Quick answers
- Does Stephanie A. Mercer accept Medicare assignment?
- Yes. Medicare's clinician data says Stephanie A. Mercer 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 Stephanie A. Mercer see?
- In 2024, CMS data shows 409 Original Medicare patients and 851 services for Stephanie A. Mercer. This counts Original Medicare only and measures volume, not quality.
- What is Stephanie A. Mercer's NPI number?
- 1457668410. 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 Stephanie A. Mercer, 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 | 409 |
|---|---|
| Services billed to Medicare | 851 |
| Different services or procedures | 45 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)218 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)93 services
- Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19) (87811)85 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)56 services
- Automated urinalysis test (81003)50 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 pressure66%
- Arthritis51%
- Ischemic heart disease33%
- Anxiety31%
- Diabetes27%
Practice locations
Addresses where Stephanie A. Mercer is enrolled with Medicare (CMS data updated October 2, 2026).
- 1950 Jericho TpkeEast Northport, NY 11731 (631) 238‑3065
- 377 S Oyster Bay RdPlainview, NY 11803 (516) 537‑9061
Group practices
Medicare enrollment lists Stephanie A. Mercer as a member of this group (CMS data updated October 2, 2026).
- North Shore Lij Urgent Care PC390 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in East Northport
Clinicians with the same Medicare primary specialty in East Northport, NY — not a recommendation.
Other clinicians in North Shore Lij Urgent Care PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457668410 |
| 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