DR. GRANT MASASHI HAYASHI M.D.
NPI 1962405290
Pathology - Anatomic Pathology & Clinical Pathology in Reno, NV

Q: What is Grant Hayashi's NPI number?

The NPI number for Grant Hayashi is 1962405290. It was assigned to this individual provider in the NPPES registry on May 31, 2005.

Q: What is Grant Hayashi's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Q: When was this NPI record last updated?

The NPPES record for Grant Hayashi was last updated on July 9, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since May 31, 2005PECOS EnrolledAccepts Medicare Assignment

81.78/100

CMS Quality Rating

1350 STARDUST ST, STE D, RENO, NV 89503(775) 746-3400(775) 746-3411 Get Directions Write a Review

NPPES record last updated: July 9, 2007. Verified against the NPPES registry weekly; last sync: November 01, 2026.

On this page

About Dr. Grant Masashi Hayashi M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GRANT MASASHI HAYASHI M.D. (NPI 1962405290) is an individual anatomic pathology & clinical pathology provider in Reno, Nevada, licensed in Nevada (9368) and active in the NPI registry since May 2005. He is enrolled in Medicare PECOS, is affiliated with Carson Tahoe Regional Medical Center, and is a graduate of University Of Hawaii John A. Burns School Of Medicine (1994).

NPPES Registry Identity

NPI1962405290

Entity TypeIndividualMale

Primary Taxonomy207ZP0102X

Provider Legal NameDR. GRANT MASASHI HAYASHICredential: M.D.

Location Address1350 STARDUST ST, STE DReno, NV 89503-4264

Mailing Address1350 Stardust St, Ste DReno, NV 89503-4264 · (775) 746-3400 · Fax (775) 746-3411

Phone(775) 746-3400

Fax(775) 746-3411

Sole ProprietorNo

Medical School CMSUniversity Of Hawaii John A. Burns School Of MedicineGraduated 1994

Enumeration DateMay 31, 2005

Last NPPES UpdateJuly 9, 2007

✔ NPI 1962405290 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians

Taxonomy Code207ZP0102X

Licenses✔ Licensed in NV · 9368✔ Licensed in CA · A55802

Definition

A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.

1350 STARDUST ST, Reno, NV 89503

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Other Identifiers 3

Medicare UPINH61146NV

OtherXPY068120NV · Medical

Medicare ID-Type UnspecifiedV9L0008062NV

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Grant Masashi Hayashi M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5799797668

PECOS Enrollment IDI20060613000243, I20160209002839

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Grant Hayashi reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Diagnostic Pathology Medical Group, Inc.

23 mi

Anatomic Pathology & Clinical Pathology

1600 MEDICAL PKWY
Carson City, NV 89703

Reassigned Medicare billing, Nevada and California enrollments
Also billed through NPI 1609948983 (California)
6 clinicians in this Medicare group

NPI 1417636093 (916) 447-6267

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 17

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Pathology examination of tissue using a microscope, intermediate complexity 88305

A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.

601 services389 patients

Special stained specimen slides to examine tissue, each additional procedure 88341

Special stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.

311 services103 patients

Special stained specimen slides to examine tissue, initial procedure 88342

This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.

220 services183 patients

Pathology examination of tissue using a microscope, moderately high complexity 88307

A pathology examination of tissue with moderate complexity involves a detailed study of a small tissue sample from your body. Using a microscope, experts analyze the tissue's structure and cells to identify any abnormalities. This helps in diagnosing various health conditions accurately.

128 services93 patients

Pathology examination of tissue using a microscope, moderately low complexity 88304

A pathology examination of tissue, moderately low complexity, involves studying a small sample of your body tissue under a microscope. It helps to identify any abnormal cells or diseases. It's a routine procedure, not complex, and provides crucial insights for your diagnosis.

86 services76 patients

Pathology examination of tissue using a microscope, intermediate complexity 88305

75 services66 patients

Microscopic genetic analysis of tumor, manual 88360

Microscopic genetic analysis of a tumor involves examining your tumor's genes under a microscope. This helps identify specific genetic changes in the tumor cells. This information can aid in diagnosing, predicting disease progression, and determining the most effective treatment options.

75 services30 patients

Evaluation of fine needle aspirate with interpretation and report 88173

This procedure involves using a thin needle to collect a small sample from an abnormal area or lump. The sample is then examined under a microscope to identify any potential issues. A report of the findings is provided for further analysis.

65 services46 patients

Cell examination of specimen, selective cellular enhancement technique 88112

Cell examination of a specimen using selective cellular enhancement technique is a lab process that improves the visibility of certain cells in a sample. It helps in identifying abnormalities or diseases. The process is non-invasive, safe, and aids in accurate diagnosis.

63 services50 patients

Pathology examination of tissue using a microscope, limited examination 88300

A pathology examination of tissue using a microscope is a procedure where a small sample of your tissue is observed under a microscope. This limited examination helps identify any abnormal cells or signs of disease, aiding in accurate diagnosis and treatment planning.

