Chrystina Yu, OD
- Medicare patients, 2024
- 102
- Part D claims, 2024
- 43
- Hospital affiliations
- 2
- Industry payments
- $126
- Medical group
- 1
- Practice address
- 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
- Practice phone
- Call (925) 939-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Chrystina Yu'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.
Chrystina Yu is an optometrist in Walnut Creek, California
Chrystina Yu practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health.
Chrystina Yu's NPI, 1659967685, was assigned on December 14, 2020. Chrystina Yu graduated from University of California - School of Optometry in 2020. Chrystina Yu holds California license OPT34736-TLG.
- NPI
- 1659967685NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7214341213
- NPI enumeration date
- December 14, 2020
- NPI status
- Active
- Practice phone
- (925) 939-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Chrystina Yu practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California
Chrystina Yu's primary practice is John Muir Medical Center, Walnut Creek, at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598 in Contra Costa County. The practice phone is (925) 939-3000.
- John Muir Medical Center, Walnut Creek1601 Ygnacio Valley Rd, Walnut Creek, CA 94598 · Contra Costa CountyPhone(925) 939-3000
Source: Dmand AI Affiliation Data
Chrystina Yu is affiliated with 3 sites of care and 1 medical group
Chrystina Yu's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dmand AI also links Chrystina Yu to 1 hospital, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Chrystina Yu's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Chrystina Yu practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| John Muir Medical Center, Walnut Creek | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across John Muir Health and 6.2K+ hospitals, with verified contacts in the same login.
Chrystina Yu is one of 7,206 optometrists in California
Optometrist is Chrystina Yu's primary specialty in the NPI Registry, under taxonomy code 152W00000X. Chrystina Yu is licensed in California.
Specialties and state licenses
- Optometrist, CaliforniaPrimary
Optometrists near Chrystina Yu
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
Chrystina Yu treated 102 Medicare patients in 2024, average age 74
CMS counts 102 Medicare patients who saw Chrystina Yu in 2024. The largest group is 65 to 74, with 58 patients. 75% of them have high cholesterol, and 54% have high blood pressure. Their average risk score is 0.74, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Chrystina Yu's median patient age at 65, with 67% women.
Chrystina Yu's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chrystina Yu's Medicare patients by sex, 2024
- Women6564%
- Men3736%
Chronic conditions among Chrystina Yu's Medicare patients, 2024
- High cholesterol75%
- High blood pressure54%
- Arthritis34%
- Osteoporosis21%
- Anxiety19%
- Chronic kidney disease19%
- Mood disorders19%
- Depression18%
Share of Medicare patients with each condition. A patient can have several.
Chrystina Yu's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women67%
- Men28%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Chrystina Yu wrote 43 Medicare Part D claims in 2024
In 2024, Chrystina Yu wrote 43 Medicare Part D claims for 13 patients. 67% of them were for generic drugs.
Chrystina Yu's Part D claims by kind of drug, 2024
- Generic29 claims67%
- Brand-name14 claims33%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
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Chrystina Yu received $126 in industry payments in 2025
CMS Open Payments shows 4 general payments to Chrystina Yu from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. CooperVision Inc. paid the most, $69.
Companies that paid Chrystina Yu the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Chrystina Yu graduated from University of California - School of Optometry
Chrystina Yu graduated from University of California - School of Optometry in 2020.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Chrystina Yu'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| 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 Chrystina Yu
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Chrystina Yu's NPI number?
Chrystina Yu's NPI number is 1659967685. It was assigned on December 14, 2020, and it is active in the NPI Registry.
What does Chrystina Yu specialize in?
Chrystina Yu is an optometrist in Walnut Creek, California. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does Chrystina Yu practice?
Chrystina Yu practices at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598. Chrystina Yu's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dmand AI also links Chrystina Yu to 1 hospital, 1 group practice or clinic and 1 medical group.
What is Chrystina Yu's office phone number?
The practice phone on file for Chrystina Yu is (925) 939-3000.
What is Chrystina Yu's medical license number?
Chrystina Yu holds California license OPT34736-TLG.
Which hospitals is Chrystina Yu affiliated with?
Chrystina Yu practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California. Dmand AI links Chrystina Yu to 1 more hospital.
How many Medicare patients does Chrystina Yu see?
CMS counts 102 Medicare patients who saw Chrystina Yu in 2024, with an average age of 74.
Where did Chrystina Yu go to medical school?
Chrystina Yu graduated from University of California - School of Optometry in 2020.
Has Chrystina Yu received payments from drug or device companies?
CMS Open Payments shows $126 in general payments to Chrystina Yu from 2 companies from 2025 to 2025. The largest total came from CooperVision Inc.
How long has Chrystina Yu been practicing?
Chrystina Yu graduated from medical school in 2020, 6 years ago.
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