Douglas Diehl, M.D.
Douglas Diehl, M.D. is an Addiction Medicine (Anesthesiology) Physician in Medford, OR, registered under NPI 1225128093. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 1025 E MAIN ST, Medford, OR 97504. 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 |
|---|---|---|
| MD23570 | OR | Addiction Medicine (Anesthesiology)… primary |
| MD23570 | OR | Specialist |
This provider holds licence MD23570 issued in OR. 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 Addiction Medicine covers
An anesthesiologist who specializes in the diagnosis and treatment of addictions. NUCC Health Care Provider Taxonomy, code 207LA0401X
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 | |
|---|---|---|---|---|
| 207LA0401X | Addiction Medicine (Anesthesiology) Physician Addiction Medicine | MD23570 | OR | primary |
| 174400000X | Specialist | MD23570 | OR |
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 | 1225128093 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 13, 2006 |
| Last updated | Jun 15, 2021 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | M.D. |
| Practice address |
1025 E MAIN ST Medford, OR 97504 (541) 779-1282 Fax (541) 608-2888 |
| Mailing address |
1003 E MAIN ST STE 104 Medford, OR 97504 |
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 | 2 | 2 | 5 | 1 | 2 | 8 | 0 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 4 | 5 | 2 | 2 | 7 | 0 | 9 |
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.