Katherine Chang, NP
- Hospital affiliations
- 2
- Industry payments
- $329
- State license
- 1
- Year NPI issued
- 2023
- 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 Katherine Chang'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.
Katherine Chang is a nurse practitioner in Walnut Creek, California
Katherine Chang practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health.
Katherine Chang's NPI, 1679357248, was assigned on August 23, 2023. Katherine Chang holds California license 95010900.
- NPI
- 1679357248NPI Registry (opens in a new tab)
- NPI enumeration date
- August 23, 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
Katherine Chang practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California
Katherine Chang'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
Katherine Chang is affiliated with 2 sites of care
Katherine Chang's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dmand AI also links Katherine Chang to 1 hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Katherine Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Katherine Chang practices, 2 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 |
| +1 more affiliated site | 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.
Katherine Chang is one of 5,983 nurse practitioners in California
Nurse practitioner is Katherine Chang's primary specialty in the NPI Registry, under taxonomy code 363L00000X. Katherine Chang is licensed in California.
Specialties and state licenses
- Nurse practitioner, CaliforniaPrimary
Nurse practitioners near Katherine Chang
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
Katherine Chang's patients have a median age of 60
Across all payers, Dmand AI patient panel data puts Katherine Chang's median patient age at 60, with 98% women.
Katherine Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women98%
- Men0%
Source: Dmand AI Patient Panel Data
Katherine Chang received $329 in industry payments from 2024 to 2025
CMS Open Payments shows 10 general payments to Katherine Chang from 5 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Boehringer Ingelheim Pharmaceuticals, Inc. paid the most, $125.
General payments to Katherine Chang by program year, 2024 to 2025
Companies that paid Katherine Chang the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Katherine Chang'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 |
| 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 Katherine Chang
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Katherine Chang's NPI number?
Katherine Chang's NPI number is 1679357248. It was assigned on August 23, 2023, and it is active in the NPI Registry.
What does Katherine Chang specialize in?
Katherine Chang is a nurse practitioner in Walnut Creek, California. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does Katherine Chang practice?
Katherine Chang practices at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598. Katherine Chang's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dmand AI also links Katherine Chang to 1 hospital.
What is Katherine Chang's office phone number?
The practice phone on file for Katherine Chang is (925) 939-3000.
What is Katherine Chang's medical license number?
Katherine Chang holds California license 95010900.
Which hospitals is Katherine Chang affiliated with?
Katherine Chang practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California. Dmand AI links Katherine Chang to 1 more hospital.
Has Katherine Chang received payments from drug or device companies?
CMS Open Payments shows $329 in general payments to Katherine Chang from 5 companies from 2024 to 2025. The largest total came from Boehringer Ingelheim Pharmaceuticals, Inc.
How long has Katherine Chang been practicing?
Katherine Chang's NPI was assigned in 2023.
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