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Dr. Gregory S. Retzinger, PhD, MD

(Gregory S. Retzinger, MD, PhD)

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Specializes in: General Practice and Pathology

University of Chicago Pritzker School of Medicine (1983)

Professional interests include: poisoning, microbiology

251 E Huron Street Feinberg Pavilion, Ste 7-510C
Chicago, IL 60611

(312) 926-2258

Dr. Gregory S. Retzinger, PhD, MD is a general practitioner in Chicago, IL specializing in general practice and pathology. He graduated from University of Chicago Pritzker School of Medicine in 1983 and has 43 years of experience. Dr. Gregory S. Retzinger, PhD, MD is affiliated with Northwestern Medicine, Northwestern University Feinberg School of Medicine and Northwestern Medical Group.

Office Locations

251 E Huron Street Feinberg Pavilion, Ste 7-510C
Chicago, IL 60611

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303 E Chicago Avenue Ward Building Room 3-140
Chicago, IL 60611

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Noteworthy Medicare Patient Procedures Performed by Dr. Gregory S. Retzinger, PhD, MD in 2023

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

Top 5%

By Volume:

lab tests

lactate dehydrogenase test

uric acid blood test

By Affordability:

In 2023, among providers in related specialties within Illinois, Dr. Gregory S. Retzinger, PhD, MD performed more lab tests, lactate dehydrogenase (LDH) test, and uric acid blood test procedures for Medicare patients than 95% of them and he also had a list price for magnesium test, reticulocyte count (immature red blood cell count), uric acid blood test, and uric acid test that was lower than the list prices billed to Medicare by 95% 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.

Top 25%

By Volume:

blood draw

phlebotomy for lab tests

phosphorus blood test

urinalysis

By Affordability:

blood draw

blood draw for lab tests

lactate dehydrogenase test

phlebotomy for lab tests

venipuncture

In 2012, among providers in related specialties within Illinois, Dr. Gregory S. Retzinger, PhD, MD performed more blood draw, phlebotomy for lab tests, phosphorus blood test, and urinalysis procedures for Medicare patients than 75% of them and he also had a list price for blood draw, blood draw for lab tests, lactate dehydrogenase (LDH) test, phlebotomy for lab tests, and venipuncture (phlebotomy) 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

The top procedures that Dr. Gregory S. Retzinger, PhD, MD treated as a general practitioner in Chicago, IL during 2012 were lab tests.

Volume of procedures performed by Dr. Gregory S. Retzinger, PhD, MD for Medicare patients.

lab tests	19

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Retzinger, PhD, MD treated as a general practitioner in Chicago, IL during 2018 were lab tests.

Volume of procedures performed by Dr. Gregory S. Retzinger, PhD, MD for Medicare patients.

lab tests	826

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD.

**Gender**
Male	184
Female	175

**Ethnicity**
Non-Hispanic White	250
Black	59
Hispanic	23
Asian	13
Other	14
Native American	0

**Age**
From 65 to 74	192
From 75 to 84	98
85 and over	31
Less than 65	38

Conditions of Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD in 2018

Hypertension	65
High Cholesterol	49
Stroke	6
Ischemic Heart Disease	36
Depression	20
Chronic Kidney Disease	43
Asthma	7
Osteoperosis	16
Atrial Fibrilation	12
Heart Failure	24
Chronic Obstructive Pulmonary Disease	11
Diabetes	26
Dementia	8
Cancer	12

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Retzinger, PhD, MD treated as a general practitioner in Chicago, IL during 2019 were lab tests.

Volume of procedures performed by Dr. Gregory S. Retzinger, PhD, MD for Medicare patients.

lab tests	466

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD.

**Gender**
Male	92
Female	131

**Ethnicity**
Non-Hispanic White	150
Black	42
Hispanic	15
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	116
From 75 to 84	59
85 and over	17
Less than 65	31

Conditions of Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD in 2019

Hypertension	67
High Cholesterol	53
Stroke	9
Ischemic Heart Disease	31
Depression	21
Chronic Kidney Disease	49
Asthma	7
Osteoperosis	16
Atrial Fibrilation	11
Heart Failure	26
Chronic Obstructive Pulmonary Disease	9
Diabetes	26
Dementia	7
Cancer	15

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Retzinger, PhD, MD treated as a general practitioner in Chicago, IL during 2020 were lab tests.

Volume of procedures performed by Dr. Gregory S. Retzinger, PhD, MD for Medicare patients.

lab tests	415

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD.

