Jason Gajarsa, M.D.
NPI 1427256577 · Internal Medicine Physician · Fountain Valley, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jason Gajarsa, M.D. is a Internal Medicine Physician provider in Fountain Valley, CA (NPI 1427256577).
Provider details
- NPI number
- 1427256577
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A99066 (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
18 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 · 44 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Tartrate | 264 | 94 |
| Dabigatran Etexilate Mesylatebrand: Pradaxa | 245 | 82 |
| Losartan Potassium | 229 | 82 |
| Atorvastatin Calcium | 205 | 87 |
| Carvedilol | 184 | 66 |
| Bisoprolol Fumarate | 169 | 60 |
| Lisinopril | 148 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-07-10
- Last updated
- 2021-11-03
- Certified
- 2021-11-03
Frequently asked questions
- What is Jason Gajarsa's NPI number?
- Jason Gajarsa's National Provider Identifier (NPI) is 1427256577, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jason Gajarsa's specialty?
- Jason Gajarsa is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jason Gajarsa located?
- Jason Gajarsa's practice location on file with NPPES is 11180 Warner Ave, Fountain Valley, CA 92708-7501.
- What is Jason Gajarsa's phone number?
- The practice phone number listed in the NPPES registry for Jason Gajarsa is (714) 751-3540.
- Does Jason Gajarsa accept Medicare?
- Jason Gajarsa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jason Gajarsa's NPI active?
- Yes — Jason Gajarsa's NPI (1427256577) is active in the NPPES registry as of the last update on 2021-11-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.