Quick answers
- Does Guisela M. Hernandez accept Medicare assignment?
- Yes. Medicare's clinician data says Guisela M. Hernandez 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 Guisela M. Hernandez see?
- In 2024, CMS data shows 240 Original Medicare patients and 650 services for Guisela M. Hernandez. This counts Original Medicare only and measures volume, not quality.
- What is Guisela M. Hernandez's NPI number?
- 1033301015. 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 Guisela M. Hernandez, 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 | 240 |
|---|---|
| Services billed to Medicare | 650 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 84 |
Most frequent services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)246 services
- Advance care planning, first 30 minutes (99497)236 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)85 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)65 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 blood pressure75%
- High cholesterol75%
- Diabetes66%
- Arthritis63%
- Alzheimer's disease or dementia56%
- Ischemic heart disease55%
Hospitals where Guisela M. Hernandez works
Medicare's Facility Affiliation Data lists Guisela M. Hernandez 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.
- Long Island Jewish Medical CenterNew Hyde Park, NY · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 330195
Practice locations
Addresses where Guisela M. Hernandez is enrolled with Medicare (CMS data updated October 2, 2026).
- 900 Franklin AveValley Stream, NY 11580 (516) 256‑6000
Group practices
Medicare enrollment lists Guisela M. Hernandez as a member of this group (CMS data updated October 2, 2026).
- North Shore-Lij Medical PC6,440 clinicians in the group
Specialties
- Internal Medicineprimary
- Hospice/Palliative Carealso
Other internal medicine doctors in Valley Stream
Clinicians with the same Medicare primary specialty in Valley Stream, NY — not a recommendation.
Other clinicians in North Shore-Lij Medical PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Ponce School Of Medicine |
| Graduation year | 2005 (21 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033301015 |
| 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