Guillermo Pastrana Maisonet, MD
NPI 1124307814 · General Practice Physician · San Juan, PR
Enrolled with Medicare as Practitioner - General Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Guillermo Pastrana Maisonet, MD is a General Practice Physician provider in San Juan, PR (NPI 1124307814).
Provider details
- NPI number
- 1124307814
- Entity type
- Individual
- Primary specialty
- General Practice PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 18300 (PR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
14 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 |
|---|---|---|
| Gabapentin | 291 | 99 |
| Atorvastatin Calcium | 259 | 96 |
| Famotidine | 224 | 67 |
| Levocetirizine Dihydrochloride | 200 | 106 |
| Ezetimibe | 188 | 77 |
| Rosuvastatin Calcium | 179 | 70 |
| Losartan Potassium | 171 | 72 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,252 across 17 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-08-11
- Last updated
- 2024-01-25
- Certified
- 2024-01-25
Frequently asked questions
- What is Guillermo Pastrana Maisonet's NPI number?
- Guillermo Pastrana Maisonet's National Provider Identifier (NPI) is 1124307814, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guillermo Pastrana Maisonet's specialty?
- Guillermo Pastrana Maisonet is listed in the NPPES registry with a primary specialty of General Practice Physician (Allopathic & Osteopathic Physicians).
- Where is Guillermo Pastrana Maisonet located?
- Guillermo Pastrana Maisonet's practice location on file with NPPES is 505 Ave Hostos, San Juan, PR 00918-3201.
- What is Guillermo Pastrana Maisonet's phone number?
- The practice phone number listed in the NPPES registry for Guillermo Pastrana Maisonet is (787) 902-6631.
- Does Guillermo Pastrana Maisonet accept Medicare?
- Guillermo Pastrana Maisonet is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Guillermo Pastrana Maisonet's NPI active?
- Yes — Guillermo Pastrana Maisonet's NPI (1124307814) is active in the NPPES registry as of the last update on 2024-01-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.