Mazen Nasrallah, M.D
NPI 1609210004 · Rheumatology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mazen Nasrallah, M.D is a Rheumatology Physician provider in Boston, MA (NPI 1609210004).
Provider details
- NPI number
- 1609210004
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- Yes
- License
- 266134 (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
13 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
1,017 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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 390 | $16 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 255 | $98 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 170 | $142 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 79 | $179 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 51 | $131 |
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 |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 266 | 74 |
| Prednisone | 195 | 75 |
| Hydroxychloroquine Sulfate | 169 | 62 |
| Alendronate Sodium | 91 | 42 |
| Adalimumabbrand: Humira(cf) Pen | 88 | 12 |
| Allopurinol | 86 | 25 |
| Tocilizumabbrand: Actemra | 62 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-04-29
- Last updated
- 2018-07-23
Frequently asked questions
- What is Mazen Nasrallah's NPI number?
- Mazen Nasrallah's National Provider Identifier (NPI) is 1609210004, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mazen Nasrallah's specialty?
- Mazen Nasrallah is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Mazen Nasrallah located?
- Mazen Nasrallah's practice location on file with NPPES is 55 Fruit Street, Boston, MA 02114.
- What is Mazen Nasrallah's phone number?
- The practice phone number listed in the NPPES registry for Mazen Nasrallah is (617) 726-3165.
- Does Mazen Nasrallah accept Medicare?
- Mazen Nasrallah is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mazen Nasrallah's NPI active?
- Yes — Mazen Nasrallah's NPI (1609210004) is active in the NPPES registry as of the last update on 2018-07-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.