John Schweitzer, MD
John Schweitzer, MD is a Neuropathology Physician in Johnson City, TN, registered under NPI 1609929991. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is ETSU COLLEGE OF MEDICINE-DEPT OF PATHOLOGY BLDG 1, Johnson City, TN 37614. 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
| Licence | State | Specialty |
|---|---|---|
| 16660 | TN | Neuropathology Physician primary |
| 16660 | TN | Anatomic Pathology Physician |
This provider holds licence 16660 issued in TN. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Neuropathology covers
A neuropathologist is expert in the diagnosis of diseases of the nervous system and skeletal muscles and functions as a consultant primarily to neurologists and neurosurgeons. The neuropathologist is knowledgeable in the infirmities of humans as they affect the nervous and neuromuscular systems, be they degenerative, infectious, metabolic, immunologic, neoplastic, vascular or physical in nature. NUCC Health Care Provider Taxonomy, code 207ZN0500X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207ZN0500X | Neuropathology Physician Neuropathology | 16660 | TN | primary |
| 207ZP0101X | Anatomic Pathology Physician Anatomic Pathology | 16660 | TN |
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-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1609929991 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 19, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
ETSU COLLEGE OF MEDICINE-DEPT OF PATHOLOGY BLDG 1 Johnson City, TN 37614 (423) 439-6210 |
| Mailing address |
PO BOX 699 Mountain Home, TN 37684 |
| Other identifiers |
MD16660
· Other (TN) |
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 | 6 | 0 | 9 | 9 | 2 | 9 | 9 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 0 | 9 | 9 | 2 | 9 | 9 | 9 |
Sum = 79 · next multiple of 10 = 80 · check digit = 1 · actual last digit = 1
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.