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Dr. Merlyn Ancilla Johnson, MD

Accepting New Patients

(52 Ratings)

Specializes in: Family Medicine

305 Second Avenue
Collegeville, PA 19426

(484) 961-8220

Dr. Merlyn Ancilla Johnson, MD is a family medicine practitioner in Collegeville, PA specializing in family medicine. Dr. Merlyn Ancilla Johnson, MD is affiliated with Tower Health.

Office Locations

305 Second Avenue
Collegeville, PA 19426

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Noteworthy Medicare Patient Procedures Performed by Dr. Merlyn Ancilla Johnson, MD in 2023

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

Top 5%

By Affordability:

In 2023, Dr. Merlyn Ancilla Johnson, MD had a list price for flu shot, flu vaccine, immunization (preventive vaccines), and vaccines that was lower than the list prices billed to Medicare by 95% of providers in related specialties within Pennsylvania. 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. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2012 were blood draw, preventive care and vaccines.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

blood draw	26
doctor visit	90
preventive care	17
vaccines	17

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2013 were blood draw, preventive care and vaccines.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

blood draw	79
doctor visit	233
preventive care	11
vaccines	11

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	62
Female	81

**Ethnicity**
Non-Hispanic White	118
Black	0
Hispanic	0
Asian	12
Other	0
Native American	0

**Age**
From 65 to 74	62
From 75 to 84	28
85 and over	16
Less than 65	37

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2013

Hypertension	57
High Cholesterol	49
Stroke	0
Ischemic Heart Disease	34
Depression	25
Chronic Kidney Disease	13
Asthma	0
Osteoperosis	0
Atrial Fibrilation	11
Heart Failure	11
Chronic Obstructive Pulmonary Disease	20
Diabetes	24
Dementia	0
Cancer	8

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2014 were blood draw, preventive care and vaccines.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

blood draw	74
doctor visit	199
preventive care	15
vaccines	15

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	42
Female	76

**Ethnicity**
Non-Hispanic White	94
Black	0
Hispanic	0
Asian	13
Other	0
Native American	0

**Age**
From 65 to 74	54
From 75 to 84	28
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2014

Hypertension	64
High Cholesterol	46
Stroke	0
Ischemic Heart Disease	33
Depression	26
Chronic Kidney Disease	14
Asthma	0
Osteoperosis	0
Atrial Fibrilation	11
Heart Failure	11
Chronic Obstructive Pulmonary Disease	16
Diabetes	34
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2015 were blood draw, preventive care and vaccines.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

blood draw	108
doctor visit	337
preventive care	39
vaccines	39

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	114
Female	166

**Ethnicity**
Non-Hispanic White	224
Black	0
Hispanic	0
Asian	28
Other	0
Native American	0

**Age**
From 65 to 74	118
From 75 to 84	76
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2015

Hypertension	61
High Cholesterol	43
Stroke	0
Ischemic Heart Disease	37
Depression	24
Chronic Kidney Disease	17
Asthma	14
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	10
Chronic Obstructive Pulmonary Disease	19
Diabetes	28
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2016 were blood draw, preventive care and vaccines.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

blood draw	139
doctor visit	337
preventive care	68
vaccines	68

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	65
Female	100

**Ethnicity**
Non-Hispanic White	128
Black	0
Hispanic	0
Asian	24
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	46
85 and over	11
Less than 65	32

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2016

Hypertension	56
High Cholesterol	47
Stroke	0
Ischemic Heart Disease	32
Depression	20
Chronic Kidney Disease	21
Asthma	24
Osteoperosis	0
Atrial Fibrilation	8
Heart Failure	12
Chronic Obstructive Pulmonary Disease	16
Diabetes	28
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2017 were blood draw, preventive care and vaccines.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

blood draw	148
doctor visit	349
preventive care	42
vaccines	42

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	69
Female	99

**Ethnicity**
Non-Hispanic White	125
Black	0
Hispanic	0
Asian	25
Other	0
Native American	0

**Age**
From 65 to 74	72
From 75 to 84	57
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2017

Hypertension	50
High Cholesterol	39
Stroke	0
Ischemic Heart Disease	24
Depression	22
Chronic Kidney Disease	21
Asthma	8
Osteoperosis	9
Atrial Fibrilation	9
Heart Failure	11
Chronic Obstructive Pulmonary Disease	17
Diabetes	29
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2018 were blood draw, preventive care, vaccines and lab tests.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

blood draw	176
doctor visit	404
lab tests	16
preventive care	39
vaccines	39

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	77
Female	110

**Ethnicity**
Non-Hispanic White	137
Black	0
Hispanic	0
Asian	31
Other	0
Native American	0

**Age**
From 65 to 74	81
From 75 to 84	56
85 and over	12
Less than 65	38

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2018

Hypertension	59
High Cholesterol	42
Stroke	0
Ischemic Heart Disease	27
Depression	21
Chronic Kidney Disease	16
Asthma	0
Osteoperosis	0
Atrial Fibrilation	9
Heart Failure	13
Chronic Obstructive Pulmonary Disease	15
Diabetes	29
Dementia	0
Cancer	7

