Rebecca Williams, PHD
NPI 1538509294 · Surgery Physician · Madison, WI
Enrolled with Medicare as Practitioner - Surgical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rebecca Williams, PHD is a Surgery Physician provider in Madison, WI (NPI 1538509294).
Provider details
- NPI number
- 1538509294
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- PHD
- Sex
- Female
- Sole proprietor
- No
- License
- 77226-20 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
125 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) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 70 | $225 |
| Fine Needle Aspiration Biopsy Using Ultrasound Guidance, First Growth10005 | 41 | $135 |
| Fine Needle Aspiration Biopsy Using Ultrasound Guidance, Each Additional Growth10006 | 14 | $63 |
Typical Medicare-allowed amounts for these services range $63–$225 (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 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Calcitriol | 13 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 675 N Saint Clair St Ste 21-700Chicago, IL 60611-5975Phone: (312) 695-0990Fax: (312) 695-1144
Registry dates
- Enumerated
- 2013-06-26
- Last updated
- 2024-01-11
- Certified
- 2024-01-11
Frequently asked questions
- What is Rebecca Williams's NPI number?
- Rebecca Williams's National Provider Identifier (NPI) is 1538509294, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rebecca Williams's specialty?
- Rebecca Williams is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Rebecca Williams located?
- Rebecca Williams's practice location on file with NPPES is 2905 Commercial Ave Apt 2, Madison, WI 53704-4855.
- What is Rebecca Williams's phone number?
- The practice phone number listed in the NPPES registry for Rebecca Williams is (608) 242-2888.
- Does Rebecca Williams accept Medicare?
- Rebecca Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rebecca Williams's NPI active?
- Yes — Rebecca Williams's NPI (1538509294) is active in the NPPES registry as of the last update on 2024-01-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.