoporosis	15
Heart Failure	5
Chronic Obstructive Pulmonary Disease	0
Diabetes	20
Atrial Fibrillation	3
Cancer	74
Dementia	2

Education & Training

Dr. William Rayford Gwin III, MD graduated from University of Alabama at Birmingham School of Medicine. He completed residency at University of Washington Affiliated Hospitals. He is certified by the Internal Medicine, American Board of Internal Medicine and has a state license in Washington.

Medical School: University of Alabama at Birmingham School of Medicine

Residency: University of Washington Affiliated Hospitals

Board Certification: Internal Medicine, American Board of Internal Medicine (2009)

Licensed In: Washington

Affiliations & Hospitals

Dr. William Rayford Gwin III, MD is associated with these hospitals and organizations:

Fred Hutchinson Cancer Center

THE ASSOCIATION OF UNIVERSITY PHYSICIANS

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General Payments

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

**Payments by Company**
AstraZeneca Pharmaceuticals LP	$6,016 Enhertu $4,788	$1,228
Novartis Pharmaceuticals Corporation	$2,000 Exjade $2,000
Puma Biotechnology, Inc.	$1,117 Nerlynx $1,117
E.R. Squibb & Sons, L.L.C.	$990 $990
GlaxoSmithKline, LLC.	$598 $598
Other	$895 Trodelvy $436	ZIIHERA $192	Orserdu $107	Avastin $12	$149

**Types of Payments**
Consulting Fee	$8,138
Food and Beverage	$1,888
Travel and Lodging	$1,578
Education	$12

Research Payments

Dr. William Rayford Gwin III, MD has received 21 research payments totaling $560,309.

Biography

Dr. William Gwin, who practices in Seattle, WA, is a medical specialist in adult oncology and medical oncology. In Dr. Gwin's practice, he is particularly interested in breast cancer. He is affiliated with Fred Hutchinson Cancer Center. He studied medicine at the University of Alabama at Birmingham School of Medicine. Dr. Gwin's training includes a residency program at a hospital affiliated with the University of Washington.