Alan Chang, MD
NPI 1912992330 · Gastroenterology Physician · Doylestown, PA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alan Chang, MD is a Gastroenterology Physician provider in Doylestown, PA (NPI 1912992330).
Provider details
- NPI number
- 1912992330
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD071986L (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,256 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 251 | $93 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 160 | $110 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 142 | $255 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 126 | $131 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 99 | $98 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 342 | 102 |
| Pantoprazole Sodium | 166 | 59 |
| Famotidine | 153 | 50 |
| Sod Sulf/Pot Chloride/Mag Sulfbrand: Sutab | 99 | 98 |
| Linaclotidebrand: Linzess | 46 | 12 |
| Sucralfate | 37 | 13 |
| Mesalamine | 37 | 11 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,365 across 139 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-12
- Last updated
- 2020-02-28
- Certified
- 2020-02-28
Frequently asked questions
- What is Alan Chang's NPI number?
- Alan Chang's National Provider Identifier (NPI) is 1912992330, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alan Chang's specialty?
- Alan Chang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Alan Chang located?
- Alan Chang's practice location on file with NPPES is 599 W State St, Doylestown, PA 18901-2567.
- What is Alan Chang's phone number?
- The practice phone number listed in the NPPES registry for Alan Chang is (215) 345-6050.
- Does Alan Chang accept Medicare?
- Alan Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alan Chang's NPI active?
- Yes — Alan Chang's NPI (1912992330) is active in the NPPES registry as of the last update on 2020-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.