Dr. Jinnie Chang, MD
- Medicare services, 2024
- 232
- Medicare patients, 2024
- 70
- Part D claims, 2024
- 289
- Publications
- 2
- MIPS score, 2024
- 82
- Practice address
- 2500 Alhambra Avenue, Martinez, CA 94553
- Practice phone
- Call (925) 370-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. 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.
Dr. Jinnie Chang is a family medicine physician in Martinez, California
Dr. Chang practices at Contra Costa Regional Medical Center in Martinez, California, part of State of California.
Dr. Chang's NPI, 1316507643, was assigned on June 18, 2019. Dr. Chang holds California license A181910.
- NPI
- 1316507643NPI Registry (opens in a new tab)
- NPI enumeration date
- June 18, 2019
- NPI status
- Active
- Practice phone
- (925) 370-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Jinnie Chang practices at Contra Costa Regional Medical Center in Martinez, California
Dr. Chang's primary practice is Contra Costa Regional Medical Center, at 2500 Alhambra Avenue, Martinez, CA 94553 in Contra Costa County. The practice phone is (925) 370-5000.
- Contra Costa Regional Medical Center2500 Alhambra Avenue, Martinez, CA 94553 · Contra Costa CountyPhone(925) 370-5000
Source: Dmand AI Affiliation Data
Dr. Jinnie Chang is affiliated with 3 sites of care and 3 medical groups
Dr. Chang's primary practice is Contra Costa Regional Medical Center in Martinez, California, part of State of California. Dr. Chang is also affiliated with San Joaquin General Hospital. The medical group on file is West County Adult Mental Health Services. Dmand AI also links Dr. Chang to 2 more medical groups and 1 community health center, each named with a free account. Dr. Chang's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jinnie Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Contra Costa Regional Medical Center | Available with a free account |
| +2 more sites and 2 medical groups | 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 State of California and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Jinnie Chang is one of 15,680 family medicine physicians in California
Family medicine is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Chang is licensed in California.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
Family medicine physicians near Dr. Chang
Counts of family medicine physicians 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
Dr. Jinnie Chang billed Medicare for 232 services in 2024
CMS data shows 232 Medicare services from Dr. Chang across 5 procedure codes in 2024, for 70 Medicare patients. Medicare paid $18,252 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2722024: 23215%
Dr. Chang compared with the California median for family medicine physicians, 2024
- Dr. Chang
- California median
- Medicare services
- 232vs 2466% below
- Medicare patients
- 70vs 11841% below
- Part D claims
- 144vs 83383% below
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Chang's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Chang?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other family medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jinnie Chang treated 70 Medicare patients in 2024, average age 72
CMS counts 70 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 29 patients. 75% of them have high blood pressure, and 73% have high cholesterol. Their average risk score is 1.94, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 71, with 52% women.
Dr. Chang's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Chang's Medicare patients by sex, 2024
- Women3854%
- Men3246%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High blood pressure75%
- High cholesterol73%
- Diabetes61%
- Chronic kidney disease43%
- Heart failure40%
- Ischemic heart disease34%
- Atrial fibrillation33%
- Mood disorders27%
Share of Medicare patients with each condition. A patient can have several.
Dr. 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 71
Patient panel by sex, all payers
- Women52%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jinnie Chang wrote 289 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 289 Medicare Part D claims for 54 patients. 89% of them were for generic drugs. CMS names the drug for 144 of them, across 7 drugs with 11 or more claims each, at $1,632 in total drug cost. In 2023, CMS named 11 claims across 1 drug.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic257 claims89%
- Brand-name32 claims11%
Dr. Chang's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 112024: 1441209%
Drugs named by CMS: 7 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Jinnie Chang scored 82 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 82 out of 100 for Dr. Chang for performance year 2024, reported as part of a group.
Dr. Chang's MIPS scores, performance year 2024
- 82of 100Final score
- 71.6of 100Quality
- 40of 100Improvement Activities
- 58of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Jinnie Chang has 2 publications on record
Dmand AI links 2 papers to Dr. Chang in 2016. Dr. Chang's most frequent co-authors are David James Malinak, MD, Sunny Dawn Smith, MD and Kristin Joy Ament Brownell, MD.
Dr. Chang's most frequent co-authors
- David James Malinak, MD2 shared papers
- Sunny Dawn Smith, MD2 shared papers
- Kristin Joy Ament Brownell, MD1 shared paper
Recent publications by Dr. Chang
See who Dr. Chang researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chang works with, so you can find a warm path to the right family medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Jinnie Chang received $20 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Chang from 1 drug or device company in 2025. Education make up the largest share, 100% of the total. Gilead Sciences, Inc. paid the most, $20.
Companies that paid Dr. Chang 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 Dr. Jinnie 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 services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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 and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 Dr. Jinnie 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 Dr. Jinnie Chang's NPI number?
Dr. Jinnie Chang's NPI number is 1316507643. It was assigned on June 18, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Jinnie Chang?
Dr. Jinnie Chang is a family medicine physician in Martinez, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Jinnie Chang practice?
Dr. Chang practices at 2500 Alhambra Avenue, Martinez, CA 94553. Dr. Chang's primary practice is Contra Costa Regional Medical Center in Martinez, California, part of State of California. Dmand AI also links Dr. Chang to 2 medical groups and 1 community health center.
What is Dr. Jinnie Chang's office phone number?
The practice phone on file for Dr. Chang is (925) 370-5000.
What is Dr. Jinnie Chang's medical license number?
Dr. Chang holds California license A181910.
Which hospitals is Dr. Jinnie Chang affiliated with?
Dr. Chang practices at Contra Costa Regional Medical Center in Martinez, California. Dr. Chang is also affiliated with San Joaquin General Hospital.
What medical group is Dr. Jinnie Chang part of?
Dr. Chang is linked to West County Adult Mental Health Services. Dmand AI links Dr. Chang to 2 more medical groups.
Does Dr. Jinnie Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 232 services in 2024.
What is Dr. Jinnie Chang's MIPS score?
Dr. Chang's MIPS final score for performance year 2024 is 82 out of 100, reported as part of a group.
How many Medicare patients does Dr. Jinnie Chang see?
CMS counts 70 Medicare patients who saw Dr. Chang in 2024, with an average age of 72.
Show 6 more questionsShow fewer questions
What services does Dr. Jinnie Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99222).
What drugs does Dr. Jinnie Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Pantoprazole Sodium.
Has Dr. Jinnie Chang received payments from drug or device companies?
CMS Open Payments shows $20 in general payments to Dr. Chang from 1 company from 2025 to 2025. The largest total came from Gilead Sciences, Inc.
How long has Dr. Jinnie Chang been practicing?
Dr. Chang graduated from medical school in 2019, 7 years ago.
Does Dr. Jinnie Chang do research?
Dmand AI links 2 publications to Dr. Chang.
Who does Dr. Jinnie Chang publish with?
Dr. Chang's most frequent co-authors are David James Malinak, MD (2 shared papers), Sunny Dawn Smith, MD (2 shared papers) and Kristin Joy Ament Brownell, MD (1 shared paper).
Selling to family medicine practices?
See family medicine physicians in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card