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Dr. Gregory T. Maclennan, MD

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Specializes in: Hematopathology, Blood Banking & Transfusion Medicine, Dermatopathology, Chemical Pathology and Immunopathology

University of Manitoba Faculty of Medicine (1971)

Professional interests include: gynecologic cytology

11100 Euclid Avenue
Cleveland, OH 44106

(216) 844-7494

Dr. Gregory T. Maclennan, MD is a hematopathologist in Cleveland, OH specializing in hematopathology, blood banking & transfusion medicine, dermatopathology, chemical pathology and immunopathology. He graduated from University of Manitoba Faculty of Medicine in 1971 and has 55 years of experience. Dr. Gregory T. Maclennan, MD is affiliated with University Hospitals and UNIVERSITY HOSPITALS MEDICAL GROUP INC.

Office Locations

11100 Euclid Avenue
Cleveland, OH 44106

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Noteworthy Medicare Patient Procedures Performed by Dr. Gregory T. Maclennan, MD in 2023

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

Top 5%

By Volume:

cytology

non-gynecologic liquid-based cytology

By Affordability:

non-gynecologic liquid-based cytology

In 2023, among providers in related specialties within Ohio, Dr. Gregory T. Maclennan, MD performed more cytology, and non-gynecologic liquid-based cytology procedures for Medicare patients than 95% of them and he also had a list price for non-gynecologic liquid-based cytology 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:

immunohistochemistry test

By Affordability:

cytology

liquid-based cytology

non-gynecologic cytology

In 2012, among providers in related specialties within Ohio, Dr. Gregory T. Maclennan, MD performed more immunohistochemistry (IHC) test procedures for Medicare patients than 75% of them and he also had a list price for cytology, liquid-based cytology (ThinPrep), and non-gynecologic cytology 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 T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2012 were cytology, lab tests, consultation and second opinions.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

consultation	47
cytology	115
lab tests	100
second opinions	23

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2013 were lab tests, cytology, second opinions and consultation.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

consultation	22
cytology	137
lab tests	174
second opinions	37

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	213
Female	223

**Ethnicity**
Non-Hispanic White	340
Black	84
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	195
From 75 to 84	108
85 and over	37
Less than 65	96

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2013

Hypertension	75
High Cholesterol	58
Stroke	5
Ischemic Heart Disease	42
Depression	26
Chronic Kidney Disease	32
Asthma	9
Osteoperosis	5
Atrial Fibrilation	12
Heart Failure	23
Chronic Obstructive Pulmonary Disease	22
Diabetes	34
Dementia	9
Cancer	26

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2014 were lab tests, cytology, consultation and second opinions.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

consultation	36
cytology	89
lab tests	152
second opinions	35

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	302
Female	187

**Ethnicity**
Non-Hispanic White	389
Black	84
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	193
From 75 to 84	135
85 and over	66
Less than 65	95

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2014

Hypertension	75
High Cholesterol	61
Stroke	7
Ischemic Heart Disease	45
Depression	28
Chronic Kidney Disease	44
Asthma	10
Osteoperosis	4
Atrial Fibrilation	16
Heart Failure	28
Chronic Obstructive Pulmonary Disease	20
Diabetes	33
Dementia	8
Cancer	29

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2015 were cytology, lab tests, second opinions and consultation.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

consultation	27
cytology	47
lab tests	42
second opinions	34

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	336
Female	122

**Ethnicity**
Non-Hispanic White	358
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	210
From 75 to 84	154
85 and over	38
Less than 65	56

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2015

Hypertension	75
High Cholesterol	66
Stroke	0
Ischemic Heart Disease	48
Depression	22
Chronic Kidney Disease	50
Asthma	15
Osteoperosis	0
Atrial Fibrilation	16
Heart Failure	25
Chronic Obstructive Pulmonary Disease	24
Diabetes	34
Dementia	11
Cancer	39

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2016 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

cytology	269
lab tests	59
second opinions	22

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	240
Female	147

**Ethnicity**
Non-Hispanic White	292
Black	74
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	175
From 75 to 84	136
85 and over	32
Less than 65	44

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2016

Hypertension	75
High Cholesterol	62
Stroke	4
Ischemic Heart Disease	44
Depression	26
Chronic Kidney Disease	51
Asthma	27
Osteoperosis	5
Atrial Fibrilation	20
Heart Failure	27
Chronic Obstructive Pulmonary Disease	28
Diabetes	38
Dementia	11
Cancer	35

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2017 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

cytology	250
lab tests	81
second opinions	16

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	278
Female	135

**Ethnicity**
Non-Hispanic White	319
Black	62
Hispanic	0
Asian	0
Other	20
Native American	0

**Age**
From 65 to 74	196
From 75 to 84	128
85 and over	46
Less than 65	43

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2017

Hypertension	75
High Cholesterol	61
Stroke	6
Ischemic Heart Disease	49
Depression	25
Chronic Kidney Disease	51
Asthma	6
Osteoperosis	5
Atrial Fibrilation	18
Heart Failure	23
Chronic Obstructive Pulmonary Disease	25
Diabetes	32
Dementia	14
Cancer	36

