Physician Profile
Errol B. Williams, M.D.
Unclaimed ProfileAbout Dr. Williams
Errol B. Williams, M.D. is a healthcare provider in Ontario, OH specializing in cardiovascular disease. Errol trained at Boston University School of Medicine, graduating in 1990. Medicare claims data shows Errol provided 1,620 services to 1,133 patients. The services billed most often include routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and ultrasound of heart with color-depicted blood flow, rate, direction and valve function.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (419) 462-4600
- Email not available
Practice Locations
715 RICHLAND MALL
Ontario, OH 44906
629 N Sandusky Ave
Bucyrus, OH 44820
Conditions Commonly Evaluated or Treated
Within Cardiovascular Disease generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- AFib
- Congestive heart failure
- Heart attack
- Heart disease
- High blood pressure
- High cholesterol
Coronary and ischemic heart disease
- Coronary artery disease
- Stable angina
Heart failure and cardiomyopathy
- Hypertrophic cardiomyopathy
- Myocarditis
- Pericardial effusion
Heart rhythm
- Slow heart rate (bradycardia)
- Supraventricular tachycardia
Symptoms and functional disorders
- Fainting and syncope
- Heart palpitations
- Postural orthostatic tachycardia syndrome
Valve and structural heart
- Aortic stenosis
- Mitral regurgitation
- Mitral valve prolapse
- Patent foramen ovale
Vascular and risk factors
- Aortic aneurysm
- Carotid artery disease
- Familial hypercholesterolemia
- Resistant hypertension
Artery & vascular
- Peripheral Artery Disease (PAD)
Heart inflammation
- Pericarditis (Heart Sac Inflammation)
Heart muscle
- Poor Circulation and Swollen Legs
Heart valves
- Heart Murmur
Vascular disease
- High Blood Pressure in the Lungs (Pulmonary Hypertension)
Procedures & services
Most searched procedures
- Echocardiogram
- EKG
- Heart monitor
- Heart stent
- Pacemaker surgery
- Stress test
Office and noninvasive testing
- Ambulatory blood-pressure monitoring
Advanced imaging
- Cardiac magnetic resonance imaging
- Nuclear cardiac stress imaging
Consultations
- Preventive Cardiology Consultation
Diagnostic testing
- Cardiopulmonary Exercise Testing (CPET)
- Tilt Table Test
Diagnostics
- Electrophysiology Study (EP Study)
Heart devices
- Biventricular Pacemaker (Cardiac Resynchronization Therapy)
- Implantable Loop Recorder (Cardiac Monitor Implant)
Heart imaging
- Heart CT Scan (Cardiac CT)
Heart procedures
- Heart Fluid Drainage (Pericardiocentesis)
Heart rhythm procedures
- Radiofrequency ablation
Imaging
- Heart Calcium Scan
- Transesophageal Echocardiogram for Kids
Implants
- Defibrillator Implant (ICD)
Recovery & rehabilitation
- Cardiac Rehabilitation Program
Vascular imaging
- Carotid Ultrasound
- Leg Circulation Test (ABI and Arterial Doppler)
Procedures Most Often Billed to Medicare
1,620 services · 1,133 patients · 12 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
631 | More often than most peers in Cardiovascular Disease |
| Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | Treatment | 93306 |
227 | As often as other peers in Cardiovascular Disease |
| Ultrasound of heart with continuous electrocardiogram (ecg) during rest, exercise and/or drug induced stress with review and report | Treatment | 93351 |
58 | More often than most peers in Cardiovascular Disease |
| Injection of x-ray contrast during ultrasound of heart | Treatment | 93352 |
28 | More often than most peers in Cardiovascular Disease |
| Heart rhythm review, and interpretation of continous external ekg over more than 48 hours up to 7 days | Treatment | 93244 |
23 | As often as other peers in Cardiovascular Disease |
| Ultrasound of heart, follow-up | Treatment | 93308 |
22 | |
| Heart rhythm review and interpretation of continous external ekg over 8-15 days | Treatment | 93248 |
11 | |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
512 | More often than most peers in Cardiovascular Disease |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
38 | As often as other peers in Cardiovascular Disease |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
35 | As often as other peers in Cardiovascular Disease |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 2
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Boston University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1990 at Boston University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 8
Providers in OH who bill this service to Medicare most often.
Common questions
What does Errol B. Williams specialize in?
Errol B. Williams is a cardiologist in Ontario, OH. That is the designation recorded for this NPI in the federal registry, where it is listed as “Cardiovascular Disease”.
NPI registry
Where is Errol B. Williams located?
Errol B. Williams is listed at 715 Richland Mall, Ontario, OH 44906. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Errol B. Williams's phone number?
The number on file is (419) 462-4600. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Errol B. Williams?
Errol B. Williams's National Provider Identifier is 1366456519. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Errol B. Williams train?
Errol B. Williams attended Boston University School of Medicine, graduating in 1990. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Errol B. Williams have?
Errol B. Williams has 36 years experience. Calculated from a graduation year of 1990, reported in the CMS National Downloadable File.
CMS public data
What does Errol B. Williams do most often?
According to Medicare billing data, Errol B. Williams provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report only and ultrasound of heart with color-depicted blood flow, rate, direction and valve function, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Errol B. Williams's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Errol B. Williams. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.