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Dr. Daniel Leonard Griffen III, MD

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Specializes in: Cardiac Electrophysiology (Heart Rhythm) and Adult Cardiology

University of Iowa, Carver College of Medicine (1982)

Professional interests include: heart problems

12501 Prosperity Drive Suite 300
Silver Spring, MD 20904

(301) 634-4800

Dr. Daniel Leonard Griffen III, MD is a cardiac electrophysiologist in ROCKVILLE, MD specializing in cardiac electrophysiology (heart rhythm) and adult cardiology. He graduated from University of Iowa, Carver College of Medicine in 1982 and has 44 years of experience. Dr. Daniel Leonard Griffen III, MD is affiliated with Holy Cross Health.

Office Locations

15225 SHADY GROVE ROAD SUITE 201
ROCKVILLE, MD 20850

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Holy Cross Health

12501 Prosperity Drive Suite 300
Silver Spring, MD 20904

(301) 634-4800

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Holy Cross Health

19735 Germantown Road Suite 190
Germantown, MD 20874

(240) 449-1100

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Some issues Dr. Daniel Leonard Griffen III, MD can help you with:

Heart Problems

The heart is one of the most important organs in the body. This smooth muscle expands and contracts rhythmically an entire lifetime, pumping blood to the lungs and then to every other cell in the body. When heart problems occur, it becomes difficult for the body to get the nutrients and oxygen it needs via the blood. So while there are a variety of illnesses and disorders that affect the heart, most of them cause weakness, exhaustion and shortness of breath. The most common heart conditions include heart disease, angina, arrhythmia, and valve disorders.

Heart disease is the leading cause of death in the United States for both men and women. This includes coronary artery disease, heart attacks, congestive heart failure, and congenital heart disease. Some conditions, such as genetics, cannot be controlled. But there are many other things one can do to lower their risk for heart disease. Controlling high blood pressure and cholesterol levels, reducing or stopping smoking, exercising more and losing weight if needed, and eating a diet low in sodium can all protect the heart.

Angina is a squeezing type of chest pain that happens when the muscles around the heart don't get enough oxygen. It can be regular or infrequent. Usually, angina is caused by coronary heart disease. However, not all chest pain is angina. Chest pain can also be caused by a lung infection or panic attack, for example, so it is important to have any sudden pain checked.

Arrhythmia is the word for when the heart beats too fast, too slow, or irregularly with skipped beats. It can feel frightening, and depending on the type it can be dangerous, but in most cases arrhythmia is not serious and can be treated. It is very common, especially in older adults.

Heart valve problems can happen in any one of the the heart's four valves that keep blood flowing where it needs to go. Babies can be born with problems in their heart valves, or valves can be damaged by infections. The valves can stiffen and become less mobile, or they can stop closing properly and 'leak' when the heart beats. Valve problems can usually be repaired surgically.

Noteworthy Medicare Patient Procedures Performed by Dr. Daniel Leonard Griffen III, MD in 2023

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

Top 5%

By Volume:

Doppler echocardiography

echocardiogram

ultrasound

In 2023, Dr. Daniel Leonard Griffen III, MD performed more Doppler echocardiography, echocardiogram (echo), and ultrasound (sonogram) procedures for Medicare patients than 95% of providers in related specialties within Maryland.

Top 25%

By Affordability:

hospital care

inpatient care

inpatient hospital care

In 2012, Dr. Daniel Leonard Griffen III, MD had a list price for hospital care, inpatient care, and inpatient hospital care (for patient admitted to hospital) that was lower than the list prices billed to Medicare by 75% of providers in related specialties within Maryland. 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. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2012 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

ambulatory monitoring	104
cardiac procedures	1449
doctor visit	2564
hospital care	462
inpatient care	462
nuclear scan	30
stress testing	210
ultrasound (sonogram)	1278

