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Dr. Douglas Chang, MD
NPI1295766889PAC ID7911901491
- Medicare services, 2024
- 239
- Medicare patients, 2024
- 62
- Part D claims, 2017
- 42
- Publications
- 5
- Hospital affiliations
- 1
- Practice address
- 12601 Garden Grove Blvd, Garden Grove, CA 92843
- Practice phone
- Call (714) 537-5160
- 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
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Dr. Douglas Chang is a neurologist in Garden Grove, California
Dr. Chang practices at Garden Grove Hospital Medical Center in Garden Grove, California, part of Prime Healthcare Services.
Dr. Chang's NPI, 1295766889, was assigned on July 5, 2006. Dr. Chang graduated from David Geffen School of Medicine at UCLA in 1976. Dr. Chang's California license number on file is G63764.
NPI and contact details
- NPI
- 1295766889NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7911901491
- NPI enumeration date
- July 5, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 537-5160
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 76
- Medical school graduation
- 1976
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Douglas Chang practices at Garden Grove Hospital Medical Center in Garden Grove, California
Dr. Chang's primary practice is Garden Grove Hospital Medical Center, at 12601 Garden Grove Blvd, Garden Grove, CA 92843 in Orange County. The practice phone is (714) 537-5160.
- Garden Grove Hospital Medical Center12601 Garden Grove Blvd, Garden Grove, CA 92843 · Orange CountyPhone(714) 537-5160
Source: Dmand AI Affiliation Data
Dr. Douglas Chang is affiliated with 1 site of care
Dr. Chang's primary practice is Garden Grove Hospital Medical Center in Garden Grove, California, part of Prime Healthcare Services. 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. Douglas Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Garden Grove Hospital Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every hospital where Dr. Chang practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across Prime Healthcare Services and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Douglas Chang is one of 2,207 neurologists in California
Neurology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 2084N0400X. Dr. Chang is board certified in internal medicine by the American Board of Internal Medicine. Dr. Chang has a license on file in California.
Specialties and state licenses
- Neurology, CaliforniaPrimary
Neurologists near Dr. Chang
Counts of neurologists with a Dmand AI profile, by place and practice. Each opens the list.
2,207neurologists in California
2neurologists in Garden Grove
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Douglas Chang billed Medicare for 239 services in 2024
CMS data shows 239 Medicare services from Dr. Chang across 4 procedure codes in 2024, for 62 Medicare patients. Medicare paid $17,722 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2024239
Medicare patients62
Paid by Medicare$17,722
Procedure codes4
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2532024: 19423%
- Tests and treatments
- 2023: 762024: 4541%
Dr. Chang compared with the California median for neurologists, 2024
- Dr. Chang
- California median
- Medicare services
- 239vs 40441% below
- Medicare patients
- 62vs 19067% below
- Part D claims
- 42vs 32487% below
Medians across 1,995 neurologists 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 neurologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Douglas Chang treated 62 Medicare patients in 2024, average age 79
CMS counts 62 Medicare patients who saw Dr. Chang in 2024. The largest group is 75 to 84, with 32 patients. 75% of them have chronic kidney disease, and 75% have diabetes. Their average risk score is 4.16, 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 65, with 38% women.
Medicare patients, 202462
Average age79
Average risk score4.16
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
- Women3252%
- Men3048%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- Chronic kidney disease75%
- Diabetes75%
- High blood pressure75%
- High cholesterol75%
- Heart failure68%
- Alzheimer's and dementia65%
- Ischemic heart disease63%
- Arthritis61%
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 65
Patient panel by sex, all payers
- Women38%
- Men62%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Douglas Chang wrote 42 Medicare Part D claims in 2017
In 2017, Dr. Chang wrote 42 Medicare Part D claims. They cover 2 drugs, with $8,709 in total drug cost. In 2016, CMS named 45 claims across 2 drugs.
