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Dr. Mark P. Diehl, DO

Accepting New Patients

(256 Ratings)

Specializes in: Adult Rheumatology

Philadelphia College of Osteopathic Medicine

40 V - Twin Drive
Gettysburg, PA 17325

(717) 339-2790

Dr. Mark P. Diehl, DO is a rheumatologist in Gettysburg, PA specializing in adult rheumatology. He graduated from Philadelphia College of Osteopathic Medicine. Dr. Mark P. Diehl, DO is affiliated with WellSpan Health.

Office Locations

40 V - Twin Drive
Gettysburg, PA 17325

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97 Progress Boulevard
Shippensburg, PA 17257

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Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2012 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	55
doctor visit	750
injections	55

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2013 were aspiration, injections, hospital care and inpatient care.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	48
doctor visit	753
hospital care	13
injections	48
inpatient care	13

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	99
Female	322

**Ethnicity**
Non-Hispanic White	403
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	168
From 75 to 84	112
85 and over	48
Less than 65	93

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2013

Hypertension	67
High Cholesterol	61
Stroke	4
Ischemic Heart Disease	27
Depression	24
Chronic Kidney Disease	18
Asthma	12
Osteoperosis	28
Atrial Fibrilation	10
Heart Failure	13
Chronic Obstructive Pulmonary Disease	14
Diabetes	26
Dementia	5
Cancer	4

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2014 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	43
doctor visit	709
injections	43

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	105
Female	328

**Ethnicity**
Non-Hispanic White	405
Black	14
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	178
From 75 to 84	110
85 and over	39
Less than 65	106

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2014

Hypertension	64
High Cholesterol	63
Stroke	4
Ischemic Heart Disease	28
Depression	23
Chronic Kidney Disease	19
Asthma	10
Osteoperosis	24
Atrial Fibrilation	10
Heart Failure	15
Chronic Obstructive Pulmonary Disease	15
Diabetes	25
Dementia	4
Cancer	9

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2015 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	38
doctor visit	739
injections	38

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	204
Female	686

**Ethnicity**
Non-Hispanic White	850
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	380
From 75 to 84	230
85 and over	76
Less than 65	204

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2015

Hypertension	64
High Cholesterol	62
Stroke	6
Ischemic Heart Disease	28
Depression	25
Chronic Kidney Disease	21
Asthma	17
Osteoperosis	27
Atrial Fibrilation	10
Heart Failure	14
Chronic Obstructive Pulmonary Disease	15
Diabetes	25
Dementia	4
Cancer	8

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2016 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	51
doctor visit	712
injections	51

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	114
Female	328

**Ethnicity**
Non-Hispanic White	419
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	195
From 75 to 84	100
85 and over	37
Less than 65	110

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2016

Hypertension	66
High Cholesterol	61
Stroke	5
Ischemic Heart Disease	31
Depression	26
Chronic Kidney Disease	26
Asthma	25
Osteoperosis	25
Atrial Fibrilation	12
Heart Failure	16
Chronic Obstructive Pulmonary Disease	19
Diabetes	30
Dementia	4
Cancer	9

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2017 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	46
doctor visit	749
injections	46

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	123
Female	381

**Ethnicity**
Non-Hispanic White	487
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	229
From 75 to 84	113
85 and over	45
Less than 65	117

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2017

Hypertension	65
High Cholesterol	54
Stroke	5
Ischemic Heart Disease	29
Depression	29
Chronic Kidney Disease	26
Asthma	14
Osteoperosis	29
Atrial Fibrilation	11
Heart Failure	13
Chronic Obstructive Pulmonary Disease	16
Diabetes	29
Dementia	5
Cancer	9

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2018 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	48
doctor visit	752
injections	48

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	129
Female	363

**Ethnicity**
Non-Hispanic White	469
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	225
From 75 to 84	118
85 and over	44
Less than 65	105

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2018

Hypertension	70
High Cholesterol	66
Stroke	6
Ischemic Heart Disease	28
Depression	27
Chronic Kidney Disease	27
Asthma	13
Osteoperosis	29
Atrial Fibrilation	11
Heart Failure	13
Chronic Obstructive Pulmonary Disease	16
Diabetes	32
Dementia	6
Cancer	9

