Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Farrell, Cardiologist in Wallingford, CT?
Dr. William Farrell, MD is a Cardiologist, who primarily practices in Wallingford, CT with 2 additional practice locations. He is board certified by the American Board of Internal Medicine. Dr. Farrell graduated from Baylor College of Medicine in Houston, Texas and completed his residency at Yale New Haven Hosp, Cardiovascular Diseases; Yale New Haven Hosp, Internal Medicine. Dr. Farrell is fluent in English, and is currently seeing new patients. Dr. Farrell’s practice accepts Medicare, UnitedHealthcare, Aetna, Cigna and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Farrell’s office at (203) 265-9831.
Where did Dr. Farrell go to medical school and complete their residency?
Fellowship: Yale School of Medicine Cardiology | Yale New Haven Hospital Interventional Fellowship Cardiology | Yale - New Haven Hospital
Residency: Yale New Haven Hosp, Cardiovascular Diseases; Yale New Haven Hosp, Internal Medicine | Yale-New Haven Hospital | Bridgeport Hospital/Yale University Program
Medical School: University Of Ia Coll Of Med- Iowa City Ia | Baylor College of Medicine in Houston, Texas
Is Dr. Farrell board certified in Cardiologist?
Yes, Dr. William Farrell, MD is board certified by the American Board of Internal Medicine
What languages does Dr. Farrell speak?
Dr. Farrell and their clinical team can communicate with patients in the following languages:
English
What conditions does Dr. Farrell treat?
As a Cardiologist, Dr. Farrell diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Farrell. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly.
Also known as:
- Hardening of the Arteries in the Heart without Chest Pain
- Coronary Artery Disease with Angina
- Atherosclerosis
- Coronary Artery Disease
- Silent Coronary Artery Disease
- Asymptomatic Atherosclerosis
- Atherosclerotic Heart Disease with Angina
- Chest Pain from Heart Disease
- Angina Pectoris
ICD-10 Codes:
- I2510: Atherosclerotic heart disease of native coronary artery without angina pectoris
- I25119: Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris
- I25118: Atherosclerotic heart disease of native coronary artery with other forms of angina pectoris
Also known as:
- Arrhythmia
- Atrial Fibrillation
- Fast Heartbeat
- Irregular heartbeat
- Heart rhythm disorder
- Cardiac dysrhythmia
- Afib
- A-fib
- Irregular heart rhythm
- Tachycardia
- Rapid heart rate
- Racing heart
ICD-10 Codes:
- I499: Cardiac arrhythmia, unspecified
- I4891: Unspecified atrial fibrillation
- R000: Tachycardia, unspecified
Also known as:
- Abnormal EKG
- Heart Health Tests
- Irregular Electrocardiogram
- Unusual Heart Rhythm Test
- ECG Abnormalities
ICD-10 Codes:
- R9431: Abnormal electrocardiogram [ECG] [EKG]
Also known as:
- Other Pre-Procedure Examination
- Various pre-op checks
- Miscellaneous pre-surgery exams
- Other pre-treatment assessments
ICD-10 Codes:
- Z01818: Encounter for other preprocedural examination
Also known as:
- Chest Pain
- Chest discomfort
- Thoracic pain
- Upper body pain
ICD-10 Codes:
- R079: Chest pain, unspecified
Also known as:
- Muscle Weakness
- Muscle Disorder
- Loss of strength
- Fatigue
- Muscle fatigue
ICD-10 Codes:
- R531: Weakness
Also known as:
- Cardiovascular Disorder Screening
- Health Screening
- Heart Disease Screening
- Vascular Disease Check
- Cardiac Screening
ICD-10 Codes:
- Z136: Encounter for screening for cardiovascular disorders
Also known as:
- Shortness of Breath
- Breathing Problems
- Difficulty breathing
- Breathlessness
- Dyspnea
ICD-10 Codes:
- R0602: Shortness of breath
Also known as:
- High Blood Pressure
- Hypertension
- Primary Hypertension
- Essential Hypertension
ICD-10 Codes:
- I10: Essential (primary) hypertension
Also known as:
- High Cholesterol
- Cholesterol
- Triglycerides
- Hyperlipidemia
- High lipids
- Dyslipidemia
ICD-10 Codes:
