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Dr. Grant Masashi Hayashi, MD

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Specializes in: Pathology

University of Hawaii at Manoa, John A. Burns School of Medicine (1994)

1350 Stardust Street Suite D
Reno, NV 89503

(775) 746-3400

Dr. Grant Masashi Hayashi, MD is a pathologist in Reno, NV specializing in pathology. He graduated from University of Hawaii at Manoa, John A. Burns School of Medicine in 1994 and has 32 years of experience. Dr. Grant Masashi Hayashi, MD is affiliated with DIAGNOSTIC PATHOLOGY MEDICAL GROUP INC.

Office Locations

1350 Stardust Street Suite D
Reno, NV 89503

(775) 746-3400

(775) 746-3411

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Noteworthy Medicare Patient Procedures Performed by Dr. Grant Masashi Hayashi, MD in 2023

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

Top 5%

By Affordability:

lab tests

special stains

In 2023, Dr. Grant Masashi Hayashi, MD had a list price for lab tests, and special stains that was lower than the list prices billed to Medicare by 95% of providers in related specialties within Nevada. 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 10%

By Affordability:

concentrated smear of non-gynecologic specimen

immunohistochemistry test

In 2023, Dr. Grant Masashi Hayashi, MD had a list price for concentrated smear (cytospin) of non-gynecologic specimen, and immunohistochemistry (IHC) test that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Nevada. 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

2014 Medicare Procedure Volume

The top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV during 2014 were lab tests.

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

lab tests	582

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Gender**
Male	625
Female	703

**Ethnicity**
Non-Hispanic White	1177
Black	14
Hispanic	69
Asian	21
Other	30
Native American	17

**Age**
From 65 to 74	821
From 75 to 84	319
85 and over	32
Less than 65	156

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2014

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2014 were hypertension, high cholesterol, diabetes and ischemic heart disease.

Hypertension	58
High Cholesterol	54
Stroke	3
Ischemic Heart Disease	21
Depression	16
Chronic Kidney Disease	15
Asthma	7
Osteoperosis	5
Atrial Fibrilation	7
Heart Failure	6
Chronic Obstructive Pulmonary Disease	12
Diabetes	21
Dementia	14
Cancer	14

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV during 2015 were lab tests.

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

lab tests	961

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Gender**
Male	2574
Female	2660

**Ethnicity**
Non-Hispanic White	4646
Black	54
Hispanic	258
Asian	88
Other	118
Native American	70

**Age**
From 65 to 74	3178
From 75 to 84	1278
85 and over	150
Less than 65	628

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2015

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2015 were hypertension, high cholesterol, diabetes and ischemic heart disease.

Hypertension	58
High Cholesterol	57
Stroke	3
Ischemic Heart Disease	22
Depression	18
Chronic Kidney Disease	16
Asthma	11
Osteoperosis	6
Atrial Fibrilation	6
Heart Failure	6
Chronic Obstructive Pulmonary Disease	13
Diabetes	24
Dementia	12
Cancer	13

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV during 2016 were lab tests, consultation and cytology.

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

consultation	66
cytology	66
lab tests	311

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Gender**
Male	691
Female	836

**Ethnicity**
Non-Hispanic White	935
Black	145
Hispanic	174
Asian	231
Other	0
Native American	0

**Age**
From 65 to 74	732
From 75 to 84	414
85 and over	112
Less than 65	269

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2016

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2016 were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	73
High Cholesterol	57
Stroke	4
Ischemic Heart Disease	28
Depression	24
Chronic Kidney Disease	36
Asthma	21
Osteoperosis	8
Atrial Fibrilation	9
Heart Failure	19
Chronic Obstructive Pulmonary Disease	16
Diabetes	37
Dementia	7
Cancer	18

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV during 2017 were lab tests, cytology and consultation.

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

consultation	26
cytology	81
lab tests	371

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Gender**
Male	682
Female	842

**Ethnicity**
Non-Hispanic White	913
Black	118
Hispanic	167
Asian	271
Other	0
Native American	0

**Age**
From 65 to 74	748
From 75 to 84	426
85 and over	111
Less than 65	239

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2017

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2017 were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	72
High Cholesterol	56
Stroke	4
Ischemic Heart Disease	28
Depression	24
Chronic Kidney Disease	36
Asthma	13
Osteoperosis	11
Atrial Fibrilation	8
Heart Failure	16
Chronic Obstructive Pulmonary Disease	16
Diabetes	37
Dementia	8
Cancer	16

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV during 2018 were lab tests and cytology.

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

cytology	29
lab tests	167

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Gender**
Male	344
Female	385

**Ethnicity**
Non-Hispanic White	452
Black	86
Hispanic	71
Asian	98
Other	0
Native American	0

**Age**
From 65 to 74	372
From 75 to 84	189
85 and over	49
Less than 65	119

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2018

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2018 were hypertension, high cholesterol, chronic kidney disease and diabetes.