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2019 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	37
doctor visit	749
injections	37

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	142
Female	404

**Ethnicity**
Non-Hispanic White	518
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	246
From 75 to 84	140
85 and over	42
Less than 65	118

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2019

Hypertension	68
High Cholesterol	0
Stroke	5
Ischemic Heart Disease	32
Depression	30
Chronic Kidney Disease	28
Asthma	14
Osteoperosis	34
Atrial Fibrilation	11
Heart Failure	17
Chronic Obstructive Pulmonary Disease	14
Diabetes	27
Dementia	5
Cancer	10

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2020 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	24
doctor visit	609
injections	24

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	126
Female	344

**Ethnicity**
Non-Hispanic White	443
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	242
From 75 to 84	110
85 and over	30
Less than 65	88

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2020

Hypertension	65
High Cholesterol	69
Stroke	4
Ischemic Heart Disease	29
Depression	30
Chronic Kidney Disease	29
Asthma	10
Osteoperosis	33
Atrial Fibrilation	10
Heart Failure	15
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	5
Cancer	9

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2021 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	28
doctor visit	769
injections	28

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	144
Female	408

**Ethnicity**
Non-Hispanic White	528
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	274
From 75 to 84	144
85 and over	43
Less than 65	91

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2021

Hypertension	68
High Cholesterol	67
Stroke	4
Ischemic Heart Disease	31
Depression	28
Chronic Kidney Disease	31
Asthma	10
Osteoperosis	35
Atrial Fibrilation	10
Heart Failure	16
Chronic Obstructive Pulmonary Disease	11
Diabetes	28
Dementia	6
Cancer	10

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA during 2022 were aspiration and injections.

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

aspiration	29
doctor visit	759
injections	29

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Male	153
Female	411

**Ethnicity**
Non-Hispanic White	539
Black	0
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	286
From 75 to 84	164
85 and over	43
Less than 65	71

Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO in 2022

Hypertension	74
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	27
Depression	27
Chronic Kidney Disease	26
Asthma	14
Osteoperosis	42
Atrial Fibrilation	17
Heart Failure	16
Chronic Obstructive Pulmonary Disease	16
Diabetes	31
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Mark P. Diehl, DO for Medicare patients.

The highest averages for the top procedures that Dr. Mark P. Diehl, DO treated as a rheumatologist in Gettysburg, PA were aspiration, injections, hospital care and inpatient care.

aspiration	40
doctor visit	731
hospital care	13
injections	40
inpatient care	13

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Mark P. Diehl, DO.

**Gender**
Female	361
Male	121

**Ethnicity**
Black / African American	1
Asian / Pacific Islander	0
Non-Hispanic White	460
Hispanic	0
Native American / Alaskan Native	0
Other	1

**Age**
85 and over	40
75 to 84	121
Less than 65	100
65 to 74	220

Average of Total of Conditions of Medicare patients treated by Dr. Mark P. Diehl, DO From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Mark P. Diehl, DO treated were hypertension, high cholesterol, osteoperosis and ischemic heart disease.

Hypertension	61
High Cholesterol	52
Stroke	4
Ischemic Heart Disease	26
Depression	24
Chronic Kidney Disease	22
Asthma	12
Osteoporosis	27
Heart Failure	13
Chronic Obstructive Pulmonary Disease	13
Diabetes	25
Atrial Fibrillation	10
Dementia	4
Cancer	8

Education & Training

Dr. Mark P. Diehl, DO graduated from Philadelphia College of Osteopathic Medicine. He completed residency at University of Pittsburgh Medical Center (UPMC). He is certified by the American Osteopathic Board of Internal Medicine | Rheumatology and has a state license in Pennsylvania.

