Dr. Patrick Chang, MD
- Medicare patients, 2024
- 11
- Part D claims, 2024
- 71
- Publications
- 9
- Hospital affiliations
- 1
- Industry payments
- $4,116
- Practice address
- 3366 5th Ave, San Diego, CA 92103
- Practice phone
- Call (760) 436-4558
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Genesis Healthcare Partners
San Diego, California
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. Patrick Chang is a gastroenterologist in San Diego, California
Dr. Chang practices at Genesis Healthcare Partners in San Diego, California.
Dr. Chang's NPI, 1750885307, was assigned on March 20, 2018. Dr. Chang graduated from Tulane School of Medicine in 2018. Dr. Chang's California license number on file is A164305.
- NPI
- 1750885307NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5698106250
- NPI enumeration date
- March 20, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (760) 436-4558
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Patrick Chang practices at Genesis Healthcare Partners in San Diego, California
Dr. Chang's primary practice is Genesis Healthcare Partners, at 3366 5th Ave, San Diego, CA 92103 in San Diego County. The practice phone is (760) 436-4558.
- Genesis Healthcare Partners3366 5th Ave, San Diego, CA 92103 · San Diego CountyPhone(760) 436-4558
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Patrick Chang is affiliated with 4 sites of care and 2 medical groups
Dr. Chang's primary practice is Genesis Healthcare Partners in San Diego, California. Dr. Chang is also affiliated with Huntington Hospital. The medical group on file is USC Care Medical Group. Dmand AI also links Dr. Chang to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Patrick 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 |
|---|---|
| Genesis Healthcare Partners | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Patrick Chang is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Chang is board certified in gastroenterology by the American Board of Internal Medicine. Dr. Chang has a license on file in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Chang
Counts of gastroenterologists 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. Patrick Chang treated 11 Medicare patients in 2024, average age 65
CMS counts 11 Medicare patients who saw Dr. Chang in 2024. Their average risk score is 4.69, 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 50% women.
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
- Women50%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Patrick Chang wrote 71 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 71 Medicare Part D claims for 26 patients. 73% of them were for generic drugs. CMS names the drug for 27 of them, across 2 drugs with 11 or more claims each, at $21,332 in total drug cost. In 2022, CMS named 37 claims across 3 drugs.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic52 claims73%
- Brand-name19 claims27%
Dr. Chang's most prescribed drugs by claims, 2023
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
- Antibiotics20%14 of 71 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, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 372023: 2727%
Drugs named by CMS: 2 in 2023, 3 in 2022.
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. Patrick Chang ranks in the 87th percentile for upper gastrointestinal (gi) endoscopy for acid reflux in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 169 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Chang, more than 87% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Chang ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 87th percentile169 procedures
- Colonoscopy
- 79th percentile98 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Patrick Chang has 9 publications on record
Dmand AI links 9 papers to Dr. Chang, published from 2012 to 2023. The most frequent topics are Antiviral Agents. Dr. Chang's most frequent co-authors are Leeyen Hsu, Thatcher Thi Huynh, DO and Myron John Tong, MD.
Dr. Chang's papers by year, 2012 to 2023
Topics Dr. Chang writes about most
- Antiviral Agents
Dr. Chang's most frequent co-authors
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 gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Patrick Chang received $4,116 in industry payments from 2021 to 2025
CMS Open Payments shows 39 general payments to Dr. Chang from 11 drug and device companies from 2021 to 2025. Travel and lodging make up the largest share, 52% of the total. Boston Scientific Corporation paid the most, $3,085.
General payments to Dr. Chang by program year, 2021 to 2025
General payments to Dr. Chang by kind, 2021 to 2025
- Travel and lodging$2,14452%
- Food and beverage$1,97248%
Companies that paid Dr. Chang the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Patrick Chang graduated from Tulane School of Medicine
Dr. Chang graduated from Tulane School of Medicine in 2018.
- Medical school
- Board certified in gastroenterology
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Patrick Chang accepts plans from 6 insurance carriers
Dr. Chang is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- CMS Medicare
Plan types Dr. Chang accepts, by number of carriers
- Medicare6
- PPO5
- HMO2
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Patrick 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| 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)Doctors and Clinicians Utilization Data (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. Patrick 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. Patrick Chang's NPI number?
Dr. Patrick Chang's NPI number is 1750885307. It was assigned on March 20, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Patrick Chang?
Dr. Patrick Chang is a gastroenterologist in San Diego, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Patrick Chang practice?
Dr. Chang practices at 3366 5th Ave, San Diego, CA 92103. Dr. Chang's primary practice is Genesis Healthcare Partners in San Diego, California. Dmand AI also links Dr. Chang to 2 group practices and clinics and 1 medical group.
What is Dr. Patrick Chang's office phone number?
The practice phone on file for Dr. Chang is (760) 436-4558.
What is Dr. Patrick Chang's medical license number?
Dr. Chang's California license number on file is A164305.
Which hospitals is Dr. Patrick Chang affiliated with?
Dr. Chang is affiliated with Huntington Hospital.
What medical group is Dr. Patrick Chang part of?
Dr. Chang is linked to USC Care Medical Group. Dmand AI links Dr. Chang to 1 more medical group.
Does Dr. Patrick Chang accept Medicare?
Yes. CMS lists Dr. Chang as accepting Medicare assignment.
How many Medicare patients does Dr. Patrick Chang see?
CMS counts 11 Medicare patients who saw Dr. Chang in 2024, with an average age of 65.
Is Dr. Patrick Chang board certified?
Yes. Dr. Chang is board certified in gastroenterology by the American Board of Internal Medicine.
Show 7 more questionsShow fewer questions
Where did Dr. Patrick Chang go to medical school?
Dr. Chang graduated from Tulane School of Medicine in 2018.
What drugs does Dr. Patrick Chang prescribe most?
In 2023 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Vemlidy and Pantoprazole Sodium.
Has Dr. Patrick Chang received payments from drug or device companies?
CMS Open Payments shows $4,116 in general payments to Dr. Chang from 11 companies from 2021 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. Patrick Chang been practicing?
Dr. Chang graduated from medical school in 2018, 8 years ago.
Does Dr. Patrick Chang do research?
Dmand AI links 9 publications to Dr. Chang, published from 2012 to 2023.
Who does Dr. Patrick Chang publish with?
Dr. Chang's most frequent co-authors are Leeyen Hsu (2 shared papers), Thatcher Thi Huynh, DO (2 shared papers) and Myron John Tong, MD (2 shared papers).
What insurance does Dr. Patrick Chang accept?
Dr. Chang is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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