Hypertension	72
High Cholesterol	58
Stroke	4
Ischemic Heart Disease	29
Depression	24
Chronic Kidney Disease	37
Asthma	10
Osteoperosis	11
Atrial Fibrilation	9
Heart Failure	16
Chronic Obstructive Pulmonary Disease	17
Diabetes	37
Dementia	8
Cancer	18

Medicare Procedure and Patient Information

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2020

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2020 were hypertension, high cholesterol and chronic kidney disease.

Hypertension	68
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	50
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV during 2021 were cytology.

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

cytology	16

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Gender**
Male	12
Female	19

**Ethnicity**
Non-Hispanic White	20
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	0
85 and over	0
Less than 65	13

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2021

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2021 were hypertension, high cholesterol and chronic kidney disease.

Hypertension	68
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	45
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV during 2022 were cytology and gynecologic pathology.

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

cytology	11
gynecologic pathology	11

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Age**
From 65 to 74	0
From 75 to 84	0
85 and over	0
Less than 65	14

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2022

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2022 were hypertension and high cholesterol.

Hypertension	75
High Cholesterol	68
Stroke	0
Ischemic Heart Disease	0
Depression	0
Chronic Kidney Disease	0
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	0
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV during 2023 were lab tests and cytology.

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

cytology	51
lab tests	119

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Gender**
Male	163
Female	225

**Ethnicity**
Non-Hispanic White	346
Black	0
Hispanic	22
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	201
From 75 to 84	126
85 and over	43
Less than 65	18

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2023

The most common conditions of Medicare patients that Dr. Grant Masashi Hayashi, MD treated during 2023 were high cholesterol, hypertension, ischemic heart disease and diabetes.

Hypertension	69
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	27
Depression	22
Chronic Kidney Disease	25
Asthma	11
Osteoperosis	14
Atrial Fibrilation	22
Heart Failure	21
Chronic Obstructive Pulmonary Disease	22
Diabetes	26
Dementia	7
Cancer	24

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2014 - 2023

Volume of procedures performed by Dr. Grant Masashi Hayashi, MD for Medicare patients.

The highest averages for the top procedures that Dr. Grant Masashi Hayashi, MD treated as a pathologist in Reno, NV were lab tests, consultation, cytology and gynecologic pathology.

consultation	46
cytology	42
gynecologic pathology	11
lab tests	418

Average Medicare Patient Data From 2014 - 2023

Information about Medicare patients treated by Dr. Grant Masashi Hayashi, MD.

**Gender**
Male	565
Female	630

**Ethnicity**
Black / African American	46
Asian / Pacific Islander	78
Non-Hispanic White	943
Native American / Alaskan Native	9
Hispanic	84
Other	16

**Age**
75 to 84	305
85 and over	55
Less than 65	161
65 to 74	672

Average of Total of Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD From 2014 - 2023

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

Hypertension	68
High Cholesterol	61
Stroke	3
Ischemic Heart Disease	17
Depression	14
Chronic Kidney Disease	28
Asthma	8
Osteoporosis	6
Heart Failure	9
Chronic Obstructive Pulmonary Disease	10
Diabetes	20
Atrial Fibrillation	6
Cancer	11
Dementia	6

Education & Training

Dr. Grant Masashi Hayashi, MD graduated from University of Hawaii at Manoa, John A. Burns School of Medicine in 1994. He has a state license in Nevada.

Medical School: University of Hawaii at Manoa, John A. Burns School of Medicine (1994)

Licensed In: Nevada

Affiliations & Hospitals

Dr. Grant Masashi Hayashi, MD is associated with these hospitals and organizations:

DIAGNOSTIC PATHOLOGY MEDICAL GROUP INC

Ratings & Reviews

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General Payments

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

**Payments by Company**
Gilead Sciences Inc	$103 Harvoni $103
Genentech USA, Inc.	$100 $100
Relypsa, Inc.	$60 VELTASSA $60

**Types of Payments**
Food and Beverage	$262

Biography

Dr. Grant Hayashi practices pathology in Reno, NV. Dr. Hayashi attended medical school at the University of Hawaii at Manoa, John A. Burns School of Medicine.

Select Year:

Dr. Grant Masashi Hayashi, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Grant Masashi Hayashi, MD in 2023

By Affordability:

By Affordability:

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2018

Medicare Procedure and Patient Information

Medicare Procedure and Patient Information

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD in 2023

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2014 - 2023

Average Medicare Patient Data From 2014 - 2023

Average of Total of Conditions of Medicare patients treated by Dr. Grant Masashi Hayashi, MD From 2014 - 2023

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

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