Dr. Christine H. Chang, MD
- Medicare services, 2024
- 787
- Medicare patients, 2024
- 569
- Part D claims, 2024
- 320
- MIPS score, 2024
- 97
- Hospital affiliations
- 2
- Practice address
- 1600 N Rose Ave, Oxnard, CA 93030
- Practice phone
- Call (805) 988-2500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Chang's professional email, personal email and mobile number
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Dr. Christine H. Chang is an emergency medicine physician in Oxnard, California
Dr. Chang practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health.
Dr. Chang's NPI, 1003132671, was assigned on April 8, 2010. Dr. Chang graduated from University of Toledo College of Medicine and Life Sciences in 2010. Dr. Chang's California license number on file is A151725.
- NPI
- 1003132671NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0648413930
- NPI enumeration date
- April 8, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (805) 988-2500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 42
- Medical school graduation
- 2010
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Christine H. Chang practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California
Dr. Chang's primary practice is Dignity Health - St. John's Regional Medical Center, at 1600 N Rose Ave, Oxnard, CA 93030 in Ventura County. The practice phone is (805) 988-2500.
- Dignity Health - St. John's Regional Medical Center1600 N Rose Ave, Oxnard, CA 93030 · Ventura CountyPhone(805) 988-2500
Source: Dmand AI Affiliation Data
Dr. Christine H. Chang is affiliated with 2 sites of care and 2 medical groups
Dr. Chang's primary practice is Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health. The medical group on file is Vituity. Dmand AI also links Dr. Chang to 1 more hospital 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 Dr. Christine H. Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dignity Health - St. John's Regional Medical Center | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Christine H. Chang is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Chang is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Chang's licenses on file in 3 states: California, Ohio and New York.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- Ohio license
- New York license
Emergency medicine physicians near Dr. Chang
Counts of emergency 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. Christine H. Chang billed Medicare for 787 services in 2024
CMS data shows 787 Medicare services from Dr. Chang across 4 procedure codes in 2024, for 569 Medicare patients. Medicare paid $76,845 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: 5852024: 5771%
- Tests and treatments
- 2023: 2832024: 21026%
Dr. Chang compared with the California median for emergency medicine physicians, 2024
- Dr. Chang
- California median
- Medicare services
- 787vs 2653.0 times
- Medicare patients
- 569vs 2432.3 times
- Part D claims
- 183vs 623.0 times
Medians across 7,079 emergency 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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Christine H. Chang treated 569 Medicare patients in 2024, average age 75
CMS counts 569 Medicare patients who saw Dr. Chang in 2024. The largest group is 75 to 84, with 195 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 39% are also on Medicaid. Their average risk score is 2.21, 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 40, with 55% women.
Dr. Chang's Medicare patients by age, 2024
Dr. Chang's Medicare patients by sex, 2024
- Women33859%
- Men23141%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis54%
- Ischemic heart disease45%
- Diabetes41%
- Anxiety38%
- Mood disorders38%
- Chronic kidney disease37%
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 40
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Christine H. Chang wrote 320 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 320 Medicare Part D claims for 252 patients. 94% of them were for generic drugs. CMS names the drug for 183 of them, across 8 drugs with 11 or more claims each, at $814 in total drug cost. In 2023, CMS named 165 claims across 7 drugs.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic302 claims94%
- Brand-name and other18 claims6%
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.
Drug classes CMS tracks in Dr. Chang's Part D claims, 2024
- Opioids14%45 of 320 claims
- Antibiotics31%100 of 320 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1652024: 18311%
Drugs named by CMS: 8 in 2024, 7 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. Christine H. Chang scored 97 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 97 out of 100 for Dr. Chang for performance year 2024, reported as part of a group. Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Chang's MIPS scores, performance year 2024
- 97of 100Final score
- 90of 100Quality
- 40of 100Improvement Activities
- 78of 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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Dr. Christine H. Chang received $429 in industry payments from 2019 to 2025
CMS Open Payments shows 12 general payments to Dr. Chang from 4 drug and device companies from 2019 to 2025. Food and beverage make up the largest share, 100% of the total. Abiomed paid the most, $144.
General payments to Dr. Chang by program year, 2019 to 2025
Companies that paid Dr. Chang the most, 2019 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Christine H. Chang graduated from University of Toledo College of Medicine and Life Sciences
Dr. Chang graduated from University of Toledo College of Medicine and Life Sciences in 2010.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Christine H. Chang accepts plans from 8 insurance carriers
Dr. Chang is in network with 8 carriers, including United Healthcare, Aspirus Health Plan and Blue Cross and Blue Shield of Kansas City. PPO plans come from the most carriers, 3. Check the plan with the practice before a visit.
- United Healthcare
- Aspirus Health Plan
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
- Elevance
- GA State Medicaid
- HCSC
- RI State Medicaid
Plan types Dr. Chang accepts, by number of carriers
- PPO3
- Medicaid2
- Medicare2
- POS2
- EPO1
- HMO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Christine H. 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 | 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 |
| Insurance carriers and plan types | Dmand AI Insurance Network 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 Dr. Christine H. 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. Christine H. Chang's NPI number?
Dr. Christine H. Chang's NPI number is 1003132671. It was assigned on April 8, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Christine H. Chang?
Dr. Christine H. Chang is an emergency medicine physician in Oxnard, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Christine H. Chang practice?
Dr. Chang practices at 1600 N Rose Ave, Oxnard, CA 93030. Dr. Chang's primary practice is Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health. Dmand AI also links Dr. Chang to 1 hospital and 1 medical group.
What is Dr. Christine H. Chang's office phone number?
The practice phone on file for Dr. Chang is (805) 988-2500.
What is Dr. Christine H. Chang's medical license number?
Dr. Chang's California license number on file is A151725, one of the licenses on file in 3 states.
Which states has Dr. Christine H. Chang been licensed in?
Dmand AI has state licenses on file for Dr. Chang in California (2017 to 2025), Ohio (2010 to 2018) and New York (2013 to 2015).
Which hospitals is Dr. Christine H. Chang affiliated with?
Dr. Chang practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California. Dmand AI links Dr. Chang to 1 more hospital.
What medical group is Dr. Christine H. Chang part of?
Dr. Chang is linked to Vituity. Dmand AI links Dr. Chang to 1 more medical group.
Does Dr. Christine H. Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 787 services in 2024, and Dr. Chang accepts Medicare assignment.
What is Dr. Christine H. Chang's MIPS score?
Dr. Chang's MIPS final score for performance year 2024 is 97 out of 100, reported as part of a group.
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. Christine H. Chang see?
CMS counts 569 Medicare patients who saw Dr. Chang in 2024, with an average age of 75.
Is Dr. Christine H. Chang board certified?
Yes. Dr. Chang is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Christine H. Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and emergency department visit (99284).
Where did Dr. Christine H. Chang go to medical school?
Dr. Chang graduated from University of Toledo College of Medicine and Life Sciences in 2010.
What drugs does Dr. Christine H. Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Cephalexin, Hydrocodone-Acetaminophen and Ondansetron ODT.
Has Dr. Christine H. Chang received payments from drug or device companies?
CMS Open Payments shows $429 in general payments to Dr. Chang from 4 companies from 2019 to 2025. The largest total came from Abiomed.
How long has Dr. Christine H. Chang been practicing?
Dr. Chang graduated from medical school in 2010, 16 years ago.
What insurance does Dr. Christine H. Chang accept?
Dr. Chang is in network with 8 carriers, including United Healthcare, Aspirus Health Plan and Blue Cross and Blue Shield of Kansas City. PPO plans come from the most carriers, 3. Check the plan with the practice before a visit.
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