Dan Williams, PA, PSYD
NPI 1801874664 · Medical Physician Assistant · Janesville, WI
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dan Williams, PA, PSYD is a Medical Physician Assistant provider in Janesville, WI (NPI 1801874664).
Provider details
- NPI number
- 1801874664
- Entity type
- Individual
- Primary specialty
- Medical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA, PSYD
- Sex
- Male
- Sole proprietor
- No
- License
- 8500535 (IL)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
20 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
483 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 99 | $104 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 67 | $137 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 67 | $74 |
| Detection Test By Immunoassay With Direct Visual Observation for Severe Acute Respiratory Syndrome Coronavirus 2 (covid-19)87811 | 66 | $41 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 58 | $90 |
| Automated Urinalysis Test |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 190 | 170 |
| Cephalexin | 70 | 69 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 62 | 53 |
| Doxycycline Hyclate | 59 | 58 |
| Azithromycin | 37 | 36 |
| Tramadol Hcl | 23 | 21 |
| Triamcinolone Acetonide | 22 | 18 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-03
- Last updated
- 2016-10-26
Frequently asked questions
- What is Dan Williams's NPI number?
- Dan Williams's National Provider Identifier (NPI) is 1801874664, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dan Williams's specialty?
- Dan Williams is listed in the NPPES registry with a primary specialty of Medical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Dan Williams located?
- Dan Williams's practice location on file with NPPES is 3524 E Milwaukee St, Janesville, WI 53546-1626.
- What is Dan Williams's phone number?
- The practice phone number listed in the NPPES registry for Dan Williams is (608) 756-7100.
- Does Dan Williams accept Medicare?
- Dan Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dan Williams's NPI active?
- Yes — Dan Williams's NPI (1801874664) is active in the NPPES registry as of the last update on 2016-10-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.