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Dr. Thomas A. Gionis, MD

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Specializes in: Family Medicine and Emergency Medicine

Medical University of South Carolina College of Medicine (1975)

13100 Studebaker Road
Norwalk, CA 90650

(562) 864-6377

Dr. Thomas A. Gionis, MD is a family medicine practitioner in Norwalk, CA specializing in family medicine and emergency medicine. He graduated from Medical University of South Carolina College of Medicine in 1975 and has 51 years of experience. Dr. Thomas A. Gionis, MD is affiliated with AMERICAN SPECIALTY PHYSICIANS GROUP INC.

Office Locations

13100 Studebaker Road
Norwalk, CA 90650

(562) 864-6377

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In The News (see more mentions in the news)

“A Superior Court judge today refused to overturn a lower court decision denying bail to Dr. Thomas A. Gionis, who is accused of masterminding an attack on his ex-wife, Aissa Wayne, and her...”—"Judge Upholds Denial of Bail for Wayne's Accused Attacker", Los Angeles Times, June 2025

“A judge today ordered Dr. Thomas A. Gionis held without bail in the Orange County Jail pending his criminal trial for his alleged involvement in an attack on his ex-wife, Aissa Wayne, and her...”—"SOUTHLAND : Gionis Ordered Held Without Bail", Los Angeles Times, June 2025

“A judge today ordered Dr. Thomas A. Gionis held without bail in Orange County Jail pending his criminal trial for his alleged involvement in an attack on his ex-wife, Aissa Wayne, and her...”—"Wayne's Ex-Husband Denied Bail : Gionis to Be Held in Orange County Jail Pending His Trial", Los Angeles Times, June 2025

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA during 2012 were emergency care.

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

emergency care	75

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA during 2013 were emergency care.

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

emergency care	134

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas A. Gionis, MD.

**Gender**
Male	56
Female	68

**Ethnicity**
Non-Hispanic White	38
Black	17
Hispanic	56
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	30
From 75 to 84	30
85 and over	20
Less than 65	44

Conditions of Medicare patients treated by Dr. Thomas A. Gionis, MD in 2013

Hypertension	75
High Cholesterol	54
Stroke	12
Ischemic Heart Disease	60
Depression	36
Chronic Kidney Disease	43
Asthma	22
Osteoperosis	0
Atrial Fibrilation	16
Heart Failure	49
Chronic Obstructive Pulmonary Disease	44
Diabetes	56
Dementia	32
Cancer	0

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA during 2014 were emergency care.

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

emergency care	22

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas A. Gionis, MD.

**Gender**
Male	23
Female	19

**Ethnicity**
Non-Hispanic White	0
Black	0
Hispanic	17
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	13
85 and over	0
Less than 65	15

Conditions of Medicare patients treated by Dr. Thomas A. Gionis, MD in 2014

Hypertension	74
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	48
Depression	38
Chronic Kidney Disease	36
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	36
Chronic Obstructive Pulmonary Disease	26
Diabetes	55
Dementia	31
Cancer	0

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA during 2016 were emergency care and catheterization.

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

catheterization	13
emergency care	379

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas A. Gionis, MD.

**Gender**
Male	151
Female	197

**Ethnicity**
Non-Hispanic White	296
Black	0
Hispanic	27
Asian	0
Other	0
Native American	11

**Age**
From 65 to 74	110
From 75 to 84	89
85 and over	55
Less than 65	94

Conditions of Medicare patients treated by Dr. Thomas A. Gionis, MD in 2016

Hypertension	66
High Cholesterol	45
Stroke	9
Ischemic Heart Disease	40
Depression	31
Chronic Kidney Disease	34
Asthma	36
Osteoperosis	5
Atrial Fibrilation	15
Heart Failure	29
Chronic Obstructive Pulmonary Disease	32
Diabetes	37
Dementia	20
Cancer	8

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA during 2017 were emergency care, X-rays and thoracic (chest) imaging.

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

emergency care	652
thoracic (chest) imaging	28
X-rays	28

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas A. Gionis, MD.

**Gender**
Male	225
Female	312

**Ethnicity**
Non-Hispanic White	479
Black	0
Hispanic	29
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	186
From 75 to 84	166
85 and over	82
Less than 65	103

Conditions of Medicare patients treated by Dr. Thomas A. Gionis, MD in 2017

Hypertension	64
High Cholesterol	37
Stroke	8
Ischemic Heart Disease	42
Depression	23
Chronic Kidney Disease	32
Asthma	11
Osteoperosis	10
Atrial Fibrilation	14
Heart Failure	31
Chronic Obstructive Pulmonary Disease	28
Diabetes	33
Dementia	14
Cancer	8

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA during 2018 were emergency care.

