Procedure Volume Patient Data Patient Conditions Reviews General Payments Back to Top

Home > CA Providers

Dr. Keith Barclay Mercer, MD

Accepting New Patients

(3 Ratings)

Specializes in: Ophthalmology (Eye Disease)

University of California, Irvine, School of Medicine

400 Sierra College Drive
Ste A Grass Valley, CA 95945

(530) 272-3411

Dr. Keith Barclay Mercer, MD is an ophthalmologist in Ste A Grass Valley, CA specializing in ophthalmology (eye disease). He graduated from University of California, Irvine, School of Medicine. Dr. Keith Barclay Mercer, MD is affiliated with Dignity Health and Hill Physicians.

Office Locations

400 Sierra College Drive
Ste A Grass Valley, CA 95945

(530) 272-3411

open_in_new

Dignity Health

400 Sierra College Drive Suite A
Grass Valley, CA 95945

(530) 272-3411

(530) 272-3474

open_in_new

Noteworthy Medicare Patient Procedures Performed by Dr. Keith Barclay Mercer, MD in 2024

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

Top 5%

By Affordability:

corneal pachymetry

eye tests

intermediate eye exam

ophthalmic imaging

ophthalmic ultrasound

scanning computerized ophthalmic diagnostic imaging

SCODI of the posterior segment

ultrasound corneal pachymetry

ultrasound

visual field test

In 2024, Dr. Keith Barclay Mercer, MD had a list price for corneal pachymetry (corneal thickness test), eye tests, intermediate eye exam, ophthalmic (eye and orbit) imaging, ophthalmic ultrasound, scanning computerized ophthalmic diagnostic imaging (SCODI), SCODI of the posterior segment (SCODI-P), ultrasound corneal pachymetry, ultrasound (sonogram), and visual field test that was lower than the list prices billed to Medicare by 95% 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.

Top 10%

By Affordability:

eye exam

In 2024, Dr. Keith Barclay Mercer, MD had a list price for eye exam 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.

Top 25%

By Affordability:

anterior segment surgery

comprehensive eye exam

eye surgery

In 2012, Dr. Keith Barclay Mercer, MD had a list price for anterior segment surgery, comprehensive eye exam, and eye surgery that was lower than the list prices billed to Medicare by 75% 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. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2012 were eye procedures, ultrasound (sonogram), capsulotomy and laser treatment.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	29
eye procedures	2994
laser treatment	29
ultrasound (sonogram)	369

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2013 were eye procedures, ultrasound (sonogram), laser treatment and capsulotomy.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	37
eye procedures	3019
laser treatment	56
ultrasound (sonogram)	462

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	570
Female	837

**Ethnicity**
Non-Hispanic White	1359
Black	0
Hispanic	24
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	500
From 75 to 84	538
85 and over	314
Less than 65	55

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2013

Hypertension	61
High Cholesterol	55
Stroke	4
Ischemic Heart Disease	26
Depression	12
Chronic Kidney Disease	15
Asthma	5
Osteoperosis	9
Atrial Fibrilation	13
Heart Failure	13
Chronic Obstructive Pulmonary Disease	9
Diabetes	19
Dementia	7
Cancer	10

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2014 were eye procedures, ultrasound (sonogram), laser treatment and capsulotomy.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	37
eye procedures	3087
laser treatment	52
ultrasound (sonogram)	450

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	561
Female	858

**Ethnicity**
Non-Hispanic White	1359
Black	0
Hispanic	31
Asian	0
Other	13
Native American	0

**Age**
From 65 to 74	548
From 75 to 84	509
85 and over	299
Less than 65	63

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2014

Hypertension	59
High Cholesterol	55
Stroke	5
Ischemic Heart Disease	26
Depression	15
Chronic Kidney Disease	15
Asthma	6
Osteoperosis	9
Atrial Fibrilation	11
Heart Failure	12
Chronic Obstructive Pulmonary Disease	8
Diabetes	17
Dementia	6
Cancer	10

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2015 were eye procedures, ultrasound (sonogram), capsulotomy and laser treatment.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	39
doctor visit	39
eye procedures	3347
laser treatment	39
ultrasound (sonogram)	439

