Quick answers
- Does Lawrence S. Greenstein accept Medicare assignment?
- Yes. Medicare's clinician data says Lawrence S. Greenstein accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Lawrence S. Greenstein see?
- In 2024, CMS data shows 192 Original Medicare patients and 5,628 services for Lawrence S. Greenstein. This counts Original Medicare only and measures volume, not quality.
- What is Lawrence S. Greenstein's NPI number?
- 1447688635. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Lawrence S. Greenstein, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 192 |
|---|---|
| Services billed to Medicare | 5,628 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 50 |
Most frequent services
- Psychotherapy, 45 minutes (90834)3,996 services
- Psychotherapy, 30 minutes (90832)1,017 services
- Family psychotherapy with patient, 50 minutes (90847)545 services
- Group psychotherapy (90853)42 services
- Psychiatric diagnostic evaluation (90791)14 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Depression75%
- Anxiety75%
- High cholesterol65%
- High blood pressure52%
- Diabetes27%
- Arthritis16%
Practice locations
Addresses where Lawrence S. Greenstein is enrolled with Medicare (CMS data updated October 2, 2026).
- 1542 Kuser Rd, Suite B7Hamilton, NJ 08619 (609) 989‑9211
Group practices
Medicare enrollment lists Lawrence S. Greenstein as a member of this group (CMS data updated October 2, 2026).
- Arc Mercer Inc7 clinicians in the group
Specialties
- Clinical Social Workerprimary
Other clinical social workers in Hamilton
Clinicians with the same Medicare primary specialty in Hamilton, NJ — not a recommendation.
Other clinicians in Arc Mercer Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| School | Rutgers New Jersey Medical School |
| Graduation year | 2011 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1447688635 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians