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Dr. Leonard M. Klein, MD

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Specializes in: Adult Oncology and Adult Hematology

SUNY, University at Buffalo School of Medicine & Biomedical Sciences (1978)

8915 W Golf Road
Niles, IL 60714

(847) 827-9060

Dr. Leonard M. Klein, MD is an oncologist in Niles, IL specializing in adult oncology and adult hematology. He graduated from SUNY, University at Buffalo School of Medicine & Biomedical Sciences in 1978 and has 48 years of experience. Dr. Leonard M. Klein, MD is affiliated with ILLINOIS CANCER SPECIALISTS.

Office Locations

8915 W Golf Road
Niles, IL 60714

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Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2012 were minimally invasive procedures, inpatient care, chemotherapy and biological response modifier (BRM) therapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	37
aspiration	18
biological response modifier (BRM) therapy	420
blood draw	27
bone marrow tests	36
chemotherapy	420
CT scan	114
diagnostic procedures	36
doctor visit	1994
hospital care	420
inpatient care	420
minimally invasive procedures	511
pelvic imaging	37
port flush	26
preventive care	42
radiation therapy	15
thoracic (chest) imaging	108
vaccines	42
X-rays	31

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2013 were inpatient care, hospital care, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	57
biological response modifier (BRM) therapy	392
blood draw	17
bone marrow tests	15
chemotherapy	392
CT scan	116
diagnostic procedures	15
doctor visit	1842
hospital care	533
inpatient care	533
minimally invasive procedures	453
pelvic imaging	57
port flush	21
preventive care	25
radiation therapy	102
thoracic (chest) imaging	73
vaccines	25
X-rays	14

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	207
Female	271

**Ethnicity**
Non-Hispanic White	441
Black	0
Hispanic	0
Asian	16
Other	0
Native American	0

**Age**
From 65 to 74	186
From 75 to 84	192
85 and over	74
Less than 65	26

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2013

Hypertension	66
High Cholesterol	56
Stroke	5
Ischemic Heart Disease	29
Depression	15
Chronic Kidney Disease	33
Asthma	5
Osteoperosis	12
Atrial Fibrilation	14
Heart Failure	19
Chronic Obstructive Pulmonary Disease	14
Diabetes	27
Dementia	8
Cancer	53

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2014 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and inpatient care.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	52
biological response modifier (BRM) therapy	476
bone marrow tests	20
chemotherapy	476
CT scan	105
diagnostic procedures	20
doctor visit	1786
hospital care	411
inpatient care	411
minimally invasive procedures	608
pelvic imaging	52
preventive care	41
radiation therapy	44
thoracic (chest) imaging	71
vaccines	41
X-rays	18

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	205
Female	238

**Ethnicity**
Non-Hispanic White	402
Black	0
Hispanic	0
Asian	19
Other	0
Native American	0

**Age**
From 65 to 74	183
From 75 to 84	172
85 and over	70
Less than 65	18

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2014

Hypertension	67
High Cholesterol	56
Stroke	6
Ischemic Heart Disease	31
Depression	17
Chronic Kidney Disease	36
Asthma	5
Osteoperosis	11
Atrial Fibrilation	16
Heart Failure	20
Chronic Obstructive Pulmonary Disease	12
Diabetes	29
Dementia	7
Cancer	51

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2015 were minimally invasive procedures, inpatient care, hospital care and chemotherapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	45
biological response modifier (BRM) therapy	321
blood draw	18
bone marrow tests	22
chemotherapy	321
CT scan	85
diagnostic procedures	22
doctor visit	1577
hospital care	339
inpatient care	339
minimally invasive procedures	533
pelvic imaging	45
port flush	20
preventive care	37
thoracic (chest) imaging	53
vaccines	37
X-rays	13

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	320
Female	418

**Ethnicity**
Non-Hispanic White	680
Black	0
Hispanic	0
Asian	32
Other	0
Native American	0

**Age**
From 65 to 74	298
From 75 to 84	294
85 and over	108
Less than 65	38

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2015

Hypertension	67
High Cholesterol	54
Stroke	5
Ischemic Heart Disease	28
Depression	15
Chronic Kidney Disease	35
Asthma	9
Osteoperosis	15
Atrial Fibrilation	15
Heart Failure	20
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	7
Cancer	52

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2016 were minimally invasive procedures, inpatient care, hospital care and chemotherapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	26
aspiration	16
biological response modifier (BRM) therapy	214
bone marrow tests	33
chemotherapy	214
CT scan	49
diagnostic procedures	33
doctor visit	1427
hospital care	274
inpatient care	274
minimally invasive procedures	357
pelvic imaging	26
preventive care	26
thoracic (chest) imaging	38
vaccines	26
X-rays	15