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	1270
Female	1898

**Ethnicity**
Non-Hispanic White	3024
Black	0
Hispanic	62
Asian	0
Other	42
Native American	0

**Age**
From 65 to 74	1222
From 75 to 84	1166
85 and over	658
Less than 65	122

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2015

Hypertension	61
High Cholesterol	58
Stroke	5
Ischemic Heart Disease	26
Depression	15
Chronic Kidney Disease	17
Asthma	8
Osteoperosis	8
Atrial Fibrilation	12
Heart Failure	12
Chronic Obstructive Pulmonary Disease	10
Diabetes	18
Dementia	6
Cancer	9

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2016 were eye procedures, ultrasound (sonogram), capsulotomy and laser treatment.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	55
doctor visit	24
eye procedures	3469
lab tests	36
laser treatment	55
ultrasound (sonogram)	457

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	667
Female	986

**Ethnicity**
Non-Hispanic White	1565
Black	0
Hispanic	42
Asian	0
Other	25
Native American	0

**Age**
From 65 to 74	707
From 75 to 84	560
85 and over	314
Less than 65	72

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2016

Hypertension	59
High Cholesterol	57
Stroke	5
Ischemic Heart Disease	26
Depression	17
Chronic Kidney Disease	19
Asthma	13
Osteoperosis	9
Atrial Fibrilation	11
Heart Failure	10
Chronic Obstructive Pulmonary Disease	11
Diabetes	20
Dementia	6
Cancer	10

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2017 were eye procedures, ultrasound (sonogram), capsulotomy and laser treatment.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	36
eye procedures	2912
lab tests	31
laser treatment	36
ultrasound (sonogram)	231

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	654
Female	922

**Ethnicity**
Non-Hispanic White	1478
Black	0
Hispanic	43
Asian	0
Other	33
Native American	0

**Age**
From 65 to 74	697
From 75 to 84	556
85 and over	271
Less than 65	52

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2017

Hypertension	61
High Cholesterol	56
Stroke	6
Ischemic Heart Disease	27
Depression	17
Chronic Kidney Disease	19
Asthma	7
Osteoperosis	9
Atrial Fibrilation	12
Heart Failure	13
Chronic Obstructive Pulmonary Disease	10
Diabetes	19
Dementia	7
Cancer	11

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2018 were eye procedures, ultrasound (sonogram), capsulotomy and laser treatment.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	38
eye procedures	3242
laser treatment	38
ultrasound (sonogram)	319

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	668
Female	931

**Ethnicity**
Non-Hispanic White	1503
Black	0
Hispanic	33
Asian	17
Other	35
Native American	0

**Age**
From 65 to 74	705
From 75 to 84	598
85 and over	246
Less than 65	50

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2018

Hypertension	62
High Cholesterol	64
Stroke	6
Ischemic Heart Disease	28
Depression	20
Chronic Kidney Disease	20
Asthma	7
Osteoperosis	11
Atrial Fibrilation	12
Heart Failure	12
Chronic Obstructive Pulmonary Disease	11
Diabetes	17
Dementia	8
Cancer	11

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2019 were eye procedures, ultrasound (sonogram), capsulotomy and laser treatment.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	52
eye procedures	3087
laser treatment	52
ultrasound (sonogram)	254

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	629
Female	901

**Ethnicity**
Non-Hispanic White	1454
Black	0
Hispanic	28
Asian	0
Other	33
Native American	0

**Age**
From 65 to 74	678
From 75 to 84	598
85 and over	216
Less than 65	38

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2019

Hypertension	62
High Cholesterol	65
Stroke	6
Ischemic Heart Disease	26
Depression	19
Chronic Kidney Disease	20
Asthma	7
Osteoperosis	12
Atrial Fibrilation	11
Heart Failure	11
Chronic Obstructive Pulmonary Disease	8
Diabetes	18
Dementia	7
Cancer	9

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2020 were eye procedures, ultrasound (sonogram), capsulotomy and laser treatment.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	41
eye procedures	2705
laser treatment	41
ultrasound (sonogram)	181