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2013 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

ambulatory monitoring	108
cardiac procedures	1769
doctor visit	2620
hospital care	503
inpatient care	503
minimally invasive procedures	20
nuclear scan	21
stress testing	195
ultrasound (sonogram)	1614

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1281
Female	1493

**Ethnicity**
Non-Hispanic White	1962
Black	423
Hispanic	107
Asian	229
Other	0
Native American	0

**Age**
From 65 to 74	955
From 75 to 84	983
85 and over	626
Less than 65	210

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2013

Hypertension	75
High Cholesterol	75
Stroke	13
Ischemic Heart Disease	55
Depression	21
Chronic Kidney Disease	34
Asthma	10
Osteoperosis	12
Atrial Fibrilation	24
Heart Failure	32
Chronic Obstructive Pulmonary Disease	17
Diabetes	38
Dementia	18
Cancer	13

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2014 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

ambulatory monitoring	93
cardiac procedures	1836
doctor visit	2449
hospital care	422
inpatient care	422
nuclear scan	40
stress testing	253
ultrasound (sonogram)	1642

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1308
Female	1528

**Ethnicity**
Non-Hispanic White	1950
Black	400
Hispanic	130
Asian	280
Other	0
Native American	0

**Age**
From 65 to 74	1039
From 75 to 84	966
85 and over	609
Less than 65	222

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2014

Hypertension	75
High Cholesterol	74
Stroke	13
Ischemic Heart Disease	54
Depression	22
Chronic Kidney Disease	34
Asthma	10
Osteoperosis	11
Atrial Fibrilation	25
Heart Failure	33
Chronic Obstructive Pulmonary Disease	18
Diabetes	37
Dementia	19
Cancer	14

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2015 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

ambulatory monitoring	97
cardiac procedures	2098
doctor visit	2374
hospital care	438
inpatient care	438
minimally invasive procedures	12
nuclear scan	51
stress testing	253
ultrasound (sonogram)	1861

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	2800
Female	3396

**Ethnicity**
Non-Hispanic White	4120
Black	918
Hispanic	302
Asian	674
Other	0
Native American	0

**Age**
From 65 to 74	2178
From 75 to 84	2090
85 and over	1392
Less than 65	536

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2015

Hypertension	75
High Cholesterol	74
Stroke	14
Ischemic Heart Disease	58
Depression	25
Chronic Kidney Disease	39
Asthma	15
Osteoperosis	11
Atrial Fibrilation	26
Heart Failure	36
Chronic Obstructive Pulmonary Disease	19
Diabetes	39
Dementia	21
Cancer	13

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2016 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

ambulatory monitoring	72
cardiac procedures	2357
doctor visit	2455
hospital care	518
inpatient care	518
nuclear scan	50
stress testing	267
ultrasound (sonogram)	2115

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1519
Female	1833

**Ethnicity**
Non-Hispanic White	2183
Black	515
Hispanic	162
Asian	386
Other	0
Native American	0

**Age**
From 65 to 74	1120
From 75 to 84	1201
85 and over	769
Less than 65	262

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2016

Hypertension	75
High Cholesterol	74
Stroke	14
Ischemic Heart Disease	67
Depression	24
Chronic Kidney Disease	43
Asthma	21
Osteoperosis	11
Atrial Fibrilation	23
Heart Failure	37
Chronic Obstructive Pulmonary Disease	18
Diabetes	41
Dementia	22
Cancer	13

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2017 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

ambulatory monitoring	50
cardiac procedures	2207
doctor visit	2364
hospital care	398
inpatient care	398
stress testing	163
ultrasound (sonogram)	2075

