Stephen Mackler, M.D.
NPI 1669442745 · Internal Medicine Physician · Dartmouth, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Mackler, M.D. is a Internal Medicine Physician provider in Dartmouth, MA (NPI 1669442745).
Provider details
- NPI number
- 1669442745
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 51204 (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
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
5,650 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 | 1,086 | $91 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 519 | $9 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 470 | $131 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 410 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 389 | $10 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 364 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 96 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 743 | 190 |
| Amlodipine Besylate | 742 | 183 |
| Omeprazole | 406 | 117 |
| Levothyroxine Sodium | 357 | 83 |
| Alprazolam | 338 | 56 |
| Simvastatin | 305 | 86 |
| Metformin Hcl | 243 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$82 across 4 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
Additional practice locations (1)
- 535 Faunce Corner RoadNorth Dartmouth, MA 02747Phone: (508) 996-3991
Registry dates
- Enumerated
- 2006-01-23
- Last updated
- 2023-04-24
- Certified
- 2023-04-24
Frequently asked questions
- What is Stephen Mackler's NPI number?
- Stephen Mackler's National Provider Identifier (NPI) is 1669442745, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Mackler's specialty?
- Stephen Mackler is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Mackler located?
- Stephen Mackler's practice location on file with NPPES is 535 Faunce Corner Rd, Dartmouth, MA 02747-1242.
- What is Stephen Mackler's phone number?
- The practice phone number listed in the NPPES registry for Stephen Mackler is (508) 996-3991.
- Does Stephen Mackler accept Medicare?
- Stephen Mackler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Mackler's NPI active?
- Yes — Stephen Mackler's NPI (1669442745) is active in the NPPES registry as of the last update on 2023-04-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.