Quick answers
- Does Joan S. Haselkorn accept Medicare assignment?
- Yes. Medicare's clinician data says Joan S. Haselkorn 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 Joan S. Haselkorn see?
- In 2024, CMS data shows 821 Original Medicare patients and 4,722 services for Joan S. Haselkorn. This counts Original Medicare only and measures volume, not quality.
- What is Joan S. Haselkorn's NPI number?
- 1235105099. 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 Joan S. Haselkorn, 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 | 821 |
|---|---|
| Services billed to Medicare | 4,722 |
| Different services or procedures | 31 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Urinalysis, manual test (81002)823 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)732 services
- Stool analysis for blood to screen for colon tumors (82270)692 services
- Annual depression screening, 5 to 15 minutes (G0444)674 services
- Screening papanicolaou smear; obtaining, preparing and conveyance of cervical or vaginal smear to laboratory (Q0091)571 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).
- High cholesterol75%
- High blood pressure65%
- Arthritis51%
- Osteoporosis37%
- Diabetes29%
- Anxiety23%
Hospitals where Joan S. Haselkorn works
Medicare's Facility Affiliation Data lists Joan S. Haselkorn at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Mercy Medical CenterRockville Centre, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330259
- Mount Sinai South NassauOceanside, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330198
- North Shore University HospitalManhasset, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330106
- St Francis Hospital - The Heart CenterRoslyn, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330182
Practice locations
Addresses where Joan S. Haselkorn is enrolled with Medicare (CMS data updated October 2, 2026).
- 556 Merrick Rd, Suite 200Rockville Centre, NY 11570 (516) 255‑2044
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Rockville Centre
Clinicians with the same Medicare primary specialty in Rockville Centre, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1982 (44 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235105099 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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