- E785: Hyperlipidemia, unspecified
Also known as:
- Narrowed Aortic Valve
- Heart Valve Disease
- Aortic Valve Stenosis
- Tight Aortic Valve
ICD-10 Codes:
- I350: Nonrheumatic aortic (valve) stenosis
Also known as:
- Chest Pain
- Chest discomfort
- Thoracic pain
- Pectoral pain
ICD-10 Codes:
- R0789: Other chest pain
Also known as:
- Fainting
- Syncope
- Passing out
- Collapse
ICD-10 Codes:
- R55: Syncope and collapse
Also known as:
- High Blood Pressure Heart Disease with Heart Failure
- Heart Failure
- High Blood Pressure
- Hypertensive Heart Failure
- High Blood Pressure Causing Heart Failure
ICD-10 Codes:
- I110: Hypertensive heart disease with heart failure
Also known as:
- Heart Attack (NSTEMI)
- Heart Attack
- Myocardial Infarction
- Non-STEMI
- Less Severe Heart Attack
ICD-10 Codes:
- I214: Non-ST elevation (NSTEMI) myocardial infarction
Also known as:
- Coronary Artery Bypass Graft
- Coronary Artery Bypass Surgery
- CABG
- Heart Bypass Graft
- Bypass Surgery Graft
ICD-10 Codes:
- Z951: Presence of aortocoronary bypass graft
Which procedures does Dr. Farrell perform as a Cardiologist?
As a Cardiologist, procedures performed by a Dr. William Farrell may include:
- Absent Pulmonary Valve Repair
- Anomalous Coronary Artery Angiography
- Anticoagulation Management
- Aortic Stenosis Repair
- Aortic Valve Repair / Replacement
- Aortopulmonary Window Repair
- Arterial Doppler
- Balloon Septostomy
For detailed information, please contact Dr. Farrell's office.
Does Dr. Farrell accept my insurance?
Dr. Farrell accepts most major insurance plans. Important: Please call our office at (203) 265-9831 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Farrell accept in Wallingford, CT?
Dr. Farrell in Wallingford, CT accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
CarePartners of Connecticut
CVS Health (formerly Aetna)
Department of Veterans Affairs
Elevance Health Inc. (formerly Anthem)
EmblemHealth
Express Scripts
Medicare
OptumRx
State of Connecticut
UnitedHealthcare
View All Insurances
Where is Dr. Farrell's office located?
Dr. William Farrell's Primary Practice
1062 Barnes Rd Ste 300
Wallingford, CT 06492
(203) 265-9831
Recognitions
Castle Connolly Doctor’s Choice Awards
Doctor’s Choice - 2025
Among the most nominated for the Castle Connolly Top Doctor recognition in 2025
What is Dr. Farrell's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Farrell's National Provider Identifier (NPI) number is 1417951203.
What common questions do patients ask about Dr. Farrell?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Farrell
What is Dr. William Farrell's specialty?
Dr. Farrell is a Cardiologist near Wallingford, CT. An internist specializing in cardiovascular diseases focuses on the diagnosis and management of complex heart and blood vessel conditions, including heart attacks and life-threatening arrhythmias. Contact Dr. Farrell to book an appointment today.
Is this Dr. William Farrell affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Farrell is affiliated with MidState Medical Center, Hartford Hospital which are a Castle Connolly Top Hospitals. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
Where can I learn more about Cardiologist?
Explore Cardiologist with insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is William Farrell accepting new patients in Wallingford, CT?
Yes, Dr. William Farrell is accepting new patients at this time.
Does Dr. William Farrell offer online booking?
Please contact Dr. Farrell's office at (203) 265-9831 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with William Farrell?
Please contact Dr. Farrell's office at (203) 265-9831 for information regarding telehealth appointment availability or for scheduling assistance.
Which board certifications does Dr. William Farrell have?
Dr. William Farrell is certified by the American Board of Internal Medicine.
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