Greg Matsubara, MD
NPI 1659459568 · Internal Medicine Physician · Fresno, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Greg Matsubara, MD is a Internal Medicine Physician provider in Fresno, CA (NPI 1659459568).
Provider details
- NPI number
- 1659459568
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G72470 (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 · 59 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 383 | 155 |
| Amlodipine Besylate | 216 | 93 |
| Losartan Potassium | 165 | 68 |
| Lisinopril | 156 | 69 |
| Atenolol | 142 | 59 |
| Tamsulosin Hcl | 139 | 59 |
| Famotidine | 117 | 57 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2021-12-01
Frequently asked questions
- What is Greg Matsubara's NPI number?
- Greg Matsubara's National Provider Identifier (NPI) is 1659459568, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Greg Matsubara's specialty?
- Greg Matsubara is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Greg Matsubara located?
- Greg Matsubara's practice location on file with NPPES is 7300 N Fresno St, Fresno, CA 93720-2941.
- What is Greg Matsubara's phone number?
- The practice phone number listed in the NPPES registry for Greg Matsubara is (559) 448-4500.
- Does Greg Matsubara accept Medicare?
- Greg Matsubara is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Greg Matsubara's NPI active?
- Yes — Greg Matsubara's NPI (1659459568) is active in the NPPES registry as of the last update on 2021-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.