Dr. Alan W. Chang, MD
- Medicare services, 2024
- 1,256
- Medicare patients, 2024
- 673
- Part D claims, 2024
- 1,319
- Hospital affiliations
- 1
- Industry payments
- $16,651
- Practice address
- 595 W State St, Doylestown, PA 18901
- Practice phone
- Call (215) 345-2321
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Penn Medicine Doylestown Health
Doylestown, Pennsylvania
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. Alan W. Chang is a gastroenterologist in Doylestown, Pennsylvania
Dr. Chang practices at Penn Medicine Doylestown Health in Doylestown, Pennsylvania.
Dr. Chang's NPI, 1912992330, was assigned on September 12, 2005. Dr. Chang graduated from Perelman School of Medicine - Philadelphia in 1998. Dr. Chang holds Pennsylvania license MD071986L.
- NPI
- 1912992330NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6709874118
- NPI enumeration date
- September 12, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (215) 345-2321
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Alan W. Chang practices at Penn Medicine Doylestown Health in Doylestown, Pennsylvania
Dr. Chang's primary practice is Penn Medicine Doylestown Health, at 595 W State St, Doylestown, PA 18901 in Bucks County. The practice phone is (215) 345-2321.
- Penn Medicine Doylestown Health595 W State St, Doylestown, PA 18901 · Bucks CountyPhone(215) 345-2321
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Alan W. Chang is affiliated with 4 sites of care and 2 medical groups
Dr. Chang's primary practice is Penn Medicine Doylestown Health in Doylestown, Pennsylvania. Dr. Chang is also affiliated with Doylestown Hospital. The medical group on file is Clinical Specialty Associates. 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. Alan W. 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 |
|---|---|
| Penn Medicine Doylestown Health | 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. Alan W. Chang is one of 899 gastroenterologists in Pennsylvania
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 is licensed in Pennsylvania.
Specialties and state licenses
- Gastroenterology, PennsylvaniaPrimary
Clinical focus
Dmand AI lists acid reflux, chronic inflammatory bowel disease (IBD), cirrhosis of the liver, colonoscopy, fatty liver, gastroenteritis, gastrointestinal bleeding and hemorrhoids among the conditions Dr. Chang treats.
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. Alan W. Chang billed Medicare for 1,256 services in 2024
CMS data shows 1,256 Medicare services from Dr. Chang across 15 procedure codes in 2024, for 673 Medicare patients. Medicare paid $118,706 for them.
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7622024: 7018%
- Surgery
- 2023: 4032024: 4307%
- Other services
- 2023: 462024: 125172%
Where Dr. Chang's Medicare services took place, 2024
- In an office57346%
- In a facility68354%
Dr. Chang compared with the Pennsylvania median for gastroenterologists, 2024
- Dr. Chang
- Pennsylvania median
- Medicare services
- 1,256vs 4013.1 times
- Medicare patients
- 673vs 2942.3 times
- Part D claims
- 1,134vs 3753.0 times
Medians across 899 gastroenterologists in Pennsylvania 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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other gastroenterologists in Pennsylvania.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Alan W. Chang treated 673 Medicare patients in 2024, average age 74
CMS counts 673 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 350 patients. 75% of them have high cholesterol, and 72% have high blood pressure. 4% are also on Medicaid. Their average risk score is 1.39, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 73, with 52% women.
Dr. Chang's Medicare patients by age, 2024
Dr. Chang's Medicare patients by sex, 2024
- Women34151%
- Men33249%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High cholesterol75%
- High blood pressure72%
- Arthritis48%
- Anxiety31%
- Mood disorders27%
- Ischemic heart disease26%
- Depression25%
- Atrial fibrillation24%
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 73
Patient panel by sex, all payers
- Women52%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Alan W. Chang wrote 1,319 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 1,319 Medicare Part D claims for 429 patients. 79% of them were for generic drugs. CMS names the drug for 1,134 of them, across 22 drugs with 11 or more claims each, at $752,256 in total drug cost. In 2023, CMS named 1,116 claims across 25 drugs.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic1,039 claims79%
- Brand-name280 claims21%
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
- Antibiotics2%30 of 1,319 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: 1,1162024: 1,1342%
Drugs named by CMS: 22 in 2024, 25 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. Alan W. Chang ranks in the 97th percentile for colonoscopy in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chang as offering telehealth. CMS counts 273 procedures of colonoscopy by Dr. Chang, more than 97% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Chang ranks in Medicare procedure volume
- Colonoscopy
- 97th percentile273 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 90th percentile198 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. Alan W. Chang received $16,651 in industry payments from 2016 to 2025
CMS Open Payments shows 945 general payments to Dr. Chang from 55 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $3,434.