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1461
Female	1835

**Ethnicity**
Non-Hispanic White	2130
Black	506
Hispanic	161
Asian	379
Other	0
Native American	0

**Age**
From 65 to 74	1136
From 75 to 84	1188
85 and over	711
Less than 65	261

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2017

Hypertension	75
High Cholesterol	66
Stroke	14
Ischemic Heart Disease	62
Depression	26
Chronic Kidney Disease	44
Asthma	10
Osteoperosis	11
Atrial Fibrilation	25
Heart Failure	38
Chronic Obstructive Pulmonary Disease	17
Diabetes	40
Dementia	20
Cancer	13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2018 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

ambulatory monitoring	24
cardiac procedures	2569
doctor visit	2449
hospital care	462
inpatient care	462
stress testing	169
ultrasound (sonogram)	2452

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1676
Female	1990

**Ethnicity**
Non-Hispanic White	2299
Black	550
Hispanic	207
Asian	462
Other	0
Native American	0

**Age**
From 65 to 74	1277
From 75 to 84	1309
85 and over	797
Less than 65	283

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2018

Hypertension	75
High Cholesterol	75
Stroke	16
Ischemic Heart Disease	60
Depression	27
Chronic Kidney Disease	44
Asthma	10
Osteoperosis	11
Atrial Fibrilation	25
Heart Failure	39
Chronic Obstructive Pulmonary Disease	16
Diabetes	42
Dementia	22
Cancer	14

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2019 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

ambulatory monitoring	30
cardiac procedures	2938
doctor visit	2325
hospital care	630
inpatient care	630
minimally invasive procedures	11
stress testing	136
ultrasound (sonogram)	2840

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1828
Female	2220

**Ethnicity**
Non-Hispanic White	2562
Black	576
Hispanic	251
Asian	488
Other	0
Native American	0

**Age**
From 65 to 74	1361
From 75 to 84	1484
85 and over	923
Less than 65	280

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2019

Hypertension	75
High Cholesterol	75
Stroke	15
Ischemic Heart Disease	61
Depression	27
Chronic Kidney Disease	46
Asthma	9
Osteoperosis	11
Atrial Fibrilation	24
Heart Failure	38
Chronic Obstructive Pulmonary Disease	17
Diabetes	39
Dementia	24
Cancer	14

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2020 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

cardiac procedures	2737
doctor visit	2019
hospital care	432
inpatient care	432
stress testing	129
ultrasound (sonogram)	2688

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1859
Female	2036

**Ethnicity**
Non-Hispanic White	2448
Black	568
Hispanic	272
Asian	447
Other	0
Native American	0

**Age**
From 65 to 74	1351
From 75 to 84	1374
85 and over	858
Less than 65	312

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2020

Hypertension	75
High Cholesterol	75
Stroke	14
Ischemic Heart Disease	59
Depression	29
Chronic Kidney Disease	46
Asthma	10
Osteoperosis	11
Atrial Fibrilation	24
Heart Failure	34
Chronic Obstructive Pulmonary Disease	15
Diabetes	40
Dementia	23
Cancer	12

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2021 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

cardiac procedures	3152
doctor visit	2237
hospital care	468
inpatient care	468
stress testing	97
ultrasound (sonogram)	3103

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1953
Female	2210

**Ethnicity**
Non-Hispanic White	2618
Black	570
Hispanic	256
Asian	507
Other	0
Native American	0

**Age**
From 65 to 74	1437
From 75 to 84	1555
85 and over	933
Less than 65	238

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	16
Ischemic Heart Disease	59
Depression	26
Chronic Kidney Disease	45
Asthma	9
Osteoperosis	11
Atrial Fibrilation	25
Heart Failure	34
Chronic Obstructive Pulmonary Disease	13
Diabetes	39
Dementia	23
Cancer	13

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD during 2022 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

cardiac procedures	3251
doctor visit	2210
hospital care	488
inpatient care	488
stress testing	85
ultrasound (sonogram)	3224

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	2365
Female	2847

**Ethnicity**
Non-Hispanic White	3244
Black	755
Hispanic	352
Asian	617
Other	0
Native American	0

**Age**
From 65 to 74	1703
From 75 to 84	1891
85 and over	1278
Less than 65	340

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	22
Ischemic Heart Disease	45
Depression	27
Chronic Kidney Disease	31
Asthma	12
Osteoperosis	17
Atrial Fibrilation	32
Heart Failure	29
Chronic Obstructive Pulmonary Disease	17
Diabetes	40
Dementia	18
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Daniel Leonard Griffen III, MD for Medicare patients.

