Dean Chang, MD
NPI 1770564247 · Gastroenterology Physician · Hamden, CT
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dean Chang, MD is a Gastroenterology Physician provider in Hamden, CT (NPI 1770564247).
Provider details
- NPI number
- 1770564247
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 034043 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
371 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 | 136 | $99 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 54 | $104 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 51 | $165 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 40 | $271 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 37 | $122 |
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 |
|---|---|---|
| Pantoprazole Sodium | 232 | 90 |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 104 | 14 |
| Omeprazole | 92 | 30 |
| Famotidine | 65 | — |
| Lipase/Protease/Amylasebrand: Creon | 58 | — |
| Linaclotidebrand: Linzess | 51 | 16 |
| Cyclobenzaprine Hcl | 46 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,034 across 130 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
- 2005-11-10
- Last updated
- 2021-05-27
- Certified
- 2021-05-27
Frequently asked questions
- What is Dean Chang's NPI number?
- Dean Chang's National Provider Identifier (NPI) is 1770564247, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dean Chang's specialty?
- Dean Chang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Dean Chang located?
- Dean Chang's practice location on file with NPPES is 2200 Whitney Ave, Hamden, CT 06518-3691.
- What is Dean Chang's phone number?
- The practice phone number listed in the NPPES registry for Dean Chang is (203) 281-4463.
- Does Dean Chang accept Medicare?
- Dean Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dean Chang's NPI active?
- Yes — Dean Chang's NPI (1770564247) is active in the NPPES registry as of the last update on 2021-05-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.