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2018 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

cytology	113
lab tests	100
second opinions	12

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	330
Female	108

**Ethnicity**
Non-Hispanic White	361
Black	49
Hispanic	0
Asian	0
Other	17
Native American	0

**Age**
From 65 to 74	241
From 75 to 84	122
85 and over	40
Less than 65	35

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2018

Hypertension	74
High Cholesterol	64
Stroke	4
Ischemic Heart Disease	43
Depression	25
Chronic Kidney Disease	47
Asthma	6
Osteoperosis	4
Atrial Fibrilation	14
Heart Failure	21
Chronic Obstructive Pulmonary Disease	22
Diabetes	29
Dementia	10
Cancer	37

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2019 were cytology, lab tests and second opinions.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

cytology	188
lab tests	98
second opinions	17

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	328
Female	143

**Ethnicity**
Non-Hispanic White	393
Black	50
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	252
From 75 to 84	148
85 and over	40
Less than 65	31

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2019

Hypertension	75
High Cholesterol	69
Stroke	6
Ischemic Heart Disease	45
Depression	27
Chronic Kidney Disease	46
Asthma	9
Osteoperosis	6
Atrial Fibrilation	15
Heart Failure	22
Chronic Obstructive Pulmonary Disease	22
Diabetes	31
Dementia	8
Cancer	36

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2020 were cytology and lab tests.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

cytology	238
lab tests	108

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	275
Female	134

**Ethnicity**
Non-Hispanic White	341
Black	41
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	196
From 75 to 84	134
85 and over	45
Less than 65	34

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2020

Hypertension	75
High Cholesterol	70
Stroke	5
Ischemic Heart Disease	53
Depression	29
Chronic Kidney Disease	49
Asthma	7
Osteoperosis	5
Atrial Fibrilation	17
Heart Failure	26
Chronic Obstructive Pulmonary Disease	27
Diabetes	37
Dementia	10
Cancer	35

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2021 were cytology and lab tests.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

cytology	243
lab tests	108

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	320
Female	142

**Ethnicity**
Non-Hispanic White	394
Black	34
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	226
From 75 to 84	157
85 and over	48
Less than 65	31

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2021

Hypertension	75
High Cholesterol	73
Stroke	6
Ischemic Heart Disease	52
Depression	27
Chronic Kidney Disease	51
Asthma	8
Osteoperosis	5
Atrial Fibrilation	19
Heart Failure	25
Chronic Obstructive Pulmonary Disease	23
Diabetes	34
Dementia	8
Cancer	33

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH during 2022 were cytology and lab tests.

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

cytology	232
lab tests	154

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	297
Female	150

**Ethnicity**
Non-Hispanic White	378
Black	39
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	220
From 75 to 84	149
85 and over	53
Less than 65	25

Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	38
Depression	26
Chronic Kidney Disease	31
Asthma	9
Osteoperosis	8
Atrial Fibrilation	21
Heart Failure	17
Chronic Obstructive Pulmonary Disease	23
Diabetes	33
Dementia	9
Cancer	38

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Gregory T. Maclennan, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregory T. Maclennan, MD treated as a hematopathologist in Cleveland, OH were cytology, lab tests, consultation and second opinions.

consultation	33
cytology	174
lab tests	106
second opinions	24

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Gregory T. Maclennan, MD.

**Gender**
Male	265
Female	135

**Ethnicity**
Black / African American	47
Asian / Pacific Islander	0
Non-Hispanic White	324
Native American / Alaskan Native	0
Hispanic	0
Other	3

**Age**
75 to 84	124
85 and over	40
Less than 65	44
65 to 74	191

Average of Total of Conditions of Medicare patients treated by Dr. Gregory T. Maclennan, MD From 2012 - 2022

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

Hypertension	68
High Cholesterol	59
Stroke	4
Ischemic Heart Disease	41
Depression	23
Chronic Kidney Disease	41
Asthma	9
Osteoporosis	4
Heart Failure	21
Chronic Obstructive Pulmonary Disease	21
Diabetes	30
Atrial Fibrillation	15
Dementia	8
Cancer	31

Education & Training

Dr. Gregory T. Maclennan, MD graduated from University of Manitoba Faculty of Medicine in 1971. He completed residency at University of Manitoba Affiliated Hospitals. He is certified by the Cytopathology - American Board of Pathology and has a state license in Ohio.

Medical School: University of Manitoba Faculty of Medicine (1971)

Residency: University of Manitoba Affiliated Hospitals (1993)

Board Certification: Cytopathology - American Board of Pathology

Licensed In: Ohio

Affiliations & Hospitals

Dr. Gregory T. Maclennan, MD is associated with these hospitals and organizations:

University Hospitals

UNIVERSITY HOSPITALS MEDICAL GROUP INC

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Biography

Dr. Gregory Maclennan is a specialist in immunopathology, chemical pathology, and forensic pathology. Areas of particular interest for Dr. Maclennan include gynecologic cytology. Dr. Maclennan is professionally affiliated with the University Hospitals. He attended the University of Manitoba Faculty of Medicine and then went on to complete his residency at a hospital affiliated with the University of Manitoba.