Efren Rivera Santiago, MD
NPI 1619138344 · General Practice Physician · Fajardo, PR
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Efren Rivera Santiago, MD is a General Practice Physician provider in Fajardo, PR (NPI 1619138344).
Provider details
- NPI number
- 1619138344
- Entity type
- Individual
- Primary specialty
- General Practice PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 17155 (PR)
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 · 103 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 443 | 93 |
| Losartan Potassium | 277 | 60 |
| Famotidine | 189 | 46 |
| Gabapentin | 175 | 47 |
| Amlodipine Besylate | 154 | 30 |
| Levothyroxine Sodium | 148 | 27 |
| Simvastatin | 138 | 24 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-06-25
- Last updated
- 2019-04-03
Frequently asked questions
- What is Efren Rivera Santiago's NPI number?
- Efren Rivera Santiago's National Provider Identifier (NPI) is 1619138344, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Efren Rivera Santiago's specialty?
- Efren Rivera Santiago is listed in the NPPES registry with a primary specialty of General Practice Physician (Allopathic & Osteopathic Physicians).
- Where is Efren Rivera Santiago located?
- Efren Rivera Santiago's practice location on file with NPPES is F4 Ave Principal, Fajardo, PR 00738.
- What is Efren Rivera Santiago's phone number?
- The practice phone number listed in the NPPES registry for Efren Rivera Santiago is (787) 860-5002.
- Does Efren Rivera Santiago accept Medicare?
- Efren Rivera Santiago is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Efren Rivera Santiago's NPI active?
- Yes — Efren Rivera Santiago's NPI (1619138344) is active in the NPPES registry as of the last update on 2019-04-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.