Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Naili Alexander Chen, D.O., MPH, MASC

Internal Medicine Physician in Lancaster, CA · enumerated 2005 · practices at Antelope Valley Oral Surgery, Dental Group of Gregory R. Urfrig, Dmd A.

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

National Provider Identifier

1649251661

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Naili Alexander Chen

Credential D.O., MPH, MASC

Sex Male

Practice address Lancaster, CA, 93534

Phone (661) 729-8655

Enumeration date Nov 8, 2005

Last updated in NPPES May 20, 2026

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License OS-009459-L (PA) Secondary

2083P0500X Preventive Medicine/Occupational Environmental Medicine Physician Allopathic & Osteopathic Physicians · License 20A7408 (CA) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License OS-009459L (PA) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 20A7048 (CA) Secondary

207PE0004X Emergency Medical Services (Emergency Medicine) Physician Allopathic & Osteopathic Physicians · License 20A7408 (CA) Secondary

2083A0100X Aerospace Medicine Physician Allopathic & Osteopathic Physicians · License 20A7408 (CA) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 20A7408 (CA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
20A7408	Other	CA	BLUE CROSS OF CALIFORNIA

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 1649251661 active?

Yes, as of the latest NPPES snapshot, NPI 1649251661 is active (record last updated 2026-05-20).

How do I verify Naili Chen's NPI record?

Cross-check NPI 1649251661 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Alan Stott General Practice Dentistry · Lancaster, CA NPI 1275612996 Honping Wong General Practice Dentistry · Lancaster, CA NPI 1043362171 Daniel Kim Endodontics · Lancaster, CA NPI 1700070455 Antelope Valley Oral Surgery, Dental Group of Gregory R. Urfrig, Dmd A Oral & Maxillofacial Surgery (D.M.D.) · Lancaster, CA NPI 1619211885 Luiza Portnoff Oral and Maxillofacial Surgery (Dentist) · Lancaster, CA NPI 1003235169 Lloyd Gillett Optometrist · Lancaster, CA NPI 1063271666

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-20.