Part D claims, 201742
Drugs named by CMS2
Total drug cost$8,709
Dr. Chang's most prescribed drugs by claims, 2017
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, 2016 to 2017
- 2016
- 2017
- Claims for drugs CMS names
- 2016: 452017: 427%
Drugs named by CMS: 2 in 2017, 2 in 2016.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. Douglas Chang takes part in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Douglas Chang has 5 publications on record
Dmand AI links 5 papers to Dr. Chang in 2010. Dr. Chang's most frequent co-author is Judi Yamamoto, MD.
Papers5
Dr. Chang's most frequent co-authors
Recent publications by Dr. Chang
Zhonghua Yi Xue Za Zhi (Taipei)
BlepharoptosisCerebral HemorrhageHematoma
Community Ment Health J
AlcoholismCross-Cultural ComparisonEmigration and Immigration
J Korean Med Sci
Encephalitis, ViralPolyradiculoneuropathyRubella
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 neurologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Douglas Chang received $539 in industry payments from 2016 to 2024
CMS Open Payments shows 13 general payments to Dr. Chang from 3 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Allergan Inc. paid the most, $303.
General payments to Dr. Chang by program year, 2016 to 2024
Companies that paid Dr. Chang the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Douglas Chang graduated from David Geffen School of Medicine at UCLA
Dr. Chang graduated from David Geffen School of Medicine at UCLA in 1976.
- Medical school
- Board certified in internal medicine
- Board certified in neurology
Source: Dmand AI Professional Profile Data
Dr. Douglas Chang accepts plans from 5 insurance carriers
Dr. Chang is in network with 5 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 4. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Elevance
Plan types Dr. Chang accepts, by number of carriers
- Medicare4
- PPO4
- HMO2
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Douglas 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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) |
| 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. Douglas 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. Douglas Chang's NPI number?
Dr. Douglas Chang's NPI number is 1295766889. It was assigned on July 5, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Douglas Chang?
Dr. Douglas Chang is a neurologist in Garden Grove, California. The primary specialty in the NPI Registry is Neurology Physician (taxonomy code 2084N0400X).
Where does Dr. Douglas Chang practice?
Dr. Chang practices at 12601 Garden Grove Blvd, Garden Grove, CA 92843. Dr. Chang's primary practice is Garden Grove Hospital Medical Center in Garden Grove, California, part of Prime Healthcare Services.
What is Dr. Douglas Chang's office phone number?
The practice phone on file for Dr. Chang is (714) 537-5160.
What is Dr. Douglas Chang's medical license number?
Dr. Chang's California license number on file is G63764.
Which hospitals is Dr. Douglas Chang affiliated with?
Dr. Chang practices at Garden Grove Hospital Medical Center in Garden Grove, California.
Does Dr. Douglas Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 239 services in 2024, and Dr. Chang accepts Medicare assignment.
How many Medicare patients does Dr. Douglas Chang see?
CMS counts 62 Medicare patients who saw Dr. Chang in 2024, with an average age of 79.
Is Dr. Douglas Chang board certified?
Yes. Dr. Chang is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Douglas Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99222) and nerve and brain test (95816).
Show 7 more questionsShow fewer questions
Where did Dr. Douglas Chang go to medical school?
Dr. Chang graduated from David Geffen School of Medicine at UCLA in 1976.
What drugs does Dr. Douglas Chang prescribe most?
In 2017 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Vimpat and Levetiracetam.
Has Dr. Douglas Chang received payments from drug or device companies?
CMS Open Payments shows $539 in general payments to Dr. Chang from 3 companies from 2016 to 2024. The largest total came from Allergan Inc.
How long has Dr. Douglas Chang been practicing?
Dr. Chang graduated from medical school in 1976, 50 years ago.
Does Dr. Douglas Chang do research?
Dmand AI links 5 publications to Dr. Chang.
Who does Dr. Douglas Chang publish with?
Dr. Chang's most frequent co-authors are Judi Yamamoto, MD (1 shared paper).
What insurance does Dr. Douglas Chang accept?
Dr. Chang is in network with 5 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 4. Check the plan with the practice before a visit.
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