Charissa Williams, APNP
NPI 1700426079 · Family Nurse Practitioner · Appleton, WI
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charissa Williams, APNP is a Family Nurse Practitioner provider in Appleton, WI (NPI 1700426079).
Provider details
- NPI number
- 1700426079
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- APNP
- Sex
- Female
- Sole proprietor
- No
- License
- 197423 (WI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
6 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
293 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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 109 | $13 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 99 | $102 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 85 | $144 |
Typical Medicare-allowed amounts for these services range $13–$144 (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 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 77 | 25 |
| Prochlorperazine Maleate | 39 | 29 |
| Letrozole | 33 | 13 |
| Ondansetron Hcl | 31 | 29 |
| Potassium Chloride | 26 | 12 |
| Oxycodone Hcl | 24 | 19 |
| Tamoxifen Citrate | 23 | — |
| Prednisone | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$296 across 5 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
- 2020-01-14
- Last updated
- 2020-01-31
- Certified
- 2020-01-31
Frequently asked questions
- What is Charissa Williams's NPI number?
- Charissa Williams's National Provider Identifier (NPI) is 1700426079, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charissa Williams's specialty?
- Charissa Williams is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Charissa Williams located?
- Charissa Williams's practice location on file with NPPES is 2500 E Capitol Drive, Appleton, WI 54911-8735.
- What is Charissa Williams's phone number?
- The practice phone number listed in the NPPES registry for Charissa Williams is (920) 364-3600.
- Does Charissa Williams accept Medicare?
- Charissa Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charissa Williams's NPI active?
- Yes — Charissa Williams's NPI (1700426079) is active in the NPPES registry as of the last update on 2020-01-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.