Mark Gelfand, MD
NPI 1801849658 · Internal Medicine Physician · Brooklyn, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Gelfand, MD is a Internal Medicine Physician provider in Brooklyn, NY (NPI 1801849658).
Provider details
- NPI number
- 1801849658
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- 211150 (NY)
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
28,418 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 1,484 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 1,324 | $100 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 1,160 | $8 |
| Ferritin (blood Protein) Level82728 | 1,043 | $13 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 1,039 | $10 |
| Iron Level83540 | 1,037 | $6 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 215 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 1,303 | 198 |
| Atorvastatin Calcium | 1,085 | 169 |
| Rosuvastatin Calcium | 989 | 152 |
| Metoprolol Succinate | 839 | 120 |
| Levothyroxine Sodium | 670 | 93 |
| Losartan Potassium | 659 | 104 |
| Omeprazole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$620 across 30 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
- 2006-05-19
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Gelfand's NPI number?
- Mark Gelfand's National Provider Identifier (NPI) is 1801849658, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Gelfand's specialty?
- Mark Gelfand is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Gelfand located?
- Mark Gelfand's practice location on file with NPPES is 415 Oceanview Ave, Brooklyn, NY 11235.
- What is Mark Gelfand's phone number?
- The practice phone number listed in the NPPES registry for Mark Gelfand is (718) 934-4842.
- Does Mark Gelfand accept Medicare?
- Mark Gelfand is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Gelfand's NPI active?
- Yes — Mark Gelfand's NPI (1801849658) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.