Justiniano Castro - Montalvo, MD
NPI 1811041114 · Hematology & Oncology Physician · Arecibo, PR
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justiniano Castro - Montalvo, MD is a Hematology & Oncology Physician provider in Arecibo, PR (NPI 1811041114).
Provider details
- NPI number
- 1811041114
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 10600 (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 · 48 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 181 | 32 |
| Gabapentin | 84 | 32 |
| Letrozole | 62 | 11 |
| Tramadol Hcl | 62 | 35 |
| Lenalidomidebrand: Revlimid | 61 | — |
| Fentanyl | 58 | 13 |
| Ondansetronbrand: Ondansetron Odt | 53 | 26 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$20 across 1 record (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
- 2007-01-23
- Last updated
- 2012-02-17
Frequently asked questions
- What is Justiniano Castro - Montalvo's NPI number?
- Justiniano Castro - Montalvo's National Provider Identifier (NPI) is 1811041114, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justiniano Castro - Montalvo's specialty?
- Justiniano Castro - Montalvo is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Justiniano Castro - Montalvo located?
- Justiniano Castro - Montalvo's practice location on file with NPPES is Urb Garcia Calle Andres Garcia No. 53, Arecibo, PR 00612.
- What is Justiniano Castro - Montalvo's phone number?
- The practice phone number listed in the NPPES registry for Justiniano Castro - Montalvo is (787) 817-4973.
- Does Justiniano Castro - Montalvo accept Medicare?
- Justiniano Castro - Montalvo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justiniano Castro - Montalvo's NPI active?
- Yes — Justiniano Castro - Montalvo's NPI (1811041114) is active in the NPPES registry as of the last update on 2012-02-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.