FIRST DOCS PC
FIRST DOCS PC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1417655465, based in Naperville, IL. The organization lists 3 taxonomy classifications, with Internal Medicine Physician recorded as primary.
Getting there
The practice address on file is 1525 OXFORD LN, Naperville, IL 60565. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
- Status
- Approved
- Provider type
- Part B Supplier - Clinic/group Practice
- PAC ID
- 0547626871
Enrolled in Medicare 12 times, across 12 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Tennessee | O20230511002435 | Part B Supplier - Clinic/group Practice |
| South Dakota | O20230515002474 | Part B Supplier - Clinic/group Practice |
| Wisconsin | O20230821002474 | Part B Supplier - Clinic/group Practice |
| Maryland | O20240301002976 | Part B Supplier - Clinic/group Practice |
| South Carolina | O20240315000356 | Part B Supplier - Clinic/group Practice |
| Illinois | O20240514000701 | Part B Supplier - Clinic/group Practice |
| Florida | O20240606002364 | Part B Supplier - Clinic/group Practice |
| New York | O20240702000192 | Part B Supplier - Clinic/group Practice |
| Delaware | O20240826000019 | Part B Supplier - Clinic/group Practice |
| California | O20250423003020 | Part B Supplier - Clinic/group Practice |
| Texas | O20250613001609 | Part B Supplier - Clinic/group Practice |
| District of Columbia | O20260206001814 | Part B Supplier - Clinic/group Practice |
Medicare enrolment is recorded as approved under the provider type Part B Supplier - Clinic/group Practice. There are 12 separate enrolment records across 12 states (TN, SD, WI, MD, SC, IL, FL, NY, DE, CA, TX, DC). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Internal Medicine covers
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs. NUCC Health Care Provider Taxonomy, code 207R00000X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | — | — | primary |
| 208M00000X | Hospitalist Physician | — | — | |
| 208100000X | Physical Medicine & Rehabilitation Physician | — | — |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1417655465 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Feb 20, 2023 |
| Last updated | May 27, 2026 |
| Status | Active |
| Practice address |
1525 OXFORD LN Naperville, IL 60565 (702) 762-2485 Fax (609) 585-0309 |
| Mailing address |
PO BOX 7411009 Chicago, IL 60674 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 4 | 1 | 7 | 6 | 5 | 5 | 4 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 2 | 7 | 3 | 5 | 1 | 4 | 3 |
Sum = 55 · next multiple of 10 = 60 · check digit = 5 · actual last digit = 5
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.