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

emergency care	520

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas A. Gionis, MD.

**Gender**
Male	0
Female	257

**Ethnicity**
Non-Hispanic White	424
Black	0
Hispanic	15
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	173
From 75 to 84	143
85 and over	69
Less than 65	78

Conditions of Medicare patients treated by Dr. Thomas A. Gionis, MD in 2018

Hypertension	64
High Cholesterol	43
Stroke	5
Ischemic Heart Disease	41
Depression	24
Chronic Kidney Disease	31
Asthma	8
Osteoperosis	11
Atrial Fibrilation	12
Heart Failure	30
Chronic Obstructive Pulmonary Disease	27
Diabetes	28
Dementia	17
Cancer	8

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA during 2019 were emergency care.

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

emergency care	581

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas A. Gionis, MD.

**Gender**
Male	211
Female	269

**Ethnicity**
Non-Hispanic White	440
Black	0
Hispanic	15
Asian	0
Other	0
Native American	13

**Age**
From 65 to 74	167
From 75 to 84	157
85 and over	69
Less than 65	87

Conditions of Medicare patients treated by Dr. Thomas A. Gionis, MD in 2019

Hypertension	62
High Cholesterol	49
Stroke	7
Ischemic Heart Disease	45
Depression	24
Chronic Kidney Disease	32
Asthma	10
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	32
Chronic Obstructive Pulmonary Disease	27
Diabetes	30
Dementia	15
Cancer	10

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA during 2020 were emergency care.

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

emergency care	196

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Thomas A. Gionis, MD.

**Gender**
Male	79
Female	101

**Ethnicity**
Non-Hispanic White	161
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	63
From 75 to 84	60
85 and over	33
Less than 65	24

Conditions of Medicare patients treated by Dr. Thomas A. Gionis, MD in 2020

Hypertension	65
High Cholesterol	46
Stroke	7
Ischemic Heart Disease	45
Depression	26
Chronic Kidney Disease	38
Asthma	7
Osteoperosis	12
Atrial Fibrilation	16
Heart Failure	36
Chronic Obstructive Pulmonary Disease	22
Diabetes	27
Dementia	16
Cancer	7

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2020

Volume of procedures performed by Dr. Thomas A. Gionis, MD for Medicare patients.

The highest averages for the top procedures that Dr. Thomas A. Gionis, MD treated as a family medicine practitioner in Norwalk, CA were emergency care, X-rays, thoracic (chest) imaging and catheterization.

catheterization	13
emergency care	319
thoracic (chest) imaging	28
X-rays	28

Average Medicare Patient Data From 2012 - 2020

Information about Medicare patients treated by Dr. Thomas A. Gionis, MD.

**Gender**
Male	93
Female	152

**Ethnicity**
Black / African American	2
Asian / Pacific Islander	0
Non-Hispanic White	229
Native American / Alaskan Native	3
Hispanic	19
Other	0

**Age**
75 to 84	82
85 and over	41
Less than 65	55
65 to 74	91

Average of Total of Conditions of Medicare patients treated by Dr. Thomas A. Gionis, MD From 2012 - 2020

The highest averages of the most common conditions of Medicare patients that Dr. Thomas A. Gionis, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	58
High Cholesterol	41
Stroke	6
Ischemic Heart Disease	40
Depression	25
Chronic Kidney Disease	30
Asthma	11
Osteoporosis	6
Heart Failure	30
Chronic Obstructive Pulmonary Disease	25
Diabetes	33
Atrial Fibrillation	10
Dementia	18
Cancer	5

Education & Training

Dr. Thomas A. Gionis, MD graduated from Medical University of South Carolina College of Medicine in 1975. He has a state license in California.

Medical School: Medical University of South Carolina College of Medicine (1975)

Licensed In: California

Affiliations & Hospitals

Dr. Thomas A. Gionis, MD is associated with these hospitals and organizations:

AMERICAN SPECIALTY PHYSICIANS GROUP INC

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Biography

Dr. Thomas Gionis' medical specialty is family medicine and emergency medicine. He graduated from Medical University of South Carolina College of Medicine.