Michael Zylstra, MD
NPI 1437679636 · Emergency Medicine Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Zylstra, MD is a Emergency Medicine Physician provider in Seattle, WA (NPI 1437679636).
Provider details
- NPI number
- 1437679636
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 314338 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
21 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 21 | $165 |
Typical Medicare-allowed amounts for these services range $165–$165 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- Madigan Army Medical Center 9040 Jackson AveTacoma, WA 98431-0001Phone: (253) 968-2252
Registry dates
- Enumerated
- 2017-06-20
- Last updated
- 2024-09-18
- Certified
- 2024-09-18
Frequently asked questions
- What is Michael Zylstra's NPI number?
- Michael Zylstra's National Provider Identifier (NPI) is 1437679636, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Zylstra's specialty?
- Michael Zylstra is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Zylstra located?
- Michael Zylstra's practice location on file with NPPES is 325 9th Ave, Seattle, WA 98104-2420.
- What is Michael Zylstra's phone number?
- The practice phone number listed in the NPPES registry for Michael Zylstra is (206) 520-5000.
- Does Michael Zylstra accept Medicare?
- Michael Zylstra is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Zylstra's NPI active?
- Yes — Michael Zylstra's NPI (1437679636) is active in the NPPES registry as of the last update on 2024-09-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.