Quick answers
- Does Roland K. Tam accept Medicare assignment?
- Yes. Medicare's clinician data says Roland K. Tam 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 Roland K. Tam see?
- In 2024, CMS data shows 174 Original Medicare patients and 217 services for Roland K. Tam. This counts Original Medicare only and measures volume, not quality.
- What is Roland K. Tam's NPI number?
- 1154403681. 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 Roland K. Tam, 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 | 174 |
|---|---|
| Services billed to Medicare | 217 |
| Different services or procedures | 43 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Anesthesia for procedure to assess heart electrical activity (00537)25 services
- Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)23 services
- Insertion of artery tube for blood sampling or infusion through skin (36620)18 services
- Anesthesia for procedure for total knee joint replacement (01402)15 services
- Ultrasonic guidance for blood vessel access (76937)14 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 cholesterol75%
- Arthritis56%
- Diabetes41%
- Atrial fibrillation41%
- Chronic kidney disease38%
Hospitals where Roland K. Tam works
Medicare's Facility Affiliation Data lists Roland K. Tam 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.
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050180
- Legacy Good Samaritan Medical CenterPortland, OR · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 380017
- Legacy Meridian Park Medical CenterTualatin, OR · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 380089
- Memorialcare Long Beach Medical CenterLong Beach, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050485
Practice locations
Addresses where Roland K. Tam is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 1015 NW 22nd AvePortland, OR 97210 (503) 299‑9906
- 1601 Ygnacio Valley RdWalnut Creek, CA 94598 (925) 939‑3000
- 2000 Mowry AveFremont, CA 94538 (510) 797‑1111
- 24451 Health Ctr DrLaguna Hills, CA 92653 (949) 837‑4500
- 26357 McBean Pkwy, Suite 100Santa Clarita, CA 91355 (661) 799‑8300
Group practices
Medicare enrollment lists Roland K. Tam as a member of these groups (CMS data updated October 2, 2026).
- Cep America - Anesthesia PC849 clinicians in the group
- Oregon Anesthesiology Group PC232 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Portland
Clinicians with the same Medicare primary specialty in Portland, OR — not a recommendation.
Other clinicians in Cep America - Anesthesia PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Albert Einstein College Of Medicine Of Yeshiva University |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154403681 |
| 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