Saya Hayashi, OD
- Medicare patients, 2024
- 31
- Part D claims, 2024
- 156
- MIPS score, 2024
- 95
- Hospital affiliations
- 1
- Industry payments
- $125
- Practice address
- 15400 Foothill Blvd, Castro Valley, CA 94578
- Practice phone
- Call (510) 895-7230
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
San Leandro Hospital Rehab
Castro Valley, California
Find Saya Hayashi's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Saya Hayashi is an optometrist in Castro Valley, California
Saya Hayashi practices at San Leandro Hospital Rehab in Castro Valley, California.
Saya Hayashi's NPI, 1487378329, was assigned on October 3, 2022. Saya Hayashi graduated from Southern California College of Optometry in 2022. Saya Hayashi holds California license 35294TLG.
- NPI
- 1487378329NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8224407275
- NPI enumeration date
- October 3, 2022
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (510) 895-7230
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 30
- Medical school graduation
- 2022
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Saya Hayashi practices at San Leandro Hospital Rehab in Castro Valley, California
Saya Hayashi's primary practice is San Leandro Hospital Rehab, at 15400 Foothill Blvd, Castro Valley, CA 94578 in Alameda County. The practice phone is (510) 895-7230.
- San Leandro Hospital Rehab15400 Foothill Blvd, Castro Valley, CA 94578 · Alameda CountyPhone(510) 895-7230
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Saya Hayashi is affiliated with 4 sites of care and 4 medical groups
Saya Hayashi's primary practice is San Leandro Hospital Rehab in Castro Valley, California. Saya Hayashi is also affiliated with Alameda Health System - Highland Hospital. The medical group on file is Alameda Health System. Dmand AI also links Saya Hayashi to 3 more medical groups and 2 group practices and clinics, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Saya Hayashi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Saya Hayashi practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| San Leandro Hospital Rehab | Available with a free account |
| +3 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Saya Hayashi is one of 7,206 optometrists in California
Optometrist is Saya Hayashi's primary specialty in the NPI Registry, under taxonomy code 152W00000X. Saya Hayashi is licensed in California.
Specialties and state licenses
- Optometrist, CaliforniaPrimary
Optometrists near Saya Hayashi
Counts of optometrists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Saya Hayashi treated 31 Medicare patients in 2024, average age 72
CMS counts 31 Medicare patients who saw Saya Hayashi in 2024. The largest group is 65 to 74, with 19 patients. 74% of them have high blood pressure, and 39% have high cholesterol. Their average risk score is 1.41, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Saya Hayashi's median patient age at 66, with 56% women.
Saya Hayashi's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Saya Hayashi's Medicare patients by sex, 2024
- Women1135%
- Men2065%
Chronic conditions among Saya Hayashi's Medicare patients, 2024
- High blood pressure74%
- High cholesterol39%
Share of Medicare patients with each condition. A patient can have several.
Saya Hayashi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Saya Hayashi wrote 156 Medicare Part D claims in 2024
In 2024, Saya Hayashi wrote 156 Medicare Part D claims for 48 patients. 30% of them were for generic drugs.
Saya Hayashi's Part D claims by kind of drug, 2024
- Generic47 claims30%
- Brand-name109 claims70%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Saya Hayashi scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Saya Hayashi for performance year 2024, reported as part of a group. Saya Hayashi accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Saya Hayashi's MIPS scores, performance year 2024
- 95of 100Final score
- 86.9of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 73of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Saya Hayashi received $125 in industry payments in 2025
CMS Open Payments shows 1 general payment to Saya Hayashi from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Sun Pharmaceutical Industries Inc. paid the most, $125.
Companies that paid Saya Hayashi the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Saya Hayashi graduated from Southern California College of Optometry
Saya Hayashi graduated from Southern California College of Optometry in 2022.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Saya Hayashi's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Saya Hayashi
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Saya Hayashi's NPI number?
Saya Hayashi's NPI number is 1487378329. It was assigned on October 3, 2022, and it is active in the NPI Registry.
What does Saya Hayashi specialize in?
Saya Hayashi is an optometrist in Castro Valley, California. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does Saya Hayashi practice?
Saya Hayashi practices at 15400 Foothill Blvd, Castro Valley, CA 94578. Saya Hayashi's primary practice is San Leandro Hospital Rehab in Castro Valley, California. Dmand AI also links Saya Hayashi to 3 medical groups and 2 group practices and clinics.
What is Saya Hayashi's office phone number?
The practice phone on file for Saya Hayashi is (510) 895-7230.
What is Saya Hayashi's medical license number?
Saya Hayashi holds California license 35294TLG.
Which hospitals is Saya Hayashi affiliated with?
Saya Hayashi is affiliated with Alameda Health System - Highland Hospital.
What medical group is Saya Hayashi part of?
Saya Hayashi is linked to Alameda Health System. Dmand AI links Saya Hayashi to 3 more medical groups.
Does Saya Hayashi accept Medicare?
Yes. CMS lists Saya Hayashi as accepting Medicare assignment.
What is Saya Hayashi's MIPS score?
Saya Hayashi's MIPS final score for performance year 2024 is 95 out of 100, reported as part of a group.
How many Medicare patients does Saya Hayashi see?
CMS counts 31 Medicare patients who saw Saya Hayashi in 2024, with an average age of 72.
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Where did Saya Hayashi go to medical school?
Saya Hayashi graduated from Southern California College of Optometry in 2022.
Has Saya Hayashi received payments from drug or device companies?
CMS Open Payments shows $125 in general payments to Saya Hayashi from 1 company from 2025 to 2025. The largest total came from Sun Pharmaceutical Industries Inc.
How long has Saya Hayashi been practicing?
Saya Hayashi graduated from medical school in 2022, 4 years ago.
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