Gabrielle Karlsen, FNP-BC
NPI 1437826641 · Family Nurse Practitioner · Fredericksburg, VA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gabrielle Karlsen, FNP-BC is a Family Nurse Practitioner provider in Fredericksburg, VA (NPI 1437826641).
Provider details
- NPI number
- 1437826641
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-BC
- Sex
- Female
- Sole proprietor
- No
- License
- 0024182268 (VA)
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 tenure28% of score
4 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
102 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 88 | $53 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 14 | $28 |
Typical Medicare-allowed amounts for these services range $28–$53 (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 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Doxycycline Hyclate | 69 | 69 |
| Cephalexin | 39 | 39 |
| Prednisone | 37 | 36 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 36 | 36 |
| Methylprednisolone | 31 | 31 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 27 | 27 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-08-25
- Last updated
- 2021-12-04
- Certified
- 2021-12-04
Frequently asked questions
- What is Gabrielle Karlsen's NPI number?
- Gabrielle Karlsen's National Provider Identifier (NPI) is 1437826641, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gabrielle Karlsen's specialty?
- Gabrielle Karlsen is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gabrielle Karlsen located?
- Gabrielle Karlsen's practice location on file with NPPES is 4535 Spotsylvania Pkwy, Fredericksburg, VA 22408-7768.
- What is Gabrielle Karlsen's phone number?
- The practice phone number listed in the NPPES registry for Gabrielle Karlsen is (540) 374-3160.
- Does Gabrielle Karlsen accept Medicare?
- Gabrielle Karlsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gabrielle Karlsen's NPI active?
- Yes — Gabrielle Karlsen's NPI (1437826641) is active in the NPPES registry as of the last update on 2021-12-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.