Quick answers
- Does Maxwell M. Zamzow accept Medicare assignment?
- Yes. Medicare's clinician data says Maxwell M. Zamzow accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Maxwell M. Zamzow see?
- In 2024, CMS data shows 137 Original Medicare patients and 792 services for Maxwell M. Zamzow. This counts Original Medicare only and measures volume, not quality.
- What is Maxwell M. Zamzow's NPI number?
- 1326618281. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Maxwell M. Zamzow, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 137 |
|---|---|
| Services billed to Medicare | 792 |
| Different services or procedures | 67 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)64 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)59 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)58 services
- Blood test, comprehensive group of blood chemicals (80053)31 services
- Hemoglobin a1c level (83036)27 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure74%
- High cholesterol73%
- Arthritis49%
- Diabetes40%
- Chronic kidney disease40%
- Depression34%
Practice locations
Addresses where Maxwell M. Zamzow is enrolled with Medicare (CMS data updated October 2, 2026).
- 2901 174th St NEMarysville, WA 98271 (360) 454‑1900
- 9709 3rd Ave NE, Optum Northgate Plaza Urgent CareSeattle, WA 98115 (206) 401‑3191
Group practices
Medicare enrollment lists Maxwell M. Zamzow as a member of these groups (CMS data updated October 2, 2026).
- Optum Care Washington PLLC683 clinicians in the group
- The Polyclinic PLLC365 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Marysville
Clinicians with the same Medicare primary specialty in Marysville, WA — not a recommendation.
Other clinicians in Optum Care Washington PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1326618281 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians