Leonard Kassis, M.D.
NPI 1659547818 · Internal Medicine Physician · Rockville, MD
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leonard Kassis, M.D. is a Internal Medicine Physician provider in Rockville, MD (NPI 1659547818).
Provider details
- NPI number
- 1659547818
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D0054434 (MD)
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
1,093 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 | 321 | $106 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 180 | $87 |
| Face-To-Face Behavioral Counseling for Obesity, 15 MinutesG0447 | 147 | $25 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 103 | $142 |
| Hemoglobin A1c Level83036 | 100 | $10 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 74 | $21 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 136 | 46 |
| Amlodipine Besylate | 103 | 33 |
| Hydrochlorothiazide | 95 | 25 |
| Rosuvastatin Calcium | 74 | 26 |
| Levothyroxine Sodium | 71 | 20 |
| Metformin Hcl | 66 | 16 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$917 across 40 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
- 2008-05-07
- Last updated
- 2008-05-07
Frequently asked questions
- What is Leonard Kassis's NPI number?
- Leonard Kassis's National Provider Identifier (NPI) is 1659547818, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonard Kassis's specialty?
- Leonard Kassis is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Leonard Kassis located?
- Leonard Kassis's practice location on file with NPPES is 350 Suite D Fortune Terr, Rockville, MD 20854-2972.
- What is Leonard Kassis's phone number?
- The practice phone number listed in the NPPES registry for Leonard Kassis is (301) 309-0016.
- Does Leonard Kassis accept Medicare?
- Leonard Kassis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leonard Kassis's NPI active?
- Yes — Leonard Kassis's NPI (1659547818) is active in the NPPES registry as of the last update on 2008-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.