Joseph Mermelstein, MD
NPI 1689963662 · Gastroenterology Physician · Scarsdale, NY
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Mermelstein, MD is a Gastroenterology Physician provider in Scarsdale, NY (NPI 1689963662).
Provider details
- NPI number
- 1689963662
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 273034 (NY)
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 tenure25% of score
15 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
791 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 | 211 | $104 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 122 | $190 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 76 | $128 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 59 | $116 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 50 | $139 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 129 | 59 |
| Omeprazole | 66 | 28 |
| Linaclotidebrand: Linzess | 34 | — |
| Famotidine | 25 | — |
| Mesalamine | 15 | — |
| Sod Sulf/Pot Chloride/Mag Sulfbrand: Sutab | 15 | 15 |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 14 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$199 across 10 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
- 2011-03-30
- Last updated
- 2021-05-24
- Certified
- 2021-05-10
Frequently asked questions
- What is Joseph Mermelstein's NPI number?
- Joseph Mermelstein's National Provider Identifier (NPI) is 1689963662, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Mermelstein's specialty?
- Joseph Mermelstein is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Mermelstein located?
- Joseph Mermelstein's practice location on file with NPPES is 550 Mamaroneck Avenue, Scarsdale, NY 10583.
- What is Joseph Mermelstein's phone number?
- The practice phone number listed in the NPPES registry for Joseph Mermelstein is (914) 723-8100.
- Does Joseph Mermelstein accept Medicare?
- Joseph Mermelstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Mermelstein's NPI active?
- Yes — Joseph Mermelstein's NPI (1689963662) is active in the NPPES registry as of the last update on 2021-05-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.