Douglas Madsen, MD
Douglas Madsen, MD is a Gynecology Physician in Bellingham, WA, registered under NPI 1124082037. 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 4545 CORDATA PKWY, Bellingham, WA 98226. 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 |
|---|---|---|
| MD00022396 | WA | Gynecology Physician primary |
| MD00022396 | WA | Specialist |
This provider holds licence MD00022396 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 Gynecology covers
A physician who specializes in diagnosis, treatment, and management of patients with gynecologic conditions. NUCC Health Care Provider Taxonomy, code 207VG0400X
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 | |
|---|---|---|---|---|
| 207VG0400X | Gynecology Physician Gynecology | MD00022396 | WA | primary |
| 174400000X | Specialist | MD00022396 | WA |
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 | 1124082037 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 17, 2006 |
| Last updated | Oct 4, 2010 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
4545 CORDATA PKWY Bellingham, WA 98226 (360) 738-2200 Fax (360) 752-5687 |
| Mailing address |
PO BOX 5096 Bellingham, WA 98227 |
| Other identifiers |
0243325
· L&I AND CRIME VICTIMS (WA) 1124082037 (WA) 3516MA · REGENCE (WA) 5883376 · AETNA (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 | 1 | 2 | 4 | 0 | 8 | 2 | 0 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 4 | 4 | 0 | 8 | 4 | 0 | 6 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
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.