Gretchen Mathewson, FNP
NPI 1639494685 · Family Nurse Practitioner · New York, NY
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gretchen Mathewson, FNP is a Family Nurse Practitioner provider in New York, NY (NPI 1639494685).
Provider details
- NPI number
- 1639494685
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Female
- Sole proprietor
- Yes
- License
- F335831 (NY)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing 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
13 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 High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 13 | $168 |
Typical Medicare-allowed amounts for these services range $168–$168 (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 · 44 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Baclofen | 180 | 53 |
| Gabapentin | 171 | 37 |
| Dalfampridinebrand: Dalfampridine Er | 93 | 28 |
| Dimethyl Fumarate | 90 | 18 |
| Glatiramer Acetatebrand: Copaxone | 83 | 12 |
| Glatiramer Acetate | 66 | — |
| Ofatumumabbrand: Kesimpta Pen | 63 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$203 across 2 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
- 2010-04-01
- Last updated
- 2010-10-25
Frequently asked questions
- What is Gretchen Mathewson's NPI number?
- Gretchen Mathewson's National Provider Identifier (NPI) is 1639494685, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gretchen Mathewson's specialty?
- Gretchen Mathewson is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gretchen Mathewson located?
- Gretchen Mathewson's practice location on file with NPPES is 5 East 98th Street, New York, NY 10029-6501.
- What is Gretchen Mathewson's phone number?
- The practice phone number listed in the NPPES registry for Gretchen Mathewson is (212) 241-6854.
- Does Gretchen Mathewson accept Medicare?
- Gretchen Mathewson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gretchen Mathewson's NPI active?
- Yes — Gretchen Mathewson's NPI (1639494685) is active in the NPPES registry as of the last update on 2010-10-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.