Medical School: Philadelphia College of Osteopathic Medicine

Residency: University of Pittsburgh Medical Center (UPMC)

Board Certification: American Osteopathic Board of Internal Medicine | Rheumatology

Licensed In: Pennsylvania

Affiliations & Hospitals

Dr. Mark P. Diehl, DO is associated with these hospitals and organizations:

WellSpan Health

Insurance Information

Please note: Insurance information may change at any time, and the provider may accept your insurance plan even if it is not listed below. Please contact the provider's office to confirm that your insurance is accepted.

Dr. Mark P. Diehl, DO appears to accept the following insurance providers: AmeriHealth, Highmark Blue Shield, United Healthcare, Aetna, TRICARE, Medicare, Medicaid, Railroad Medicare, Cigna, Capital BlueCross, Centene, Geisinger Health Plan, Highmark Wholecare (formerly Gateway), US - Department of Labor, Johns Hopkins Health Care, UPMC Health Plan, Preferred Health Care, Jefferson Health Plans (formerly HPP), Aetna Better Health, WellSpan Population Health (formerly SCP) and Devoted Health.

Insurance Accepted by Provider includes:

According to our sources, Dr. Mark P. Diehl, DO accepts the following insurance providers:

AmeriHealth

Highmark Blue Shield

United Healthcare

Aetna

TRICARE

Medicare

Medicaid

Railroad Medicare

Cigna

Capital BlueCross

Centene

Geisinger Health Plan

Highmark Wholecare (formerly Gateway)

US - Department of Labor

Johns Hopkins Health Care

UPMC Health Plan

Preferred Health Care

Jefferson Health Plans (formerly HPP)

Aetna Better Health

WellSpan Population Health (formerly SCP)

Devoted Health

Ratings & Reviews

Dr. Mark P. Diehl, DO has an exceptional overall rating with an average of 4.91 out of 5 stars based on 256 ratings. We collect ratings and reviews of Dr. Mark P. Diehl, DO from all over the web to help you find the right in Gettysburg, PA.

4.91

Overall Rating

(256 Ratings)

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Reviews From Around The Web

Overall Rating: 5.0 2026-02-02

Patient verified via Press Ganey

Dr. Diehl is always very kind and takes the time to listen to any issues or concerns I have about my health. He makes me feel heard and really seems to care about his patients.

Overall Rating: 5.0 2025-09-29

Patient verified via Press Ganey

He has always been very friendly

Overall Rating: 5.0 2026-02-21

Patient verified via Press Ganey

No problem.

Overall Rating: 5.0 2025-11-07

Patient verified via Press Ganey

Great visit

Overall Rating: 5.0 2026-01-26

Patient verified via Press Ganey

Excellent!

General Payments

These charts describe general payments received by Dr. Mark P. Diehl, DO. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Amgen Inc.	$218,810 Enbrel $121,333	Prolia $66,288	EVENITY $11,731	Otezla $1,221	Tavneos $63	Other $18,173
Questcor Pharmaceuticals	$37,176 ACTHAR $21,818	ACTHAR- RHEUM $15,358
Mallinckrodt LLC	$28,902 ACTHAR $28,902
Lilly USA, LLC	$298 OLUMIANT $132	TALTZ $100	$66
AstraZeneca Pharmaceuticals LP	$285 SAPHNELO $285
Other	$1,718 COSENTYX $244	XELJANZ $230	Tremfya $224	BENLYSTA $224	Cimzia $147	Other $649

**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	$229,169
Honoraria	$29,842
Travel and Lodging	$13,729
Food and Beverage	$11,728
Consulting Fee	$2,500
Other	$223

Biography

Dr. Mark Diehl is a specialist in adult rheumatology in Gettysburg, PA and Shippensburg, PA. In addition to English, he speaks German. Dr. Diehl's professional affiliations include WellSpan Medical Group, WellSpan Gettysburg Hospital, and WellSpan York Hospital. He graduated from Philadelphia College of Osteopathic Medicine. For his professional training, Dr. Diehl completed a residency program at the University of Pittsburgh Medical Center (UPMC). On average, patients gave him a rating of 5.0 stars (out of 5). He can take Capital BlueCross, Blue California, Aetna, and more. According to WellSpan Health, new patients are welcome to contact his office in Gettysburg, PA.