First Docs
First Docs holds 5 active organization NPIs in the federal registry, with practice locations in 5 cities in 3 states. All list internal medicine physician as their primary taxonomy; each location can bill under its own NPI.
Search the organization with your city to find the NPI for the location you visit or bill.
Find a location's NPINaperville, IL has the most NPIs, 1
Source: CMS NPPES monthly file of Aug 9, 2026, organization NPIs by practice city.
Most NPIs were issued in 2020 and 2026
Source: CMS NPPES, enumeration dates.
3 NPIs were issued in 2026 alone, more than in any other year; none in 4 of the years between.
Naperville, IL locations
The city with the most First Docs NPIs. The full list of all 5 follows.
| NPI | Location | Primary taxonomy | Issued |
|---|---|---|---|
| 1417655465 | 1525 OXFORD LN, Naperville, IL | Internal Medicine Physician | Feb 20, 2023 |
All 5 locations, by state and city
| NPI | Location | Primary taxonomy | Issued |
|---|---|---|---|
| 1417655465 | 1525 OXFORD LN, Naperville, IL | Internal Medicine Physician | Feb 20, 2023 |
| 1982553244 | 347 BALLENGER CENTER DR, Frederick, MD | Internal Medicine Physician | Jan 28, 2026 |
| 1700739976 | 430 W MARKET ST, Snow Hill, MD | Internal Medicine Physician | Feb 18, 2026 |
| 1366391625 | 56 W FREDERICK ST, Walkersville, MD | Internal Medicine Physician | Jan 28, 2026 |
| 1154936227 | 1235 WHITEHORSE MERCERVILLE RD STE 306, Hamilton, NJ | Internal Medicine Physician | Sep 15, 2020 |
Checking an organization
- Match the NPI to the exact location you will visit or bill; each location can have its own.
- Confirm the business entity with the secretary of state.
- Check the HHS-OIG exclusion list for the organization and its owners.
- Verify each clinician you will see on their own record and with the state license search.
Common questions
Why does First Docs have 5 NPIs?
An organization may obtain more than one Type 2 NPI, for example for separate locations or units that bill on their own. First Docs's NPIs list practice locations in 5 cities.
Is an organization NPI a license?
No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.
Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.