Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Oswaldo Castro, M.D.

Hematology (Internal Medicine) Physician in Washington, DC · enumerated 2007 · practices at Howard University Hospital.

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

National Provider Identifier

1902022825

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Registry record

Entity type Individual (Type 1)

Name Oswaldo Castro

Credential M.D.

Sex Male

Practice address 520 W Street Nw, Washington, DC, 20059

Phone (202) 865-8291

Fax (202) 232-6719

Enumeration date Apr 18, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207RH0000X Hematology (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License MD25814 (DC) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
0299396-0	Medicaid	DC	-

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

Where does Oswaldo Castro practice?

The practice location on file with NPPES is in Washington, DC. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Oswaldo Castro?

The National Provider Identifier (NPI) for Oswaldo Castro is 1902022825, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Howard University Hospital General Acute Care Hospital · Washington, DC NPI 1730244617

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