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Home > CA Providers > Internists & Internal Medicine Doctors

Dr. John Frederick Shield, MD

(3 Ratings)

Specializes in: Internal Medicine (Adult Medicine)

690 Guzzi Lane Suite A
Sonora, CA 95370

(209) 536-5070

Dr. John Frederick Shield, MD is an internist in Sonora, CA specializing in internal medicine (adult medicine).

Office Locations

690 Guzzi Lane Suite A
Sonora, CA 95370

(209) 536-5070

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Noteworthy Medicare Patient Procedures Performed by Dr. John Frederick Shield, MD in 2023

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

Top 5%

By Volume:

pulmonary function test

By Affordability:

lung volume test

In 2023, among providers in related specialties within California, Dr. John Frederick Shield, MD performed more pulmonary function test (PFT) procedures for Medicare patients than 95% of them and he also had a list price for lung volume 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 10%

By Affordability:

lung diffusion capacity test

pulmonary function test

pulmonary testing

In 2023, Dr. John Frederick Shield, MD had a list price for lung diffusion capacity test (DLCO), pulmonary function test (PFT), and pulmonary testing that was lower than the list prices billed to Medicare by 90% of providers in related specialties within California. 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. John Frederick Shield, MD treated as an internist in Sonora, CA during 2012 were removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	1903
removal of lesion (e.g. growth)	39
skin procedures	39

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2013 were pulmonary testing, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	2002
pulmonary testing	57
removal of lesion (e.g. growth)	40
skin procedures	40

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	315
Female	333

**Ethnicity**
Non-Hispanic White	608
Black	0
Hispanic	28
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	295
From 75 to 84	232
85 and over	85
Less than 65	36

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2013

Hypertension	75
High Cholesterol	53
Stroke	3
Ischemic Heart Disease	27
Depression	13
Chronic Kidney Disease	21
Asthma	15
Osteoperosis	8
Atrial Fibrilation	10
Heart Failure	22
Chronic Obstructive Pulmonary Disease	24
Diabetes	21
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2014 were pulmonary testing, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	2051
pulmonary testing	394
removal of lesion (e.g. growth)	27
skin procedures	27

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	385
Female	372

**Ethnicity**
Non-Hispanic White	715
Black	0
Hispanic	31
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	355
From 75 to 84	260
85 and over	95
Less than 65	47

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2014

Hypertension	75
High Cholesterol	40
Stroke	1
Ischemic Heart Disease	27
Depression	15
Chronic Kidney Disease	18
Asthma	14
Osteoperosis	6
Atrial Fibrilation	12
Heart Failure	19
Chronic Obstructive Pulmonary Disease	27
Diabetes	20
Dementia	6
Cancer	12

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2015 were pulmonary testing, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	1954
pulmonary testing	418
removal of lesion (e.g. growth)	37
skin procedures	37

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	768
Female	780

**Ethnicity**
Non-Hispanic White	1464
Black	0
Hispanic	50
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	704
From 75 to 84	554
85 and over	196
Less than 65	94

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2015

Hypertension	75
High Cholesterol	47
Stroke	4
Ischemic Heart Disease	28
Depression	20
Chronic Kidney Disease	18
Asthma	26
Osteoperosis	8
Atrial Fibrilation	13
Heart Failure	18
Chronic Obstructive Pulmonary Disease	31
Diabetes	22
Dementia	6
Cancer	11

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2016 were pulmonary testing, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	1799
pulmonary testing	512
removal of lesion (e.g. growth)	17
skin procedures	17

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	400
Female	434

**Ethnicity**
Non-Hispanic White	788
Black	0
Hispanic	27
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	367
From 75 to 84	320
85 and over	97
Less than 65	50

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2016

Hypertension	75
High Cholesterol	50
Stroke	2
Ischemic Heart Disease	28
Depression	16
Chronic Kidney Disease	18
Asthma	38
Osteoperosis	7
Atrial Fibrilation	14
Heart Failure	17
Chronic Obstructive Pulmonary Disease	30
Diabetes	19
Dementia	6
Cancer	11

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2017 were pulmonary testing, removal of lesion (e.g. growth), skin procedures and ear procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	1906
ear procedures	14
pulmonary testing	490
removal of lesion (e.g. growth)	21
skin procedures	21

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	436
Female	399

**Ethnicity**
Non-Hispanic White	792
Black	0
Hispanic	25
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	358
From 75 to 84	324
85 and over	97
Less than 65	56

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2017

Hypertension	74
High Cholesterol	44
Stroke	3
Ischemic Heart Disease	27
Depression	15
Chronic Kidney Disease	19
Asthma	13
Osteoperosis	6
Atrial Fibrilation	13
Heart Failure	16
Chronic Obstructive Pulmonary Disease	27
Diabetes	20
Dementia	6
Cancer	12

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2018 were pulmonary testing.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	2051
pulmonary testing	626

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	466
Female	435

**Ethnicity**
Non-Hispanic White	848
Black	0
Hispanic	35
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	387
From 75 to 84	363
85 and over	99
Less than 65	52

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2018

Hypertension	75
High Cholesterol	50
Stroke	4
Ischemic Heart Disease	28
Depression	15
Chronic Kidney Disease	22
Asthma	13
Osteoperosis	7
Atrial Fibrilation	13
Heart Failure	15
Chronic Obstructive Pulmonary Disease	26
Diabetes	23
Dementia	6
Cancer	10

