Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Samuel Ryu, M.D.

Radiation Oncology Physician in Stony Brook, NY · enumerated 2006.

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

National Provider Identifier

1639239049

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Registry record

Entity type Individual (Type 1)

Name Samuel Ryu

Credential M.D.

Sex Male

Practice address 101 Nicolls Rd, Levle 2 Radiation Oncology, Stony Brook, NY, 11794

Phone (631) 444-7770

Enumeration date Dec 8, 2006

Last updated in NPPES May 2, 2022

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 4301061949 (MI) Secondary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 206648 (NY) 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
SR061949	Other	-	COMMERCIAL-COMMERCIAL NUMBER
700H262320	Other	-	BLUE CROSS-BLUE CROSS
SR061949	Other	-	CHAMPUS-CHAMPUS
415031010	Medicaid	MI	-

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

Is NPI 1639239049 active?

Yes, as of the latest NPPES snapshot, NPI 1639239049 is active (record last updated 2022-05-02).

How do I verify Samuel Ryu's NPI record?

Cross-check NPI 1639239049 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-05-02.