Quick answers
- Does Garrett S. Matsunaga accept Medicare assignment?
- Yes. Medicare's clinician data says Garrett S. Matsunaga 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 Garrett S. Matsunaga see?
- In 2024, CMS data shows 1,683 Original Medicare patients and 30,237 services for Garrett S. Matsunaga. This counts Original Medicare only and measures volume, not quality.
- What is Garrett S. Matsunaga's NPI number?
- 1740201623. 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 Garrett S. Matsunaga, 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 | 1,683 |
|---|---|
| Services billed to Medicare | 30,237 |
| Different services or procedures | 111 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Injection, testosterone cypionate, 1 mg (J1071)9,950 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)1,512 services
- Automated urinalysis test (81003)1,437 services
- Bcg live intravesical instillation, 1 mg (J9030)1,328 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,263 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%
- High blood pressure74%
- Arthritis38%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)30%
- Diabetes29%
- Ischemic heart disease27%
Hospitals where Garrett S. Matsunaga works
Medicare's Facility Affiliation Data lists Garrett S. Matsunaga 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.
- Memorialcare Long Beach Medical CenterLong Beach, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050485
- Providence Little Company of Mary Medical Center TorranceTorrance, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: not listed by Medicare · CCN 050353
- Torrance Memorial Medical CenterTorrance, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050351
Practice locations
Addresses where Garrett S. Matsunaga is enrolled with Medicare (CMS data updated October 2, 2026).
- 20911 Earl St, Suite 140Torrance, CA 90503 (310) 542‑0199
Group practices
Medicare enrollment lists Garrett S. Matsunaga as a member of this group (CMS data updated October 2, 2026).
- Genesis Healthcare Partners PC228 clinicians in the group
Specialties
- Urologyprimary
Other urologists in Torrance
Clinicians with the same Medicare primary specialty in Torrance, CA — not a recommendation.
Other clinicians in Genesis Healthcare Partners PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At San Antonio |
| Graduation year | 2000 (26 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1740201623 |
| 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