William Gionfriddo, M.D.
NPI 1497167936 · Internal Medicine Physician · Boston, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Gionfriddo, M.D. is a Internal Medicine Physician provider in Boston, MA (NPI 1497167936).
Provider details
- NPI number
- 1497167936
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 260716 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
386 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 80 | $15 |
| Electrocardiogram (ecg) Up to 30 Days Continuous With Review and Report By Health Care Professional93228 | 55 | $25 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 48 | $188 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 32 | $176 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 30 | $121 |
| Comprehensive Electrophysiologic Evaluation With Catheter Destruction of Abnormality Causing Atrial Fibrillation (uncoordinated Contraction of Upper Chambers of Heart) By Pulmonary Vein Isolation |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 102 | 41 |
| Apixabanbrand: Eliquis | 42 | — |
| Flecainide Acetate | 32 | — |
| Amiodarone Hcl | 30 | 11 |
| Dronedarone Hclbrand: Multaq | 27 | 11 |
| Dofetilide | 25 | — |
| Metoprolol Tartrate | 23 | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,007 across 39 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-06-02
- Last updated
- 2014-06-02
Frequently asked questions
- What is William Gionfriddo's NPI number?
- William Gionfriddo's National Provider Identifier (NPI) is 1497167936, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Gionfriddo's specialty?
- William Gionfriddo is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Gionfriddo located?
- William Gionfriddo's practice location on file with NPPES is 800 Washington St, Boston, MA 02111-1552.
- What is William Gionfriddo's phone number?
- The practice phone number listed in the NPPES registry for William Gionfriddo is (617) 636-5000.
- Does William Gionfriddo accept Medicare?
- William Gionfriddo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Gionfriddo's NPI active?
- Yes — William Gionfriddo's NPI (1497167936) is active in the NPPES registry as of the last update on 2014-06-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.