Megan Williams, FNP-C
NPI 1598238925 · Family Nurse Practitioner · Saint Charles, MO
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Megan Williams, FNP-C is a Family Nurse Practitioner provider in Saint Charles, MO (NPI 1598238925).
Provider details
- NPI number
- 1598238925
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-C
- Sex
- Female
- Sole proprietor
- No
- License
- 2019000530 (MO)
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
7 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
489 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 391 | $78 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 48 | $106 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 26 | $54 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 24 | $7 |
Typical Medicare-allowed amounts for these services range $7–$106 (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 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methylprednisolone | 92 | 84 |
| Azithromycin | 91 | 87 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 73 | 63 |
| Amoxicillin | 71 | 69 |
| Atorvastatin Calcium | 70 | 40 |
| Prednisone | 69 | 64 |
| Omeprazole | 52 | 25 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$15 across 1 record (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
Additional practice locations (1)
- 1 Barnes Jewish Hospital PlzSaint Louis, MO 63110-1003Phone: (314) 368-9169
Registry dates
- Enumerated
- 2019-01-08
- Last updated
- 2020-10-28
- Certified
- 2020-10-28
Frequently asked questions
- What is Megan Williams's NPI number?
- Megan Williams's National Provider Identifier (NPI) is 1598238925, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Megan Williams's specialty?
- Megan Williams is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Megan Williams located?
- Megan Williams's practice location on file with NPPES is 711 Veterans Memorial Pkwy Ste 300, Saint Charles, MO 63303-2106.
- What is Megan Williams's phone number?
- The practice phone number listed in the NPPES registry for Megan Williams is (636) 669-2350.
- Does Megan Williams accept Medicare?
- Megan Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Megan Williams's NPI active?
- Yes — Megan Williams's NPI (1598238925) is active in the NPPES registry as of the last update on 2020-10-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.