Calvin Williams, MD
NPI 1467408658 · Pediatric Rheumatology Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Calvin Williams, MD is a Pediatric Rheumatology Physician provider in Milwaukee, WI (NPI 1467408658).
Provider details
- NPI number
- 1467408658
- Entity type
- Individual
- Primary specialty
- Pediatric Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 44530 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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.
Practice location
Mailing address
Additional practice locations (1)
- 2575 E Evergreen DriveAppleton, WI 54913Phone: (920) 969-5353Fax: (414) 337-7201
Registry dates
- Enumerated
- 2006-05-26
- Last updated
- 2023-08-14
- Certified
- 2023-08-10
Frequently asked questions
- What is Calvin Williams's NPI number?
- Calvin Williams's National Provider Identifier (NPI) is 1467408658, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Calvin Williams's specialty?
- Calvin Williams is listed in the NPPES registry with a primary specialty of Pediatric Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Calvin Williams located?
- Calvin Williams's practice location on file with NPPES is 9000 W Wisconsin Ave, Milwaukee, WI 53226-4874.
- What is Calvin Williams's phone number?
- The practice phone number listed in the NPPES registry for Calvin Williams is (414) 266-6700.
- Does Calvin Williams accept Medicare?
- Calvin Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Calvin Williams's NPI active?
- Yes — Calvin Williams's NPI (1467408658) is active in the NPPES registry as of the last update on 2023-08-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.