Quick answers
- Does Grant M. Hayashi accept Medicare assignment?
- Yes. Medicare's clinician data says Grant M. Hayashi 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 Grant M. Hayashi see?
- In 2024, CMS data shows 699 Original Medicare patients and 1,996 services for Grant M. Hayashi. This counts Original Medicare only and measures volume, not quality.
- What is Grant M. Hayashi's NPI number?
- 1962405290. 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 Grant M. Hayashi, 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 | 699 |
|---|---|
| Services billed to Medicare | 1,996 |
| Different services or procedures | 31 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Pathology examination of tissue using a microscope, intermediate complexity (88305)676 services
- Special stained specimen slides to examine tissue, each additional procedure (88341)311 services
- Special stained specimen slides to examine tissue, initial procedure (88342)220 services
- Pathology examination of tissue using a microscope, moderately high complexity (88307)128 services
- Pathology examination of tissue using a microscope, moderately low complexity (88304)86 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 pressure71%
- Arthritis46%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)30%
- Ischemic heart disease29%
- Diabetes27%
Hospitals where Grant M. Hayashi works
Medicare's Facility Affiliation Data lists Grant M. Hayashi 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.
- Carson Tahoe Regional Medical CenterCarson City, NV · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 290019
- Carson Valley HealthGardnerville, NV · Critical Access Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 291306
- University of Utah Hospital and ClinicsSalt Lake City, UT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 460009
Practice locations
Addresses where Grant M. Hayashi is enrolled with Medicare (CMS data updated October 2, 2026).
- 1600 Medical PkwyCarson City, NV 89703 (916) 447‑6267
- 3301 C StSacramento, CA 95816 (916) 446‑0424
Group practices
Medicare enrollment lists Grant M. Hayashi as a member of this group (CMS data updated October 2, 2026).
- Diagnostic Pathology Medical Group Inc31 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Carson City
Clinicians with the same Medicare primary specialty in Carson City, NV — not a recommendation.
Other clinicians in Diagnostic Pathology Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Hawaii John A. Burns School Of Medicine |
| Graduation year | 1994 (32 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962405290 |
| 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