Stephanie Martha Chiu, NP
- Part D claims, 2026
- 584
- Hospital affiliations
- 2
- Industry payments
- $2,147
- Medical group
- 1
- State license
- 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
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Stephanie Martha Chiu is a nurse practitioner in Walnut Creek, California
Stephanie Chiu practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health.
Stephanie Chiu's NPI, 1043091663, was assigned on October 10, 2023. Stephanie Chiu holds California license 95027633.
- NPI
- 1043091663NPI Registry (opens in a new tab)
- NPI enumeration date
- October 10, 2023
- NPI status
- Active
- Practice phone
- (925) 939-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Stephanie Martha Chiu practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California
Stephanie Chiu'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
Stephanie Martha Chiu is affiliated with 3 sites of care and 1 medical group
Stephanie Chiu's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. The medical group on file is Contra Costa Oncology. Dmand AI also links Stephanie Chiu to 1 more hospital and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Stephanie Martha Chiu's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Stephanie Chiu 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 affiliated sites | 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.
Stephanie Martha Chiu is one of 5,983 nurse practitioners in California
Nurse practitioner is Stephanie Chiu's primary specialty in the NPI Registry, under taxonomy code 363L00000X. Stephanie Chiu is licensed in California.
Specialties and state licenses
- Nurse practitioner, CaliforniaPrimary
Nurse practitioners near Stephanie Chiu
Counts of nurse practitioners 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
Stephanie Martha Chiu's patients have a median age of 68
Across all payers, Dmand AI patient panel data puts Stephanie Chiu's median patient age at 68, with 59% women.
Stephanie Chiu's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women59%
- Men38%
Source: Dmand AI Patient Panel Data
Stephanie Martha Chiu wrote 584 Medicare Part D claims in 2026
In 2026, Stephanie Chiu wrote 584 Medicare Part D claims for 158 patients. 86% of them were for generic drugs.
Stephanie Chiu's Part D claims by kind of drug, 2026
- Generic503 claims86%
- Brand-name81 claims14%
Drug classes CMS tracks in Stephanie Chiu's Part D claims, 2026
- Opioids2%14 of 584 claims
- Antibiotics8%47 of 584 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2026 data
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Stephanie Martha Chiu received $2,147 in industry payments in 2025
CMS Open Payments shows 87 general payments to Stephanie Chiu from 32 drug and device companies in 2025. Food and beverage make up the largest share, 95% of the total. AstraZeneca Pharmaceuticals LP paid the most, $399.
General payments to Stephanie Chiu by kind, 2025 to 2025
- Food and beverage$2,04795%
- Education$1005%
Companies that paid Stephanie Chiu the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Stephanie Martha Chiu'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 Data |
| 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) |
| 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 Stephanie Martha Chiu
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Stephanie Martha Chiu's NPI number?
Stephanie Martha Chiu's NPI number is 1043091663. It was assigned on October 10, 2023, and it is active in the NPI Registry.
What does Stephanie Martha Chiu specialize in?
Stephanie Martha Chiu is a nurse practitioner in Walnut Creek, California. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does Stephanie Martha Chiu practice?
Stephanie Chiu practices at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598. Stephanie Chiu's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dmand AI also links Stephanie Chiu to 1 hospital and 1 group practice or clinic, and a free account names each one.
What is Stephanie Martha Chiu's office phone number?
The practice phone on file for Stephanie Chiu is (925) 939-3000. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Stephanie Martha Chiu's email address?
Dmand AI checks professional and personal email addresses for Stephanie Chiu through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Stephanie Martha Chiu's medical license number?
Stephanie Chiu holds California license 95027633.
Which hospitals is Stephanie Martha Chiu affiliated with?
Stephanie Chiu practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California. Dmand AI links Stephanie Chiu to 1 more hospital, named with a free account.
What medical group is Stephanie Martha Chiu part of?
Stephanie Chiu is linked to Contra Costa Oncology.
Who does Stephanie Martha Chiu practice with?
Dmand AI links 7 HCPs to Stephanie Chiu's primary medical group, 1 of them nurse practitioner. A free account lists them, with verified contacts.
Has Stephanie Martha Chiu received payments from drug or device companies?
CMS Open Payments shows $2,147 in general payments to Stephanie Chiu from 32 companies from 2025 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Stephanie Martha Chiu been practicing?
Stephanie Chiu's NPI was assigned in 2023.
What EHR does Stephanie Martha Chiu's practice use?
Dmand AI tracks the EHR system at John Muir Medical Center, Walnut Creek and at 2 more affiliated sites. The vendor and product are available with a free Dmand AI account.
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