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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Oreste Castellanos, M.D.

Adult Medicine Physician in Mayaguez, PR · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1013945286

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Registry record

Entity type Individual (Type 1)
Name Dr. Oreste Castellanos
Credential M.D.
Sex Male
Practice address Ave Hostos, Centro Medico Ramon E. Betances, Mayaguez, PR, 00682
Phone (787) 834-6070
Fax (787) 834-5535
Enumeration date Jun 28, 2006
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207QA0505X Adult Medicine Physician Allopathic & Osteopathic Physicians · License 9785 (PR) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify Oreste Castellanos's NPI record?
Cross-check NPI 1013945286 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1013945286 active?
Yes, as of the latest NPPES snapshot, NPI 1013945286 is active (record last updated 2007-07-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.