The highest averages for the top procedures that Dr. Daniel Leonard Griffen III, MD treated as a cardiac electrophysiologist in ROCKVILLE, MD were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

ambulatory monitoring	72
cardiac procedures	2396
doctor visit	2369
hospital care	474
inpatient care	474
minimally invasive procedures	14
nuclear scan	38
stress testing	177
ultrasound (sonogram)	2262

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Daniel Leonard Griffen III, MD.

**Gender**
Male	1640
Female	1944

**Ethnicity**
Black / African American	525
Asian / Pacific Islander	406
Non-Hispanic White	2319
Native American / Alaskan Native	0
Hispanic	200
Other	0

**Age**
75 to 84	1276
85 and over	808
Less than 65	267
65 to 74	1232

Average of Total of Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Daniel Leonard Griffen III, MD treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	68
High Cholesterol	67
Stroke	13
Ischemic Heart Disease	52
Depression	23
Chronic Kidney Disease	36
Asthma	10
Osteoporosis	10
Heart Failure	31
Chronic Obstructive Pulmonary Disease	15
Diabetes	35
Atrial Fibrillation	23
Dementia	19
Cancer	12

Education & Training

Dr. Daniel Leonard Griffen III, MD graduated from University of Iowa, Carver College of Medicine in 1982. He completed residency at Duke University Hospital. He is certified by the American Board of Internal Medicine: Cardiovascular Disease and has a state license in Maryland.

Medical School: University of Iowa, Carver College of Medicine (1982)

Residency: Duke University Hospital

Board Certification: American Board of Internal Medicine: Cardiovascular Disease

Licensed In: Maryland

Affiliations & Hospitals

Dr. Daniel Leonard Griffen III, MD is associated with these hospitals and organizations:

Holy Cross Health

Ratings & Reviews

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General Payments

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

**Payments by Company**
Janssen Pharmaceuticals, Inc	$1,397 XARELTO $1,280	INVOKANA $117
Amgen Inc.	$1,341 Repatha $1,170	Corlanor $103	$69
Gilead Sciences Inc	$1,019 Ranexa $450	$568
AstraZeneca Pharmaceuticals LP	$958 BRILINTA $698	FARXIGA $213	CRESTOR $47
E.R. Squibb & Sons, L.L.C.	$730 ELIQUIS $636	CAMZYOS $94
Other	$5,805 Vascepa $804	ENTRESTO $546	VERQUVO $381	PRALUENT $367	NEXLETOL $313	Other $3,394

**Types of Payments**
Food and Beverage	$11,104
Education	$147

Biography

Dr. Daniel Griffen is an adult cardiology and cardiac electrophysiology (heart rhythm) specialist in Rockville, MD, Silver Spring, MD, and Germantown, MD. Dr. Griffen's clinical interests include heart problems and internal medicine. He studied medicine at the University of Iowa, Carver College of Medicine and Baylor College of Medicine. For his professional training, Dr. Griffen completed residency programs at Duke University Hospital and National Naval Medical Center. He is professionally affiliated with Holy Cross Health. Dr. Griffen has an open panel in ROCKVILLE, MD according to Doctor.com.

Select Year:

Dr. Daniel Leonard Griffen III, MD

Office Locations

Some issues Dr. Daniel Leonard Griffen III, MD can help you with:

Noteworthy Medicare Patient Procedures Performed by Dr. Daniel Leonard Griffen III, MD in 2023

By Volume:

By Affordability:

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. Daniel Leonard Griffen III, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Daniel Leonard Griffen III, 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. Daniel Leonard Griffen III, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

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