Hagay Amster Kahn, MD
Hagay Amster Kahn, MD is an Orthopaedic Surgery of the Spine Physician in Seattle, WA, registered under NPI 1457165805.
Getting there
The practice address on file is 550 17TH AVE STE 500, Seattle, WA 98122. 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 |
|---|---|---|
| MDFE.FE.61647630 | WA | Orthopaedic Surgery of the Spine Physician primary |
This provider holds licence MDFE.FE.61647630 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 Orthopaedic Surgery of the Spine covers
Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, orthopaedic surgeons of the spine deal with the evaluation and nonoperative and operative treatment of the full spectrum of primary spinal disorders including trauma, degenerative, deformity, tumor, and reconstructive. NUCC Health Care Provider Taxonomy, code 207XS0117X
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 | 1457165805 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 5, 2025 |
| Last updated | Feb 5, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
550 17TH AVE STE 500 Seattle, WA 98122 (206) 320-2800 |
| Mailing address |
8324 13TH AVENUE NORTHWEST UNIT A Seattle, WA 98117 |
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 | 5 | 7 | 1 | 6 | 5 | 8 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 1 | 7 | 2 | 6 | 1 | 8 | 0 |
Sum = 55 · next multiple of 10 = 60 · check digit = 5 · actual last digit = 5
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.