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2019 were blood draw.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

blood draw	127
doctor visit	342

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	59
Female	99

**Ethnicity**
Non-Hispanic White	114
Black	0
Hispanic	0
Asian	22
Other	0
Native American	0

**Age**
From 65 to 74	67
From 75 to 84	45
85 and over	13
Less than 65	33

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2019

Hypertension	58
High Cholesterol	47
Stroke	0
Ischemic Heart Disease	30
Depression	24
Chronic Kidney Disease	25
Asthma	7
Osteoperosis	8
Atrial Fibrilation	0
Heart Failure	16
Chronic Obstructive Pulmonary Disease	11
Diabetes	30
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2020 were preventive care, vaccines and cardiac procedures.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

cardiac procedures	12
doctor visit	331
preventive care	83
vaccines	58

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	89
Female	127

**Ethnicity**
Non-Hispanic White	160
Black	0
Hispanic	0
Asian	34
Other	0
Native American	0

**Age**
From 65 to 74	102
From 75 to 84	68
85 and over	12
Less than 65	34

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2020

Hypertension	66
High Cholesterol	56
Stroke	0
Ischemic Heart Disease	25
Depression	14
Chronic Kidney Disease	25
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	11
Chronic Obstructive Pulmonary Disease	8
Diabetes	30
Dementia	0
Cancer	6

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA during 2021 were preventive care, vaccines and lab tests.

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

doctor visit	402
lab tests	14
preventive care	20
vaccines	20

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	82
Female	113

**Ethnicity**
Non-Hispanic White	143
Black	13
Hispanic	0
Asian	25
Other	0
Native American	0

**Age**
From 65 to 74	93
From 75 to 84	64
85 and over	12
Less than 65	26

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2021

Hypertension	67
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	22
Depression	15
Chronic Kidney Disease	26
Asthma	0
Osteoperosis	7
Atrial Fibrilation	6
Heart Failure	9
Chronic Obstructive Pulmonary Disease	9
Diabetes	29
Dementia	7
Cancer	7

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

doctor visit	357

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	73
Female	103

**Ethnicity**
Non-Hispanic White	134
Black	0
Hispanic	0
Asian	22
Other	0
Native American	0

**Age**
From 65 to 74	86
From 75 to 84	62
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2022

Hypertension	73
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	20
Depression	19
Chronic Kidney Disease	23
Asthma	7
Osteoperosis	14
Atrial Fibrilation	8
Heart Failure	10
Chronic Obstructive Pulmonary Disease	15
Diabetes	30
Dementia	7
Cancer	14

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Merlyn Ancilla Johnson, MD for Medicare patients.

The highest averages for the top procedures that Dr. Merlyn Ancilla Johnson, MD treated as a family medicine practitioner in Collegeville, PA were blood draw, preventive care, vaccines and lab tests.

blood draw	109
cardiac procedures	12
doctor visit	307
lab tests	15
preventive care	37
vaccines	34

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD.

**Gender**
Male	66
Female	97

**Ethnicity**
Black / African American	1
Asian / Pacific Islander	21
Non-Hispanic White	125
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
75 to 84	48
85 and over	6
Less than 65	18
65 to 74	73

Average of Total of Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Merlyn Ancilla Johnson, MD treated were hypertension, high cholesterol, diabetes and ischemic heart disease.

Hypertension	55
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	25
Depression	19
Chronic Kidney Disease	18
Asthma	5
Osteoporosis	3
Heart Failure	10
Chronic Obstructive Pulmonary Disease	13
Diabetes	26
Atrial Fibrillation	6
Dementia	1
Cancer	3

Education & Training

She is certified by the American Board of Family Medicine and has a state license in Pennsylvania.

Board Certification: American Board of Family Medicine

Licensed In: Pennsylvania

Affiliations & Hospitals

Dr. Merlyn Ancilla Johnson, MD is associated with these hospitals and organizations:

Tower Health

Ratings & Reviews

Dr. Merlyn Ancilla Johnson, MD has an exceptional overall rating with an average of 4.98 out of 5 stars based on 52 ratings. We collect ratings and reviews of Dr. Merlyn Ancilla Johnson, MD from all over the web to help you find the right in Collegeville, PA.

