Vivian Diaz Melendez, M.D
NPI 1265633135 · Hematology & Oncology Physician · Humacao, PR
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Vivian Diaz Melendez, M.D is a Hematology & Oncology Physician provider in Humacao, PR (NPI 1265633135).
Provider details
- NPI number
- 1265633135
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Female
- Sole proprietor
- Yes
- License
- 16706 (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
19 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 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 467 | 78 |
| Tamoxifen Citrate | 299 | 46 |
| Alendronate Sodium | 199 | 39 |
| Famotidine | 112 | 35 |
| Letrozole | 96 | 15 |
| Dexamethasone | 83 | 24 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 67 | 14 |
| Metoclopramide Hcl | 47 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$595 across 27 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
- 2007-05-30
- Last updated
- 2011-08-15
Frequently asked questions
- What is Vivian Diaz Melendez's NPI number?
- Vivian Diaz Melendez's National Provider Identifier (NPI) is 1265633135, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Vivian Diaz Melendez's specialty?
- Vivian Diaz Melendez is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Vivian Diaz Melendez located?
- Vivian Diaz Melendez's practice location on file with NPPES is #3 Calle Font Martelo, Humacao, PR 00791-0000.
- What is Vivian Diaz Melendez's phone number?
- The practice phone number listed in the NPPES registry for Vivian Diaz Melendez is (787) 960-3314.
- Does Vivian Diaz Melendez accept Medicare?
- Vivian Diaz Melendez is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Vivian Diaz Melendez's NPI active?
- Yes — Vivian Diaz Melendez's NPI (1265633135) is active in the NPPES registry as of the last update on 2011-08-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.