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	135
Female	201

**Ethnicity**
Non-Hispanic White	295
Black	0
Hispanic	0
Asian	19
Other	0
Native American	0

**Age**
From 65 to 74	135
From 75 to 84	135
85 and over	48
Less than 65	18

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2016

Hypertension	65
High Cholesterol	54
Stroke	4
Ischemic Heart Disease	31
Depression	15
Chronic Kidney Disease	33
Asthma	15
Osteoperosis	16
Atrial Fibrilation	14
Heart Failure	21
Chronic Obstructive Pulmonary Disease	13
Diabetes	29
Dementia	8
Cancer	51

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2017 were minimally invasive procedures, chemotherapy, biological response modifier (BRM) therapy and hospital care.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	23
biological response modifier (BRM) therapy	248
chemotherapy	248
CT scan	47
doctor visit	1181
hospital care	221
inpatient care	221
minimally invasive procedures	324
pelvic imaging	23
preventive care	35
thoracic (chest) imaging	24
vaccines	35

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	145
Female	200

**Ethnicity**
Non-Hispanic White	301
Black	0
Hispanic	0
Asian	17
Other	13
Native American	0

**Age**
From 65 to 74	134
From 75 to 84	134
85 and over	53
Less than 65	24

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2017

Hypertension	67
High Cholesterol	48
Stroke	6
Ischemic Heart Disease	34
Depression	16
Chronic Kidney Disease	36
Asthma	6
Osteoperosis	16
Atrial Fibrilation	12
Heart Failure	24
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	10
Cancer	50

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2018 were minimally invasive procedures, hospital care, inpatient care and chemotherapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	34
biological response modifier (BRM) therapy	253
chemotherapy	253
CT scan	68
doctor visit	1092
hospital care	370
inpatient care	370
minimally invasive procedures	378
pelvic imaging	34
port flush	18
preventive care	43
thoracic (chest) imaging	34
vaccines	43

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	156
Female	235

**Ethnicity**
Non-Hispanic White	332
Black	0
Hispanic	17
Asian	25
Other	0
Native American	0

**Age**
From 65 to 74	151
From 75 to 84	143
85 and over	68
Less than 65	29

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2018

Hypertension	66
High Cholesterol	57
Stroke	6
Ischemic Heart Disease	29
Depression	19
Chronic Kidney Disease	37
Asthma	7
Osteoperosis	14
Atrial Fibrilation	16
Heart Failure	21
Chronic Obstructive Pulmonary Disease	12
Diabetes	28
Dementia	8
Cancer	44

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2019 were hospital care, inpatient care, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	30
biological response modifier (BRM) therapy	254
chemotherapy	254
CT scan	62
doctor visit	1020
hospital care	518
inpatient care	518
minimally invasive procedures	351
pelvic imaging	30
port flush	21
preventive care	35
thoracic (chest) imaging	32
vaccines	35

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	173
Female	237

**Ethnicity**
Non-Hispanic White	348
Black	0
Hispanic	19
Asian	22
Other	0
Native American	0

**Age**
From 65 to 74	165
From 75 to 84	161
85 and over	60
Less than 65	24

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2019

Hypertension	68
High Cholesterol	56
Stroke	5
Ischemic Heart Disease	32
Depression	20
Chronic Kidney Disease	41
Asthma	8
Osteoperosis	13
Atrial Fibrilation	15
Heart Failure	31
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	10
Cancer	46

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2020 were minimally invasive procedures, hospital care, inpatient care and chemotherapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	18
biological response modifier (BRM) therapy	248
chemotherapy	248
CT scan	39
doctor visit	830
hospital care	265
inpatient care	265
minimally invasive procedures	334
pelvic imaging	18
preventive care	18
thoracic (chest) imaging	21
vaccines	18

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	103
Female	168

**Ethnicity**
Non-Hispanic White	234
Black	0
Hispanic	0
Asian	17
Other	0
Native American	0

**Age**
From 65 to 74	116
From 75 to 84	96
85 and over	43
Less than 65	16

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2020

Hypertension	66
High Cholesterol	56
Stroke	5
Ischemic Heart Disease	32
Depression	17
Chronic Kidney Disease	33
Asthma	7
Osteoperosis	15
Atrial Fibrilation	15
Heart Failure	24
Chronic Obstructive Pulmonary Disease	11
Diabetes	24
Dementia	10
Cancer	44

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2021 were hospital care, inpatient care, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	20
biological response modifier (BRM) therapy	237
chemotherapy	237
CT scan	42
doctor visit	821
hospital care	401
inpatient care	401
minimally invasive procedures	316
pelvic imaging	20
thoracic (chest) imaging	22

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	111
Female	168

**Ethnicity**
Non-Hispanic White	232
Black	0
Hispanic	0
Asian	18
Other	13
Native American	0

**Age**
From 65 to 74	116
From 75 to 84	108
85 and over	42
Less than 65	13

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2021

Hypertension	70
High Cholesterol	66
Stroke	6
Ischemic Heart Disease	37
Depression	21
Chronic Kidney Disease	39
Asthma	6
Osteoperosis	17
Atrial Fibrilation	18
Heart Failure	27
Chronic Obstructive Pulmonary Disease	14
Diabetes	31
Dementia	10
Cancer	46

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL during 2022 were hospital care, inpatient care, minimally invasive procedures and chemotherapy.

