Jack Chang, MD
NPI 1811182041 · Internal Medicine Physician · Lowell, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jack Chang, MD is a Internal Medicine Physician provider in Lowell, MA (NPI 1811182041).
Provider details
- NPI number
- 1811182041
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 74694 (MA)
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
18 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
451 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 149 | $140 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 81 | $99 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 67 | $141 |
| Advance Care Planning, First 30 Minutes99497 | 66 | $59 |
| Administration of Influenza Virus VaccineG0008 | 30 | $35 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 100 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 609 | 174 |
| Lisinopril | 295 | 91 |
| Amlodipine Besylate | 271 | 71 |
| Atorvastatin Calcium | 226 | 65 |
| Metformin Hcl | 210 | 62 |
| Levothyroxine Sodium | 207 | 52 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$51 across 3 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
- 2007-09-11
- Last updated
- 2007-11-26
Frequently asked questions
- What is Jack Chang's NPI number?
- Jack Chang's National Provider Identifier (NPI) is 1811182041, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jack Chang's specialty?
- Jack Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jack Chang located?
- Jack Chang's practice location on file with NPPES is 706 Rogers St, Lowell, MA 01852-4338.
- What is Jack Chang's phone number?
- The practice phone number listed in the NPPES registry for Jack Chang is (978) 937-9333.
- Does Jack Chang accept Medicare?
- Jack Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jack Chang's NPI active?
- Yes — Jack Chang's NPI (1811182041) is active in the NPPES registry as of the last update on 2007-11-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.