Quick answers
- Does Mark L. Anstadt accept Medicare assignment?
- Yes. Medicare's clinician data says Mark L. Anstadt 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 Mark L. Anstadt see?
- In 2024, CMS data shows 125 Original Medicare patients and 1,135 services for Mark L. Anstadt. This counts Original Medicare only and measures volume, not quality.
- What is Mark L. Anstadt's NPI number?
- 1144414145. 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 Mark L. Anstadt, 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 | 125 |
|---|---|
| Services billed to Medicare | 1,135 |
| Different services or procedures | 35 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Blood test, lipids (cholesterol and triglycerides) (80061)173 services
- Insertion of needle into vein for collection of blood sample (36415)164 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)155 services
- Measurement c-reactive protein for detection of infection or inflammation, high sensitivity (86141)154 services
- Blood glucose (sugar) level (82947)133 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 cholesterol75%
- Ischemic heart disease62%
- High blood pressure58%
- Arthritis50%
- Osteoporosis24%
- Chronic kidney disease18%
Practice locations
Addresses where Mark L. Anstadt is enrolled with Medicare (CMS data updated October 2, 2026).
- 1303 Pacific AveEverett, WA 98201 (425) 339‑5476
- 904 7th AveSeattle, WA 98104 (206) 309‑1760
- 912 32nd St, Suite AAnacortes, WA 98221 (360) 466‑3136
Group practices
Medicare enrollment lists Mark L. Anstadt 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 Everett
Clinicians with the same Medicare primary specialty in Everett, 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 |
|---|---|
| School | University Of Washington School Of Medicine |
| Graduation year | 2007 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1144414145 |
| 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