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

abdominal imaging	20
biological response modifier (BRM) therapy	134
chemotherapy	134
CT scan	54
doctor visit	742
hospital care	295
inpatient care	295
minimally invasive procedures	211
pelvic imaging	20
preventive care	18
thoracic (chest) imaging	34
vaccines	18

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	117
Female	175

**Ethnicity**
Non-Hispanic White	250
Black	0
Hispanic	0
Asian	19
Other	11
Native American	0

**Age**
From 65 to 74	130
From 75 to 84	112
85 and over	36
Less than 65	14

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2022

Hypertension	75
High Cholesterol	73
Stroke	10
Ischemic Heart Disease	26
Depression	18
Chronic Kidney Disease	31
Asthma	8
Osteoperosis	23
Atrial Fibrilation	24
Heart Failure	24
Chronic Obstructive Pulmonary Disease	16
Diabetes	33
Dementia	8
Cancer	50

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Leonard M. Klein, MD for Medicare patients.

The highest averages for the top procedures that Dr. Leonard M. Klein, MD treated as an oncologist in Niles, IL were minimally invasive procedures, inpatient care, hospital care and chemotherapy.

abdominal imaging	32
aspiration	17
biological response modifier (BRM) therapy	290
blood draw	20
bone marrow tests	25
chemotherapy	290
CT scan	71
diagnostic procedures	25
doctor visit	1301
hospital care	367
inpatient care	367
minimally invasive procedures	397
pelvic imaging	32
preventive care	32
radiation therapy	53
thoracic (chest) imaging	46
vaccines	32
X-rays	18

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Leonard M. Klein, MD.

**Gender**
Male	152
Female	210

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	18
Non-Hispanic White	319
Native American / Alaskan Native	0
Hispanic	3
Other	3

**Age**
75 to 84	140
85 and over	54
Less than 65	20
65 to 74	146

Average of Total of Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Leonard M. Klein, MD treated were hypertension, high cholesterol, cancer and chronic kidney disease.

Hypertension	61
High Cholesterol	52
Stroke	5
Ischemic Heart Disease	28
Depression	15
Chronic Kidney Disease	32
Asthma	6
Osteoporosis	13
Heart Failure	21
Chronic Obstructive Pulmonary Disease	12
Diabetes	26
Atrial Fibrillation	14
Dementia	7
Cancer	44

Education & Training

Dr. Leonard M. Klein, MD graduated from SUNY, University at Buffalo School of Medicine & Biomedical Sciences in 1978. He has a state license in Illinois.

Medical School: SUNY, University at Buffalo School of Medicine & Biomedical Sciences (1978)

Licensed In: Illinois

Affiliations & Hospitals

Dr. Leonard M. Klein, MD is associated with these hospitals and organizations:

ILLINOIS CANCER SPECIALISTS

Ratings & Reviews

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General Payments

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

**Payments by Company**
Seattle Genetics, Inc.	$2,698 ADCETRIS $2,698
Onyx Pharmaceuticals, Inc., an Amgen subsidiary	$657 Kyprolis $657
Pfizer Inc.	$523 IBRANCE $340	PAXLOVID $72	DAURISMO $32	BESPONSA $24	TALZENNA $22	Other $33
McKesson Specialty Care Distribution Corp.	$278 $278
Novartis Pharmaceuticals Corporation	$274 NON BRAND $101	TASIGNA $74	SCEMBLIX $39	VOTRIENT $29	PROMACTA $16	Other $14
Other	$1,519 MOZOBIL $174	SPYGLASS $140	RETEVMO $126	FOUNDATIONONE HEME $87	XARELTO $84	Other $908

**Types of Payments**
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$3,487
Food and Beverage	$1,808
Education	$312
Charitable Contribution	$278
Travel and Lodging	$65

Research Payments

Dr. Leonard M. Klein, MD has received 949 research payments totaling $3,233,090.

Biography

Dr. Leonard Klein is an adult hematology and adult oncology specialist in Niles, IL. He graduated from SUNY, University at Buffalo School of Medicine & Biomedical Sciences.

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Dr. Leonard M. Klein, MD

Office Locations

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. Leonard M. Klein, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Leonard M. Klein, 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. Leonard M. Klein, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Research Payments

Biography

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