4.98

Overall Rating

(52 Ratings)

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Reviews From Around The Web

Overall Rating: 5.0 2025-10-06

Patient verified via Press Ganey

Dr. Merlyn Johnson is an amazing doctor. She's thorough, caring, and always goes above and beyond for her patients. I always feel supported and know she's there for me during critical health issues. She takes time to listen, explains things clearly, and makes sure I understand every step of my care.She guided me through an unexpected major surgery, both before and after the operation, with genuine compassion and attention to detail. Her professionalism, warmth, and dedication make a real difference. I'm truly grateful to have her as my doctor-she's exceptional in every way.

Overall Rating: 5.0 2025-10-19

Patient verified via Press Ganey

I would recommend Dr. Johnson and the crew in Collegeville 100%! They take wonderful care of all their patients! They are also very friendly and welcoming when we come for our appointments! So glad that I can be there and get such great care! We love coming to see Dr. Johnson! She is super-and is very smart, too! Many thanks to all!

Overall Rating: 5.0 2025-08-25

Patient verified via Press Ganey

Dr. Johnson and everyone there makes sure you are comfortable with and understand what you are being told before you leave and always note that if there are any questions at all, to feel comfortable about asking them.

Overall Rating: 5.0 2025-10-01

Patient verified via Press Ganey

Dr. Johnson always shows me the utmost respect. She said she would pray for my partner who has a tumor not yet biopsied. She also recommended that I get labs done to see if my thyroid plays a role in the depression.

Overall Rating: 5.0 2025-11-24

Patient verified via Press Ganey

Dr. Johnston is really great. She takes the time to listen to my concerns and talk through care options. Her attention to detail and approachable attitude make me feel comfortable during the appointment.

Overall Rating: 5.0 2025-12-09

Patient verified via Press Ganey

I love this office. Dr Johnson is very patient and thorough in her exams. She takes the time to explain abd make recommendations. She is also very knowledgeable and friendly.

Overall Rating: 5.0 2025-07-05

Patient verified via Press Ganey

Dr. Johnson attentively listened to my health concerns. She proactively recommended follow-up tests and an appointment with a specialist, i.e., endocrinologist

Overall Rating: 5.0 2025-12-12

Patient verified via Press Ganey

Dr. Johnson is amazing! Kind and caring but direct as needed. Always sound advice and suggestions. There is no doubt that she has improved my overall health.

Overall Rating: 5.0 2025-10-23

Patient verified via Press Ganey

Dr Johnson is wonderful!! She is so thorough and really takes the time to explain your health care. Would highly recommend Dr Johnson.

Overall Rating: 5.0 2025-11-20

Patient verified via Press Ganey

Dr Johnson is the most caring and compassionate individual, always willing to take the time to discuss issues and well being.

To see all 52 reviews for Dr. Merlyn Ancilla Johnson, MD, view their full profile.

General Payments

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

**Payments by Company**
GlaxoSmithKline, LLC.	$998 BREO $563	ANORO $162	TRELEGY ELLIPTA $112	BOOSTRIX $75	SHINGRIX $40	Other $46
AstraZeneca Pharmaceuticals LP	$913 FARXIGA $531	SYMBICORT $251	BEVESPI AEROSPHERE $74	BREZTRI $40	BYDUREON WEEKLY $17
Pfizer Inc.	$644 COLOGUARD $222	ELIQUIS $165	LYRICA $111	EUCRISA $34	COLOGUARD DNA CAPTURE REAGENTS $34	Other $77
Novo Nordisk Inc	$604 Ozempic $260	RYBELSUS $114	Tresiba $85	Xultophy 100/3.6 $75	Saxenda $17	Other $53
Boehringer Ingelheim Pharmaceuticals, Inc.	$451 SYNJARDY XR $95	JARDIANCE $76	GLYXAMBI $75	SYNJARDY $46	TRADJENTA $34	Other $125
Other	$2,500 XARELTO $258	VRAYLAR $192	STEGLATRO $180	INVOKANA $141	SOLIQUA 100/33 $104	Other $1,624

**Types of Payments**
Food and Beverage	$5,900
Education	$194
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$15

Biography

Dr. Merlyn Johnson's specialty is family medicine. Patients rated her highly, giving her an average of 5.0 stars (out of 5). Dr. Johnson is conversant in Tamil. She is affiliated with Phoenixville Hospital. According to Doctor.com, new patients are welcome to contact her office in Collegeville, PA.

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Dr. Merlyn Ancilla Johnson, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Merlyn Ancilla Johnson, MD in 2023

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. Merlyn Ancilla Johnson, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Merlyn Ancilla Johnson, 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. Merlyn Ancilla Johnson, MD From 2012 - 2022

Education & Training

Affiliations & Hospitals

Ratings & Reviews

General Payments

Biography

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