Irwin Grosman, MD
NPI 1821059668 · Gastroenterology Physician · Brooklyn, NY
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Irwin Grosman, MD is a Gastroenterology Physician provider in Brooklyn, NY (NPI 1821059668).
Provider details
- NPI number
- 1821059668
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 165503 (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
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
567 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 | 131 | $105 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 75 | $56 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 70 | $194 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 57 | $104 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 53 | $280 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope |
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 | 212 | 77 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 179 | 172 |
| Omeprazole | 47 | 18 |
| Famotidine | 41 | 17 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 21 | 19 |
| Mesalamine | 20 | — |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$10,871 across 21 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
- 2006-03-31
- Last updated
- 2024-07-30
- Certified
- 2024-07-30
Frequently asked questions
- What is Irwin Grosman's NPI number?
- Irwin Grosman's National Provider Identifier (NPI) is 1821059668, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irwin Grosman's specialty?
- Irwin Grosman is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Irwin Grosman located?
- Irwin Grosman's practice location on file with NPPES is 50 Court St, Brooklyn, NY 11201-4879.
- What is Irwin Grosman's phone number?
- The practice phone number listed in the NPPES registry for Irwin Grosman is (718) 522-3131.
- Does Irwin Grosman accept Medicare?
- Irwin Grosman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Irwin Grosman's NPI active?
- Yes — Irwin Grosman's NPI (1821059668) is active in the NPPES registry as of the last update on 2024-07-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.