Denis Mahar
NPI 1841373891 · Family Medicine Physician · Martinez, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Denis Mahar is a Family Medicine Physician provider in Martinez, CA (NPI 1841373891).
Provider details
- NPI number
- 1841373891
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- Yes
- License
- G77241 (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 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 150 | 56 |
| Atorvastatin Calcium | 106 | 41 |
| Spironolactone | 100 | 34 |
| Apixabanbrand: Eliquis | 96 | 28 |
| Amlodipine Besylate | 90 | 30 |
| Losartan Potassium | 71 | 24 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-23
- Last updated
- 2013-06-05
Frequently asked questions
- What is Denis Mahar's NPI number?
- Denis Mahar's National Provider Identifier (NPI) is 1841373891, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Denis Mahar's specialty?
- Denis Mahar is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Denis Mahar located?
- Denis Mahar's practice location on file with NPPES is 2500 Alhambra Ave, Martinez, CA 94553-3156.
- What is Denis Mahar's phone number?
- The practice phone number listed in the NPPES registry for Denis Mahar is (925) 370-5110.
- Does Denis Mahar accept Medicare?
- Denis Mahar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Denis Mahar's NPI active?
- Yes — Denis Mahar's NPI (1841373891) is active in the NPPES registry as of the last update on 2013-06-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.