**Gender**
Male	90
Female	113

**Ethnicity**
Non-Hispanic White	134
Black	39
Hispanic	16
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	110
From 75 to 84	60
85 and over	12
Less than 65	21

Conditions of Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD in 2020

Hypertension	60
High Cholesterol	40
Stroke	6
Ischemic Heart Disease	26
Depression	27
Chronic Kidney Disease	44
Asthma	6
Osteoperosis	25
Atrial Fibrilation	10
Heart Failure	22
Chronic Obstructive Pulmonary Disease	6
Diabetes	21
Dementia	8
Cancer	14

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Retzinger, PhD, MD treated as a general practitioner in Chicago, IL during 2022 were lab tests and blood draw.

Volume of procedures performed by Dr. Gregory S. Retzinger, PhD, MD for Medicare patients.

blood draw	311
lab tests	1804

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD.

**Gender**
Male	292
Female	336

**Ethnicity**
Non-Hispanic White	439
Black	104
Hispanic	41
Asian	20
Other	24
Native American	0

**Age**
From 65 to 74	282
From 75 to 84	213
85 and over	64
Less than 65	69

Conditions of Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD in 2022

Hypertension	74
High Cholesterol	71
Stroke	9
Ischemic Heart Disease	31
Depression	21
Chronic Kidney Disease	36
Asthma	8
Osteoperosis	32
Atrial Fibrilation	20
Heart Failure	25
Chronic Obstructive Pulmonary Disease	15
Diabetes	28
Dementia	5
Cancer	24

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Gregory S. Retzinger, PhD, MD treated as a general practitioner in Chicago, IL during 2023 were lab tests and blood draw.

Volume of procedures performed by Dr. Gregory S. Retzinger, PhD, MD for Medicare patients.

blood draw	299
lab tests	4872

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD.

**Gender**
Male	194
Female	266

**Ethnicity**
Non-Hispanic White	365
Black	60
Hispanic	16
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	216
From 75 to 84	165
85 and over	37
Less than 65	42

Conditions of Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	13
Ischemic Heart Disease	32
Depression	22
Chronic Kidney Disease	29
Asthma	10
Osteoperosis	13
Atrial Fibrilation	24
Heart Failure	23
Chronic Obstructive Pulmonary Disease	25
Diabetes	32
Dementia	7
Cancer	46

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. Gregory S. Retzinger, PhD, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregory S. Retzinger, PhD, MD treated as a general practitioner in Chicago, IL were lab tests and blood draw.

blood draw	305
lab tests	1400

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD.

**Gender**
Female	170
Male	142

**Ethnicity**
Black / African American	50
Asian / Pacific Islander	5
Non-Hispanic White	223
Native American / Alaskan Native	0
Hispanic	18
Other	6

**Age**
85 and over	26
75 to 84	99
Less than 65	33
65 to 74	152

Average of Total of Conditions of Medicare patients treated by Dr. Gregory S. Retzinger, PhD, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Gregory S. Retzinger, PhD, MD treated were hypertension, high cholesterol, chronic kidney disease and ischemic heart disease.

Hypertension	56
High Cholesterol	48
Stroke	7
Ischemic Heart Disease	26
Depression	18
Chronic Kidney Disease	33
Asthma	6
Osteoporosis	17
Heart Failure	20
Chronic Obstructive Pulmonary Disease	11
Diabetes	22
Atrial Fibrillation	12
Dementia	5
Cancer	18

Education & Training

Dr. Gregory S. Retzinger, PhD, MD graduated from University of Chicago Pritzker School of Medicine in 1983. He completed residency at University of North Carolina Hospitals. He is certified by the American Board of Pathology - Pathology - Clinical (Certified) and has a state license in Ohio.

Medical School: University of Chicago Pritzker School of Medicine (1983)

Residency: University of North Carolina Hospitals (1986)

Board Certification: American Board of Pathology - Pathology - Clinical (Certified)

Licensed In: Ohio

Affiliations & Hospitals

Dr. Gregory S. Retzinger, PhD, MD is associated with these hospitals and organizations:

Northwestern Medicine

Northwestern University Feinberg School of Medicine

Northwestern Medical Group

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. Gregory S. Retzinger, PhD, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
GE Healthcare	$57 $57
BioFire Diagnostics, LLC	$40 $40
Abbott Laboratories	$18 Architect system $18
GlaxoSmithKline, LLC.	$15 BENLYSTA $15

**Types of Payments**
Travel and Lodging	$57
Honoraria	$40
Food and Beverage	$18
Consulting Fee	$15

Biography

Dr. Gregory Retzinger works as a general practice and pathology. His areas of expertise consist of poisoning and microbiology. Dr. Retzinger graduated from the University of Chicago, Pritzker School of Medicine. He trained at UNC Hospitals for residency. He has received professional recognition including the following: Lucille P. Markey Biomedical Scholar, Lucille P. Markey Charitable Trust. His hospital/clinic affiliations include Northwestern Medical Group (NMG), Northwestern University Feinberg School of Medicine, and Northwestern Memorial Hospital. Yext reports that Dr. Retzinger is not accepting new patients.