Stephen Louie, MD
NPI 1700879350 · Hematology (Internal Medicine) Physician · Boston, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Louie, MD is a Hematology (Internal Medicine) Physician provider in Boston, MA (NPI 1700879350).
Provider details
- NPI number
- 1700879350
- Entity type
- Individual
- Primary specialty
- Hematology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- 39656 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
508 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 205 | $98 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 106 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 86 | $140 |
| Administration of Influenza Virus VaccineG0008 | 57 | $35 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 54 | $141 |
Typical Medicare-allowed amounts for these services range $9–$141 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Simvastatin | 151 | 42 |
| Amlodipine Besylate | 104 | 26 |
| Metformin Hcl | 90 | 25 |
| Glipizide | 49 | 15 |
| Atorvastatin Calcium | 49 | 14 |
| Losartan Potassium | 45 | 14 |
| Metoprolol Succinate | 44 | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-30
- Last updated
- 2025-09-11
Frequently asked questions
- What is Stephen Louie's NPI number?
- Stephen Louie's National Provider Identifier (NPI) is 1700879350, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Louie's specialty?
- Stephen Louie is listed in the NPPES registry with a primary specialty of Hematology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Louie located?
- Stephen Louie's practice location on file with NPPES is 228 Harrison Ave, Boston, MA 02111-3000.
- What is Stephen Louie's phone number?
- The practice phone number listed in the NPPES registry for Stephen Louie is (617) 423-5511.
- Does Stephen Louie accept Medicare?
- Stephen Louie is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Louie's NPI active?
- Yes — Stephen Louie's NPI (1700879350) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.