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2019 were pulmonary testing, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	1954
pulmonary testing	551
removal of lesion (e.g. growth)	18
skin procedures	18

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	454
Female	473

**Ethnicity**
Non-Hispanic White	859
Black	0
Hispanic	42
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	380
From 75 to 84	373
85 and over	124
Less than 65	50

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2019

Hypertension	72
High Cholesterol	46
Stroke	3
Ischemic Heart Disease	27
Depression	17
Chronic Kidney Disease	19
Asthma	12
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	15
Chronic Obstructive Pulmonary Disease	24
Diabetes	21
Dementia	5
Cancer	10

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2020 were pulmonary testing, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	1758
pulmonary testing	407
removal of lesion (e.g. growth)	21
skin procedures	21

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	462
Female	461

**Ethnicity**
Non-Hispanic White	869
Black	0
Hispanic	27
Asian	0
Other	14
Native American	0

**Age**
From 65 to 74	387
From 75 to 84	379
85 and over	120
Less than 65	37

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2020

Hypertension	74
High Cholesterol	45
Stroke	4
Ischemic Heart Disease	26
Depression	15
Chronic Kidney Disease	20
Asthma	11
Osteoperosis	5
Atrial Fibrilation	13
Heart Failure	14
Chronic Obstructive Pulmonary Disease	19
Diabetes	22
Dementia	5
Cancer	9

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2021 were pulmonary testing, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	1939
pulmonary testing	588
removal of lesion (e.g. growth)	25
skin procedures	25

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	512
Female	466

**Ethnicity**
Non-Hispanic White	919
Black	0
Hispanic	29
Asian	0
Other	15
Native American	0

**Age**
From 65 to 74	381
From 75 to 84	410
85 and over	136
Less than 65	51

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2021

Hypertension	75
High Cholesterol	46
Stroke	4
Ischemic Heart Disease	29
Depression	16
Chronic Kidney Disease	23
Asthma	12
Osteoperosis	6
Atrial Fibrilation	14
Heart Failure	17
Chronic Obstructive Pulmonary Disease	23
Diabetes	24
Dementia	6
Cancer	12

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA during 2022 were pulmonary testing, removal of lesion (e.g. growth) and skin procedures.

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

doctor visit	1781
pulmonary testing	706
removal of lesion (e.g. growth)	14
skin procedures	14

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	513
Female	475

**Ethnicity**
Non-Hispanic White	934
Black	0
Hispanic	25
Asian	0
Other	16
Native American	0

**Age**
From 65 to 74	404
From 75 to 84	388
85 and over	144
Less than 65	52

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2022

Hypertension	75
High Cholesterol	58
Stroke	7
Ischemic Heart Disease	21
Depression	18
Chronic Kidney Disease	16
Asthma	15
Osteoperosis	9
Atrial Fibrilation	16
Heart Failure	15
Chronic Obstructive Pulmonary Disease	27
Diabetes	25
Dementia	4
Cancer	15

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John Frederick Shield, MD for Medicare patients.

The highest averages for the top procedures that Dr. John Frederick Shield, MD treated as an internist in Sonora, CA were pulmonary testing, removal of lesion (e.g. growth), skin procedures and ear procedures.

doctor visit	1918
ear procedures	14
pulmonary testing	474
removal of lesion (e.g. growth)	25
skin procedures	25

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John Frederick Shield, MD.

**Gender**
Male	428
Female	420

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	799
Native American / Alaskan Native	0
Hispanic	29
Other	5

**Age**
75 to 84	327
85 and over	108
Less than 65	47
65 to 74	365

Average of Total of Conditions of Medicare patients treated by Dr. John Frederick Shield, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. John Frederick Shield, MD treated were hypertension, high cholesterol, ischemic heart disease and chronic obstructive pulmonary disease.

Hypertension	67
High Cholesterol	43
Stroke	3
Ischemic Heart Disease	24
Depression	14
Chronic Kidney Disease	17
Asthma	15
Osteoporosis	6
Heart Failure	15
Chronic Obstructive Pulmonary Disease	23
Diabetes	19
Atrial Fibrillation	11
Dementia	5
Cancer	10

Education & Training

He has a state license in California.

Licensed In: California

Ratings & Reviews

Dr. John Frederick Shield, MD has an average of 1.0 out of 5 stars based on 3 ratings. We collect ratings and reviews of Dr. John Frederick Shield, MD from all over the web to help you find the right in Sonora, CA.

Overall Rating

(3 Ratings)

Leave a Review

General Payments

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

**Payments by Company**
Boehringer Ingelheim Pharmaceuticals, Inc.	$97 STIOLTO $27	$70
GlaxoSmithKline, LLC.	$70 $70
AstraZeneca Pharmaceuticals LP	$26 BEVESPI AEROSPHERE $13	VIMOVO $13
Janssen Pharmaceuticals, Inc	$15 XARELTO $15

**Types of Payments**
Food and Beverage	$125
Consulting Fee	$70
Education	$14

Biography

Dr. John Shield studied medicine at Loma Linda University School of Medicine. He is rated 1.0 stars (out of 5) by his patients.

Select Year:

Dr. John Frederick Shield, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. John Frederick Shield, MD in 2023

By Volume:

By Affordability:

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. John Frederick Shield, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. John Frederick Shield, 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. John Frederick Shield, MD From 2012 - 2022

Education & Training

Ratings & Reviews

General Payments

Biography

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