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	581
Female	840

**Ethnicity**
Non-Hispanic White	1333
Black	0
Hispanic	36
Asian	0
Other	32
Native American	0

**Age**
From 65 to 74	610
From 75 to 84	549
85 and over	217
Less than 65	45

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2020

Hypertension	58
High Cholesterol	63
Stroke	6
Ischemic Heart Disease	26
Depression	20
Chronic Kidney Disease	19
Asthma	8
Osteoperosis	11
Atrial Fibrilation	11
Heart Failure	12
Chronic Obstructive Pulmonary Disease	8
Diabetes	17
Dementia	6
Cancer	10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2021 were eye procedures, ultrasound (sonogram), capsulotomy and laser treatment.

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	55
eye procedures	2923
laser treatment	55
ultrasound (sonogram)	171

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	619
Female	926

**Ethnicity**
Non-Hispanic White	1447
Black	0
Hispanic	41
Asian	0
Other	40
Native American	0

**Age**
From 65 to 74	647
From 75 to 84	611
85 and over	235
Less than 65	52

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2021

Hypertension	56
High Cholesterol	62
Stroke	5
Ischemic Heart Disease	26
Depression	20
Chronic Kidney Disease	20
Asthma	6
Osteoperosis	11
Atrial Fibrilation	11
Heart Failure	13
Chronic Obstructive Pulmonary Disease	8
Diabetes	17
Dementia	8
Cancer	10

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2022 were eye procedures, capsulotomy, laser treatment and ultrasound (sonogram).

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	63
eye procedures	2857
laser treatment	63
ultrasound (sonogram)	16

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	671
Female	968

**Ethnicity**
Non-Hispanic White	1537
Black	0
Hispanic	45
Asian	0
Other	40
Native American	0

**Age**
From 65 to 74	707
From 75 to 84	636
85 and over	229
Less than 65	67

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2022

Hypertension	64
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	21
Depression	19
Chronic Kidney Disease	16
Asthma	10
Osteoperosis	16
Atrial Fibrilation	16
Heart Failure	10
Chronic Obstructive Pulmonary Disease	11
Diabetes	19
Dementia	5
Cancer	12

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2023 were eye procedures, capsulotomy, laser treatment and ultrasound (sonogram).

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	49
doctor visit	13
eye procedures	3014
laser treatment	49
ultrasound (sonogram)	29

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	706
Female	1046

**Ethnicity**
Non-Hispanic White	1638
Black	0
Hispanic	39
Asian	0
Other	55
Native American	0

**Age**
From 65 to 74	744
From 75 to 84	686
85 and over	246
Less than 65	76

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2023

Hypertension	63
High Cholesterol	75
Stroke	7
Ischemic Heart Disease	21
Depression	20
Chronic Kidney Disease	17
Asthma	9
Osteoperosis	16
Atrial Fibrilation	16
Heart Failure	11
Chronic Obstructive Pulmonary Disease	11
Diabetes	18
Dementia	6
Cancer	12

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA during 2024 were eye procedures, capsulotomy, laser treatment and ultrasound (sonogram).

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

capsulotomy	38
eye procedures	2642
laser treatment	38
ultrasound (sonogram)	15

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Male	594
Female	871

**Ethnicity**
Non-Hispanic White	1383
Black	0
Hispanic	31
Asian	0
Other	39
Native American	0

**Age**
From 65 to 74	596
From 75 to 84	618
85 and over	209
Less than 65	42

Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD in 2024

Hypertension	65
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	23
Depression	21
Chronic Kidney Disease	17
Asthma	10
Osteoperosis	17
Atrial Fibrilation	16
Heart Failure	11
Chronic Obstructive Pulmonary Disease	11
Diabetes	18
Dementia	6
Cancer	12

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Keith Barclay Mercer, MD for Medicare patients.

