Thomas Halligan, MD
NPI 1457454761 · Family Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Halligan, MD is a Family Medicine Physician provider in Oakland, CA (NPI 1457454761).
Provider details
- NPI number
- 1457454761
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A71870 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 82 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 385 | 138 |
| Metformin Hclbrand: Metformin Hcl Er | 166 | 62 |
| Amlodipine Besylate | 165 | 58 |
| Losartan Potassium | 156 | 56 |
| Lisinopril | 136 | 47 |
| Levothyroxine Sodium | 113 | 37 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-06
- Last updated
- 2021-12-15
Frequently asked questions
- What is Thomas Halligan's NPI number?
- Thomas Halligan's National Provider Identifier (NPI) is 1457454761, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Halligan's specialty?
- Thomas Halligan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Halligan located?
- Thomas Halligan's practice location on file with NPPES is 1450 Fruitvale Ave, Oakland, CA 94601-2313.
- What is Thomas Halligan's phone number?
- The practice phone number listed in the NPPES registry for Thomas Halligan is (510) 535-2999.
- Does Thomas Halligan accept Medicare?
- Thomas Halligan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Halligan's NPI active?
- Yes — Thomas Halligan's NPI (1457454761) is active in the NPPES registry as of the last update on 2021-12-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.