Alan W. Chang, MD
Gastroenterology Physician · Doylestown, PA
Alan W. Chang, MD is a gastroenterology physician with a practice address in Doylestown, Pennsylvania, and NPI 1912992330, issued on Sep 12, 2005. Check the license (Pennsylvania MD071986L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Alan W. Chang
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- MD071986L PA
Self-reported in NPPES; status is on the state search - Practice location
- 599 W State St, Doylestown, PA 18901
- Phone
- (215) 345-6050
- Enumerated
- Sep 12, 2005
- Record last updated
- Feb 28, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (215) 345-6568
- Medicare enrollment
- Enrolled (PECOS I20040504001343); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 1,049 in Pennsylvania → Look up another NPI →
Also registered at 599 W State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Alan W. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD071986LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
63% more Medicare Part D claims than the average gastroenterology physician in 2024
1,319 Medicare Part D claims for 429 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Omeprazole342 claims
- Pantoprazole Sodium166 claims
- Famotidine153 claims
- Sutab99 claims
- Linzess46 claims
- Mesalamine37 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $3,364.89
139 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Clinical Specialty AssociatesDoylestown, PA
- Via AffiliatesDoylestown, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alan W. Chang among 1,049 gastroenterology physician records in Pennsylvania
Alan W. Chang, MD is one of 1,049 gastroenterology physician records with a practice address in Pennsylvania. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1998 · median 2003 among the 769 with a school on file
- Record last updated2020 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Pennsylvania
There are 1,049 gastroenterology physician records in Pennsylvania.
All 1,049 in Pennsylvania → Every provider in Doylestown → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Nasir AkhtarDoylestown, PA 189011376816504
- James Bohning, MDDoylestown, PA 189011497927776
- Hannah Do, M.D.Doylestown, PA 189011770808990
- Robert Hale, M.D.Doylestown, PA 189011992704431
- Mayurathan Kesavan, M.DDoylestown, PA 189011851687958
- Jyothi Mekapati, MDDoylestown, PA 189011235305269
- Louis Morsbach, M.D.Doylestown, PA 189011326032970
- Marion-Anna Protano, M.D.Doylestown, PA 189011972745875
Common questions
What is Alan W. Chang, MD's NPI number?
Alan W. Chang, MD's National Provider Identifier (NPI) is 1912992330, issued on Sep 12, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Alan W. Chang, MD located?
The NPPES record lists a practice address at 599 W State St, Doylestown, PA, 18901. Phone: (215) 345-6050. Providers update this record themselves, so call before visiting.
How can I verify Alan W. Chang, MD's license?
NPPES lists Pennsylvania license number MD071986L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alan W. Chang, MD prescribe under Medicare Part D?
In 2024, Alan W. Chang, MD had 1,319 Medicare Part D claims for 429 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.