Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alfredo Castellanos, M.D.

Critical Care Medicine (Internal Medicine) Physician in Whittier, CA · enumerated 2007.

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

National Provider Identifier

1700088770

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Registry record

Entity type Individual (Type 1)

Name Dr. Alfredo Castellanos

Credential M.D.

Sex Male

Practice address 12462 Putnam St, Suite 208, Whittier, CA, 90602

Phone (562) 789-5470

Fax (562) 789-4480

Enumeration date Jun 1, 2007

Last updated in NPPES Jul 13, 2010

Taxonomy & licenses

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A95095 (CA) Primary

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License A95095 (CA) Secondary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Alfredo Castellanos?

Alfredo Castellanos is registered in NPPES with the primary taxonomy of Critical Care Medicine (Internal Medicine) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-07-13.