Arthur Lenahan, MD MPH
Arthur Lenahan, MD MPH is a Ph.D. Medical Genetics Physician in Portland, OR, registered under NPI 1023647062. 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 501 N GRAHAM ST STE 330B, Portland, OR 97227. 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 |
|---|---|---|
| MD220000 | OR | Ph.D. Medical Genetics Physician primary |
This provider holds licence MD220000 issued in OR. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Medical Genetics And Genomics
- PAC ID
- 4587197017
- Enrollment ID
- I20241023000818
Medicare enrolment is recorded as approved under the provider type Practitioner - Medical Genetics And Genomics. 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 Ph.D. Medical Genetics covers
A medical geneticist works in association with a medical specialist, is affiliated with a clinical genetics program and serves as a consultant to medical and dental specialists. NUCC Health Care Provider Taxonomy, code 207SG0205X
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 | |
|---|---|---|---|---|
| 207SG0205X | Ph.D. Medical Genetics Physician Ph.D. Medical Genetics | MD220000 | OR | primary |
| 390200000X | Student in an Organized Health Care Education/Training Program | — | — |
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 | 1023647062 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 2, 2020 |
| Last updated | Feb 14, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD MPH |
| Practice address |
501 N GRAHAM ST STE 330B Portland, OR 97227 (503) 944-5970 |
| Mailing address |
PO BOX 4399 Portland, OR 97208 |
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 | 0 | 2 | 3 | 6 | 4 | 7 | 0 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 4 | 3 | 3 | 4 | 5 | 0 | 3 |
Sum = 48 · next multiple of 10 = 50 · check digit = 2 · actual last digit = 2
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.