Paul Johnson, M.D.
Paul Johnson, M.D. is a General Practice Physician in Chestertown, MD, registered under NPI 1902830433. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 400 S CROSS ST SUITE 1, Chestertown, MD 21620. 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 |
|---|---|---|
| D0052487 | MD | General Practice Physician primary |
| D0052487 | MD | Vascular Surgery Physician |
| D0052487 | MD | Thoracic Surgery (Cardiothoracic Vascular… |
This provider holds licence D0052487 issued in MD. 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 General Practice covers
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions. NUCC Health Care Provider Taxonomy, code 208D00000X
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 | |
|---|---|---|---|---|
| 208D00000X | General Practice Physician | D0052487 | MD | primary |
| 2086S0129X | Vascular Surgery Physician Vascular Surgery | D0052487 | MD | |
| 208G00000X | Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician | D0052487 | MD |
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 | 1902830433 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 10, 2006 |
| Last updated | Feb 29, 2008 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
400 S CROSS ST SUITE 1 Chestertown, MD 21620 (410) 778-0088 Fax (410) 778-9592 |
| Mailing address |
PO BOX 1079 Chestertown, MD 21651 |
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 | 9 | 0 | 2 | 8 | 3 | 0 | 4 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 0 | 2 | 7 | 3 | 0 | 4 | 6 |
Sum = 57 · next multiple of 10 = 60 · check digit = 3 · actual last digit = 3
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.