Physician Profile
William Gionfriddo, M.D.
Unclaimed ProfileAbout Dr. Gionfriddo
William Gionfriddo, M.D. practices internal medicine in Boston, MA. William is a 2014 graduate of University of Connecticut School of Medicine. According to Medicare claims data, William cared for 345 Medicare patients across 386 services. The services billed most often include routine electrocardiogram (ecg) using at least 12 leads with interpretation and report, electrocardiogram (ecg) up to 30 days continuous with review and report by health care professional, and established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
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
- (617) 636-5000
- Email not available
Practice Locations
800 WASHINGTON ST
Boston, MA 02111
Conditions Commonly Evaluated or Treated
Within Internal Medicine 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
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Infectious disease
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Most searched procedures
Preventive and evaluation
Screening and diagnostic testing
Bones & Joints
Brain and nerves
Cancer screening
Digestive
Exams & Consultations
Heart & Circulation
Heart health
Imaging referral
Immunizations
Lab tests
Lungs & Breathing
Metabolic & Weight
Minor procedures
Office procedures
Office Procedures
Pain management
Preventive & Routine Care
Screenings & Diagnostics
Sexual health
Procedures Most Often Billed to Medicare
386 services · 345 patients · 13 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
80 | More often than most peers in Internal Medicine |
| Electrocardiogram (ecg) up to 30 days continuous with review and report by health care professional | Treatment | 93228 |
55 | More often than most peers in Internal Medicine |
| Comprehensive electrophysiologic evaluation with catheter destruction of abnormality causing atrial fibrillation (uncoordinated contraction of upper chambers of heart) by pulmonary vein isolation | Treatment | 93656 |
29 | Too few peers to compare |
| External shock to heart to regulate heart beat | Treatment | 92960 |
15 | Less often than most peers in Internal Medicine |
| Comprehensive electrophysiologic evaluation with catheter destruction of abnormality of upper chamber of heart causing supraventricular tachycardia (rapid heart rate) | Treatment | 93653 |
11 | Too few peers to compare |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
48 | As often as other peers in Internal Medicine |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
32 | As often as other peers in Internal Medicine |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
30 | Less often than most peers in Internal Medicine |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
24 | Less often than most peers in Internal Medicine |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
16 | Less often than most peers in Internal Medicine |
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.
Other internists at this location 6
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 7
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.
More connections — 31 related providers in 4 groups
Other internists in Boston 7
Same specialty, same city.
Trained at University of Connecticut School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2014 at University of Connecticut 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 8
Providers in MA who bill this service to Medicare most often.
Common questions
What kind of doctor is William Gionfriddo?
William Gionfriddo is an internist in Boston, MA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
What is William Gionfriddo's address?
William Gionfriddo is listed at 800 Washington St, Boston, MA 02111. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with William Gionfriddo?
The number on file is (617) 636-5000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is William Gionfriddo's NPI number?
William Gionfriddo's National Provider Identifier is 1497167936. 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 William Gionfriddo train?
William Gionfriddo attended University of Connecticut School of Medicine, graduating in 2014. This comes from the CMS National Downloadable File.
CMS public data
How long has William Gionfriddo been practicing?
William Gionfriddo has 12 years experience. Calculated from a graduation year of 2014, reported in the CMS National Downloadable File.
CMS public data
What procedures does William Gionfriddo perform?
According to Medicare billing data, William Gionfriddo provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report and electrocardiogram up to 30 days continuous with review and report by health care professional, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has William Gionfriddo confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by William Gionfriddo. 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.