Physician Profile
Marc L. Greenwald, MD
Unclaimed ProfileAbout Dr. Greenwald
Marc L. Greenwald, MD practices colon & rectal surgery in Great Neck, NY. Marc is a 1985 graduate of Albert Einstein College of Medicine of Yeshiva University. Marc is also listed as specializing in surgery. Medicare claims data shows Marc provided 567 services to 494 patients. The services billed most often include diagnostic exam of anus using an endoscope, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and new patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (516) 482-8657
- Email not available
Practice Locations
310 EAST SHORE ROAD SUTE 203
Great Neck, NY 11023
Procedures Most Often Billed to Medicare
567 services · 494 patients · 18 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Diagnostic exam of anus using an endoscope | Procedure | 46600 |
92 | More often than most peers in Colon & Rectal Surgery |
| Removal of external hemorrhoids by rubber banding | Procedure | 46221 |
33 | As often as other peers in Colon & Rectal Surgery |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
22 | More often than most peers in Colon & Rectal Surgery |
| Partial release of large bowel and partial removal of large bowel using an endoscope | Procedure | 44213 |
19 | More often than most peers in Colon & Rectal Surgery |
| Diagnostic exam of lower portion of large bowel using a flexible endoscope | Procedure | 45330 |
16 | As often as other peers in Colon & Rectal Surgery |
| Partial removal of large bowel and reattachment to rectum using an endoscope | Procedure | 44207 |
15 | More often than most peers in Colon & Rectal Surgery |
| Diagnostic exam of large bowel using a flexible endoscope | Procedure | 45378 |
12 | |
| Partial removal of large bowel using an endoscope | Procedure | 44204 |
12 | As often as other peers in Colon & Rectal Surgery |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
11 | |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
11 | More often than most peers in Colon & Rectal Surgery |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other colorectal surgeons at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 6
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 4 groups
Trained at Albert Einstein College of Medicine of Yeshiva University 7
Other providers in the same specialty who trained at the same institution.
Class of 1985 at Albert Einstein College of Medicine of Yeshiva University 8
Providers who graduated from the same medical school in the same year.
Also performs Diagnostic exam of anus using an endoscope 8
Providers in NY who bill this service to Medicare most often.
Common questions
What is Dr. Greenwald's specialty?
Dr. Greenwald is a colorectal surgeon in Great Neck, NY. That is the designation recorded for this NPI in the federal registry, where it is listed as “Colon & Rectal Surgery”.
NPI registry
Where can I find Dr. Greenwald?
Dr. Greenwald is listed at 310 East Shore Road Sute 203, Great Neck, NY 11023. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Greenwald?
The number on file is (516) 482-8657. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Greenwald?
Dr. Greenwald's National Provider Identifier is 1174618557. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Greenwald's medical education?
Dr. Greenwald attended Albert Einstein College of Medicine of Yeshiva University, graduating in 1985. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Greenwald have?
Dr. Greenwald has 41 years experience. Calculated from a graduation year of 1985, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Greenwald known for?
According to Medicare billing data, Dr. Greenwald performs procedures including diagnostic exam of anus using an endoscope, removal of external hemorrhoids by rubber banding and biopsy of large bowel using a flexible endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Greenwald's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Greenwald. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.