Marcy Williamson, FNP
NPI 1366183923 · Family Nurse Practitioner · Morristown, TN
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcy Williamson, FNP is a Family Nurse Practitioner provider in Morristown, TN (NPI 1366183923).
Provider details
- NPI number
- 1366183923
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Female
- Sole proprietor
- No
- License
- 31411 (TN)
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
4 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
664 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) |
|---|---|---|
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 130 | $8 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 117 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 116 | $10 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 45 | $11 |
| Gammaglobulin (immune System Protein) Measurement82784 | 35 | $9 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 33 | $97 |
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 |
|---|---|---|
| Anastrozole | 143 | 52 |
| Letrozole | 77 | 27 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 48 | 23 |
| Apixabanbrand: Eliquis | 33 | — |
| Oxycodone Hcl | 29 | 19 |
| Gabapentin | 24 | 11 |
| Hydroxyurea | 24 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,476 across 163 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
- 2022-04-06
- Last updated
- 2022-04-06
- Certified
- 2022-02-28
Frequently asked questions
- What is Marcy Williamson's NPI number?
- Marcy Williamson's National Provider Identifier (NPI) is 1366183923, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcy Williamson's specialty?
- Marcy Williamson is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marcy Williamson located?
- Marcy Williamson's practice location on file with NPPES is 420 W Morris Blvd Ste 410, Morristown, TN 37813-2292.
- What is Marcy Williamson's phone number?
- The practice phone number listed in the NPPES registry for Marcy Williamson is (423) 587-0491.
- Does Marcy Williamson accept Medicare?
- Marcy Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcy Williamson's NPI active?
- Yes — Marcy Williamson's NPI (1366183923) is active in the NPPES registry as of the last update on 2022-04-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.