What is Naili Chen's NPI number?

Naili Chen's National Provider Identifier (NPI) is 1649251661, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Naili Chen's specialty?

Naili Chen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Naili Chen located?

Naili Chen's practice location on file with NPPES is 44439 17th St W, Lancaster, CA 93534-2831.

What is Naili Chen's phone number?

The practice phone number listed in the NPPES registry for Naili Chen is (661) 729-8655.

Is Naili Chen's NPI active?

Yes — Naili Chen's NPI (1649251661) is active in the NPPES registry as of the last update on 2026-05-20.

IndividualActive

Naili Chen, D.O., MPH, MASC

NPI 1649251661 · Internal Medicine Physician · Lancaster, CA

Naili Chen, D.O., MPH, MASC is a Internal Medicine Physician provider in Lancaster, CA (NPI 1649251661).

Provider details

NPI number: 1649251661
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: D.O., MPH, MASC
Sex: Male
Sole proprietor: Yes
License: OS-009459-L (PA)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense 20A7408 (CA)
Allopathic & Osteopathic Physicians
Internal Medicine Physician207R00000XLicense OS-009459-L (PA)
Allopathic & Osteopathic Physicians
Preventive Medicine/Occupational Environmental Medicine Physician2083P0500XLicense 20A7408 (CA)
Allopathic & Osteopathic Physicians
Hospitalist Physician208M00000XLicense OS-009459L (PA)
Allopathic & Osteopathic Physicians
Hospitalist Physician208M00000XLicense 20A7048 (CA)
Allopathic & Osteopathic Physicians
Emergency Medical Services (Emergency Medicine) Physician

Profile Score

Detailed profile(100/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
20 yrs in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
3 documented practice locations

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

44439 17th St W

Lancaster, CA 93534-2831

Phone: (661) 729-8655

Street-level locationGet directions

More CA providers

Mailing address

44439 17th St W

Lancaster, CA 93534-2831

Additional practice locations (2)

3551 Roger Brooke Dr
Fort Sam Houston, TX 78234-4504
Phone: (210) 539-9582
1100 Wilford Hall Loop Bldg 4554
Jbsa Lackland, TX 78236-5638
Phone: (210) 539-9582

Enumerated: 2005-11-08
Last updated: 2026-05-20
Certified: 2026-05-20

Frequently asked questions

What is Naili Chen's NPI number?: Naili Chen's National Provider Identifier (NPI) is 1649251661, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Naili Chen's specialty?: Naili Chen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
Where is Naili Chen located?: Naili Chen's practice location on file with NPPES is 44439 17th St W, Lancaster, CA 93534-2831.
What is Naili Chen's phone number?: The practice phone number listed in the NPPES registry for Naili Chen is (661) 729-8655.
Is Naili Chen's NPI active?: Yes — Naili Chen's NPI (1649251661) is active in the NPPES registry as of the last update on 2026-05-20.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.