Quick answers
- Does Dean G. Mastras accept Medicare assignment?
- Yes. Medicare's clinician data says Dean G. Mastras 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 Dean G. Mastras see?
- In 2024, CMS data shows 188 Original Medicare patients and 4,157 services for Dean G. Mastras. This counts Original Medicare only and measures volume, not quality.
- What is Dean G. Mastras's NPI number?
- 1487625851. 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 Dean G. Mastras, 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 | 188 |
|---|---|
| Services billed to Medicare | 4,157 |
| Different services or procedures | 38 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Ct guidance for insertion of radiation therapy fields (77014)1,814 services
- Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session (G6015)626 services
- Calculation of radiation therapy dose (77300)301 services
- Radiation treatment management, 5 treatment sessions (77427)226 services
- Design and construction of complex radiation treatment device (77334)185 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%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
- Arthritis47%
- Ischemic heart disease32%
- Diabetes27%
Hospitals where Dean G. Mastras works
Medicare's Facility Affiliation Data lists Dean G. Mastras 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.
- St Anthony HospitalGig Harbor, WA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 500151
- St Joseph Medical CenterTacoma, WA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 500108
- St Michael Medical CenterSilverdale, WA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 500039
- 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 Dean G. Mastras is enrolled with Medicare (CMS data updated October 2, 2026).
- 11511 Canterwood Blvd, Suite 50Gig Harbor, WA 98332 (253) 779‑6325
- 1708 Yakima Ave, Suite 115Tacoma, WA 98405 (253) 363‑8780
Group practices
Medicare enrollment lists Dean G. Mastras as a member of these groups (CMS data updated October 2, 2026).
- Tacoma Radiation Oncology Center Inc, PS6 clinicians in the group
- Peninsula Rad Onc Ctr LLC5 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Gig Harbor
Clinicians with the same Medicare primary specialty in Gig Harbor, WA — not a recommendation.
Other clinicians in Tacoma Radiation Oncology Center Inc, PS
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Vermont College Of Medicine |
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1487625851 |
| 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