What is James Dan's NPI number?

James Dan's National Provider Identifier (NPI) is 1841265964, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is James Dan's specialty?

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

Where is James Dan located?

James Dan's practice location on file with NPPES is 3743 Highland Ave, Downers Grove, IL 60515-1594.

What is James Dan's phone number?

The practice phone number listed in the NPPES registry for James Dan is (630) 435-9888.

Is James Dan's NPI active?

Yes — James Dan's NPI (1841265964) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

James Dan, MD

NPI 1841265964 · Geriatric Medicine (Internal Medicine) Physician · Downers Grove, IL

James Dan, MD is a Geriatric Medicine (Internal Medicine) Physician provider in Downers Grove, IL (NPI 1841265964).

Provider details

NPI number: 1841265964
Entity type: Individual
Primary specialty: Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
Sole proprietor: No

Specialties & taxonomies

Geriatric Medicine (Internal Medicine) PhysicianPrimary207RG0300X
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(84/100 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
83% of core fields populated
Practice footprint23% of score
1 documented practice location

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

3743 Highland Ave

Ste 1001

Downers Grove, IL 60515-1594

Phone: (630) 435-9888

Street-level locationGet directions

More IL providers

Mailing address

1860 Paysphere Cir

Chicago, IL 60674-0018

Enumerated: 2006-02-22
Last updated: 2007-07-08

Frequently asked questions

What is James Dan's NPI number?: James Dan's National Provider Identifier (NPI) is 1841265964, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is James Dan's specialty?: James Dan is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
Where is James Dan located?: James Dan's practice location on file with NPPES is 3743 Highland Ave, Downers Grove, IL 60515-1594.
What is James Dan's phone number?: The practice phone number listed in the NPPES registry for James Dan is (630) 435-9888.
Is James Dan's NPI active?: Yes — James Dan's NPI (1841265964) is active in the NPPES registry as of the last update on 2007-07-08.

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