Sean Hennessey, MD
NPI 1750342242 · Family Medicine Physician · Vallejo, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sean Hennessey, MD is a Family Medicine Physician provider in Vallejo, CA (NPI 1750342242).
Provider details
- NPI number
- 1750342242
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A02736 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,014 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 296 | $143 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 287 | $102 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 141 | $18 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 64 | $16 |
| Administration of Influenza Virus VaccineG0008 | 44 | $37 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 79 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 450 | 133 |
| Losartan Potassium | 243 | 67 |
| Amlodipine Besylate | 221 | 64 |
| Levothyroxine Sodium | 134 | 37 |
| Metformin Hclbrand: Metformin Hcl Er | 107 | 33 |
| Lisinopril | 98 | 32 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-01
- Last updated
- 2023-03-07
Frequently asked questions
- What is Sean Hennessey's NPI number?
- Sean Hennessey's National Provider Identifier (NPI) is 1750342242, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sean Hennessey's specialty?
- Sean Hennessey is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sean Hennessey located?
- Sean Hennessey's practice location on file with NPPES is 100 Hospital Dr, Vallejo, CA 94589-2580.
- What is Sean Hennessey's phone number?
- The practice phone number listed in the NPPES registry for Sean Hennessey is (707) 643-6483.
- Does Sean Hennessey accept Medicare?
- Sean Hennessey is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sean Hennessey's NPI active?
- Yes — Sean Hennessey's NPI (1750342242) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.