General payments to Dr. Chang by program year, 2016 to 2025
General payments to Dr. Chang by kind, 2016 to 2025
- Food and beverage$16,46599%
- Education$1741%
- Consulting fees$130%
Companies that paid Dr. Chang the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Alan W. Chang has 1 award and honors on record
Dmand AI lists 1 award for Dr. Chang, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Chang
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Alan W. Chang graduated from Perelman School of Medicine - Philadelphia
Dr. Chang graduated from Perelman School of Medicine - Philadelphia in 1998.
- Medical school
- Board certified in gastroenterology
Source: Dmand AI Professional Profile Data
Dr. Alan W. Chang accepts plans from 20 insurance carriers
Dr. Chang is in network with 20 carriers, including Aetna, Elevance and HCSC. PPO plans come from the most carriers, 13. Check the plan with the practice before a visit.
- Aetna
- Elevance
- HCSC
- Highmark
- United Healthcare
- Cigna
- Horizon Blue Cross Blue Shield of New Jersey
- Aspirus Health Plan
- +12 more carriersWith a free account
Plan types Dr. Chang accepts, by number of carriers
- PPO13
- Medicare12
- HMO11
- EPO5
- POS5
Source: Dmand AI Insurance Network Data
Sources for Dr. Alan W. 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 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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Alan W. 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. Alan W. Chang's NPI number?
Dr. Alan W. Chang's NPI number is 1912992330. It was assigned on September 12, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Alan W. Chang?
Dr. Alan W. Chang is a gastroenterologist in Doylestown, Pennsylvania. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Alan W. Chang practice?
Dr. Chang practices at 595 W State St, Doylestown, PA 18901. Dr. Chang's primary practice is Penn Medicine Doylestown Health in Doylestown, Pennsylvania. Dmand AI also links Dr. Chang to 2 group practices and clinics and 1 medical group.
What is Dr. Alan W. Chang's office phone number?
The practice phone on file for Dr. Chang is (215) 345-2321.
What is Dr. Alan W. Chang's medical license number?
Dr. Chang holds Pennsylvania license MD071986L.
Which hospitals is Dr. Alan W. Chang affiliated with?
Dr. Chang is affiliated with Doylestown Hospital.
What medical group is Dr. Alan W. Chang part of?
Dr. Chang is linked to Clinical Specialty Associates. Dmand AI links Dr. Chang to 1 more medical group.
Does Dr. Alan W. Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 1,256 services in 2024, and Dr. Chang accepts Medicare assignment.
Does Dr. Alan W. Chang offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chang as offering telehealth services.
How many Medicare patients does Dr. Alan W. Chang see?
CMS counts 673 Medicare patients who saw Dr. Chang in 2024, with an average age of 74.
Show 7 more questionsShow fewer questions
Is Dr. Alan W. Chang board certified?
Yes. Dr. Chang is board certified in gastroenterology by the American Board of Internal Medicine.
What services does Dr. Alan W. Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were office visit, established patient (99213), surgery: digestive system (45380) and surgery: digestive system (45385).
Where did Dr. Alan W. Chang go to medical school?
Dr. Chang graduated from Perelman School of Medicine - Philadelphia in 1998.
What drugs does Dr. Alan W. Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Omeprazole, Pantoprazole Sodium and Famotidine.
Has Dr. Alan W. Chang received payments from drug or device companies?
CMS Open Payments shows $16,651 in general payments to Dr. Chang from 55 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Alan W. Chang been practicing?
Dr. Chang graduated from medical school in 1998, 28 years ago.
What insurance does Dr. Alan W. Chang accept?
Dr. Chang is in network with 20 carriers, including Aetna, Elevance and HCSC. PPO plans come from the most carriers, 13. Check the plan with the practice before a visit.
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