The highest averages for the top procedures that Dr. Keith Barclay Mercer, MD treated as an ophthalmologist in Ste A Grass Valley, CA were eye procedures, ultrasound (sonogram), laser treatment and capsulotomy.

capsulotomy	43
doctor visit	25
eye procedures	3022
lab tests	33
laser treatment	46
ultrasound (sonogram)	261

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Keith Barclay Mercer, MD.

**Gender**
Female	921
Male	630

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	1
Non-Hispanic White	1467
Native American / Alaskan Native	0
Hispanic	35
Other	30

**Age**
85 and over	265
75 to 84	586
Less than 65	56
65 to 74	643

Average of Total of Conditions of Medicare patients treated by Dr. Keith Barclay Mercer, MD From 2012 - 2024

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

Hypertension	56
High Cholesterol	58
Stroke	5
Ischemic Heart Disease	23
Depression	16
Chronic Kidney Disease	16
Asthma	7
Osteoporosis	10
Heart Failure	10
Chronic Obstructive Pulmonary Disease	8
Diabetes	16
Atrial Fibrillation	11
Dementia	6
Cancer	9

Education & Training

Dr. Keith Barclay Mercer, MD graduated from University of California, Irvine, School of Medicine. He completed residency at University of California, Irvine Affiliated Hospitals. He is certified by the Board Certification: Ophthalmology and has a state license in California.

Medical School: University of California, Irvine, School of Medicine

Residency: University of California, Irvine Affiliated Hospitals

Board Certification: Board Certification: Ophthalmology

Licensed In: California

Affiliations & Hospitals

Dr. Keith Barclay Mercer, MD is associated with these hospitals and organizations:

Dignity Health

Hill Physicians

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. Keith Barclay Mercer, MD appears to accept the following insurance providers: Health Net, Cigna, Aetna, UnitedHealthcare, Anthem, Blue Shield of California and Hill Physicians Care Solutions.

Insurance Accepted by Provider includes:

According to our sources, Dr. Keith Barclay Mercer, MD accepts the following insurance providers:

Health Net

Cigna

Aetna

UnitedHealthcare

Anthem

Blue Shield of California

Hill Physicians Care Solutions

Ratings & Reviews

Dr. Keith Barclay Mercer, MD has a high overall rating with an average of 3.67 out of 5 stars based on 3 ratings. We collect ratings and reviews of Dr. Keith Barclay Mercer, MD from all over the web to help you find the right in Ste A Grass Valley, CA.

3.67

Overall Rating

(3 Ratings)

Leave a Review

General Payments

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

**Payments by Company**
Alcon Laboratories Inc	$647 Refractive Equipment $62	Cataract Equipment $42	ORA $28	Pazeo $24	Centurion $15	Other $477
Allergan Inc.	$338 RESTASIS $122	COMBIGAN $69	LUMIGAN $62	$85
Aerie Pharmaceuticals, Inc.	$236 Rhopressa $119	Rocklatan $117
Sun Pharmaceutical Industries Inc.	$158 CEQUA $47	BromSite (bromfenac ophthalmic solution) 0.075% $45	Bromsite $34	XELPROS $33
GLAUKOS CORPORATION	$106 iSTENT iNJECT TRABECULAR MICRO-BYPASS STENT SYSTEM $64	ISTENT TRABECULAR MICRO-BYPASS STENT SYSTEM $42
Other	$734 TEPEZZA $67	DURYSTA $66	Optics $50	Healon Viscoelastics $49	XIIDRA $49	Other $452

**Types of Payments**
Food and Beverage	$1,763
Travel and Lodging	$456

Biography

Dr. Keith Mercer sees patients in Grass Valley, CA and Ste A Grass Valley, CA. His medical specialty is ophthalmology (eye disease). On average, patients gave him a rating of 3.5 stars (out of 5). Dr. Mercer most likely takes Blue Shield, Health Net, and Anthem, as well as other insurance carriers. He attended medical school at the University of California, Irvine, School of Medicine. Dr. Mercer's medical residency was performed at a hospital affiliated with the University of California, Irvine. He is affiliated with Hill Physicians and Sierra Nevada Memorial Hospital. According to Hill Physicians, new patients are welcome to contact his office in Ste A Grass Valley, CA.