Quick answers
- Does Isaac Fonken accept Medicare assignment?
- Yes. Medicare's clinician data says Isaac Fonken 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 Isaac Fonken see?
- In 2024, CMS data shows 40 Original Medicare patients and 68 services for Isaac Fonken. This counts Original Medicare only and measures volume, not quality.
- What is Isaac Fonken's NPI number?
- 1538665542. 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 Isaac Fonken, 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 | 40 |
|---|---|
| Services billed to Medicare | 68 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)23 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 pressure75%
- High cholesterol65%
- COPD55%
- Arthritis53%
- Ischemic heart disease48%
- Anxiety48%
Hospitals where Isaac Fonken works
Medicare's Facility Affiliation Data lists Isaac Fonken at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Tacoma General Allenmore HospitalTacoma, WA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 500129
Practice locations
Addresses where Isaac Fonken is enrolled with Medicare (CMS data updated October 2, 2026).
Group practices
Medicare enrollment lists Isaac Fonken as a member of this group (CMS data updated October 2, 2026).
- Multicare Health System2,325 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Tacoma
Clinicians with the same Medicare primary specialty in Tacoma, WA — not a recommendation.
Other clinicians in Multicare Health System
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Colorado School Of Medicine, Aurora |
| Graduation year | 2018 (8 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538665542 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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