Marcelina Stewart, RN
NPI 1386968550 · Adult Health Nurse Practitioner · Islip, NY
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcelina Stewart, RN is a Adult Health Nurse Practitioner provider in Islip, NY (NPI 1386968550).
Provider details
- NPI number
- 1386968550
- Entity type
- Individual
- Primary specialty
- Adult Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN
- Sex
- Female
- Sole proprietor
- Yes
- License
- 585456-1 (NY)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
152 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 69 | $88 |
| Face-To-Face Educational Services Related to the Care of Chronic Kidney Disease; Individual, Per Session, Per One HourG0420 | 43 | $100 |
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 22 | $277 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 18 | $333 |
Typical Medicare-allowed amounts for these services range $88–$333 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 81 | 36 |
| Calcium Acetate | 78 | 22 |
| Sevelamer Carbonate | 70 | 30 |
| Midodrine Hcl | 45 | 12 |
| Hydralazine Hcl | 44 | 19 |
| Carvedilol | 42 | 20 |
| Torsemide | 41 | 14 |
| Pantoprazole Sodium | 24 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$80 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-03-17
- Last updated
- 2021-08-19
- Certified
- 2021-08-19
Frequently asked questions
- What is Marcelina Stewart's NPI number?
- Marcelina Stewart's National Provider Identifier (NPI) is 1386968550, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcelina Stewart's specialty?
- Marcelina Stewart is listed in the NPPES registry with a primary specialty of Adult Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marcelina Stewart located?
- Marcelina Stewart's practice location on file with NPPES is 61 Tamarack St, Islip, NY 11751-1909.
- What is Marcelina Stewart's phone number?
- The practice phone number listed in the NPPES registry for Marcelina Stewart is (917) 515-6271.
- Does Marcelina Stewart accept Medicare?
- Marcelina Stewart is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcelina Stewart's NPI active?
- Yes — Marcelina Stewart's NPI (1386968550) is active in the NPPES registry as of the last update on 2021-08-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.