53 services42 patients

Preparation of tissue for examination by removing any calcium present 88311

This procedure involves treating tissue samples to remove any calcium, which can interfere with the examination. The tissue is soaked in a special solution that safely dissolves the calcium, leaving the tissue intact for accurate analysis. This helps in making precise diagnoses.

52 services47 patients

Special stained specimen slides to examine tissue including interpretation and report 88313

Special stained specimen slides are used to examine tissue samples. This involves applying special dyes to the tissue, which helps to highlight certain features under a microscope. The findings are then interpreted and a report is provided. This can aid in diagnosing various health conditions.

50 services31 patients

Blood smear interpretation by physician with written report 85060

Blood smear interpretation is a lab test where your doctor examines a sample of your blood under a microscope. They look for abnormalities in your blood cells which can help diagnose various conditions. You'll receive a written report of the findings.

35 services33 patients

Cell examination of body fluid, smears 88104

Cell examination of body fluid, or smear, is a laboratory test where a sample of your body fluid is taken. It's then thinly spread on a glass slide and examined under a microscope to check for abnormalities. This can help diagnose various health conditions.

21 services18 patients

Special stained specimen slides to identify organisms including interpretation and report 88312

This service involves coloring specimen slides in a special way to help identify organisms. The colors make different parts of the organism stand out. Afterward, a detailed interpretation and report on the findings are provided.

19 services12 patients

Pathology examination of tissue using a microscope, high complexity 88309

A high complexity pathology examination involves studying body tissue under a microscope to identify any abnormalities. This intricate process helps in diagnosing various conditions and deciding on the best treatment plan.

13 services13 patients

Pathology examination of specimen during surgery 88329

A pathology examination during surgery involves taking a small sample of tissue for testing while the operation is ongoing. This helps the surgeon make immediate decisions about your treatment. The sample is examined under a microscope by a pathologist to identify any abnormal cells or conditions.

13 services13 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Carson Tahoe Regional Medical Center

Acute Care Hospitals · Carson City, NV

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number290019

Location1600 Medical ParkwayCarson City, NV 89703 · Carson City County

Emergency services Birthing friendly

Carson Valley Health

Critical Access Hospitals · Gardnerville, NV

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number291306

Location1107 Highway 395Gardnerville, NV 89410 · Douglas County

Emergency services

University Of Utah Hospitals And Clinics

Acute Care Hospitals · Salt Lake City, UT

5/5 CMS rating

OwnershipGovernment - State

CMS Certification Number460009

Location50 North Medical DriveSalt Lake City, UT 84132 · Salt Lake County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 89503 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$131.25 typical visit price

range $57.07 – $173.24

Typical copayment $32.81 (range $14.26 – $43.31)

Most-billed visit code 99204

Established Patient

$100.60 typical visit price

range $18.27 – $140.96

Typical copayment $25.15 (range $4.56 – $35.24)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

81.78/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

78.57

Improvement Activities

Other Providers at the Same Location NPPES 8

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. EDWIN STEVEN SWEENEY M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1350 STARDUST ST, STE D
RENO, NV 89503

Washoe County (775) 746-3400

DR. DONALD JAMES LAWRIE JR. M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1350 STARDUST ST, STE D
RENO, NV 89503

Washoe County (775) 746-3400

DR. GLEN THOMAS SEWELL M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1350 STARDUST ST, STE D
RENO, NV 89503

Washoe County (775) 746-3400

DR. GREGG WAYNE MANSON M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1350 STARDUST ST, STE D
RENO, NV 89503

Washoe County (775) 746-3400

DR. BRIAN NEIL DAVIS M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1350 STARDUST ST, SUITE D
RENO, NV 89503

Washoe County (775) 746-3400

NEVADA HISTOLOGY, INC.

Clinical Medical Laboratory

1350 STARDUST ST, SUITE D
RENO, NV 89503

Washoe County (775) 747-2211

DR. WEN HOO CHUAN M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1350 STARDUST ST, STE D
RENO, NV 89503

Washoe County (775) 746-3400

DR. MYLINH THI MAC M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1350 STARDUST ST, SUITE D
RENO, NV 89503

Washoe County (775) 746-3400

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Grant Hayashi's NPI number?

The NPI number for Grant Hayashi is 1962405290. It was assigned to this individual provider in the NPPES registry on May 31, 2005.

Where is Grant Hayashi located?

Grant Hayashi practices at 1350 Stardust St Ste D, Reno, NV 89503. The listed phone number is (775) 746-3400.

What is Grant Hayashi's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Grant Hayashi enrolled in Medicare?

Yes. Grant Hayashi is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Grant Hayashi's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Grant Hayashi reassigns Medicare benefits to Diagnostic Pathology Medical Group, Inc. (Carson City, NV). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Grant Hayashi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Grant Hayashi affiliated with any hospitals?

According to CMS data, Grant Hayashi is affiliated with Carson Tahoe Regional Medical Center, Carson Valley Health and University Of Utah Hospitals And Clinics.

When was this NPI record last updated?

The NPPES record for Grant Hayashi was last updated on July 9, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.