Duncan Landreth, MD
Duncan Landreth, MD is a Cardiovascular Disease Physician in Mount Vernon, WA, registered under NPI 1467497321.
Getting there
The practice address on file is 307 S. 13TH STREET, SUITE 300, Mount Vernon, WA 98274. 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 |
|---|---|---|
| MD00020573 | WA | Cardiovascular Disease Physician primary |
This provider holds licence MD00020573 issued in WA. 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 Cardiovascular Disease covers
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms. NUCC Health Care Provider Taxonomy, code 207RC0000X
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 | 1467497321 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 17, 2006 |
| Last updated | Feb 26, 2014 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
307 S. 13TH STREET, SUITE 300 Mount Vernon, WA 98274 (360) 336-9757 Fax (360) 336-2088 |
| Mailing address |
1400 E KINCAID ST SKAGIT REGIONAL CLINICS, ATTN: CREDENTIALING Mount Vernon, WA 98274 |
| Other identifiers |
1467497321
(WA) 263566 · LABOR & INDUSTRIES (WA) |
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 | 6 | 7 | 4 | 9 | 7 | 3 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 3 | 7 | 8 | 9 | 5 | 3 | 4 |
Sum = 69 · next multiple of 10 = 70 · 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.