William Arnold, MD
NPI 1457305823 · Rheumatology Physician · Skokie, IL
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Arnold, MD is a Rheumatology Physician provider in Skokie, IL (NPI 1457305823).
Provider details
- NPI number
- 1457305823
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036-043731 (IL)
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
1 documented practice location
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
Registry dates
- Enumerated
- 2006-05-20
- Last updated
- 2014-07-02
Frequently asked questions
- What is William Arnold's NPI number?
- William Arnold's National Provider Identifier (NPI) is 1457305823, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Arnold's specialty?
- William Arnold is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is William Arnold located?
- William Arnold's practice location on file with NPPES is 4709 Golf Rd, Skokie, IL 60076-1231.
- What is William Arnold's phone number?
- The practice phone number listed in the NPPES registry for William Arnold is (847) 869-7233.
- Does William Arnold accept Medicare?
- William Arnold is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Arnold's NPI active?
- Yes — William Arnold's NPI (1457305823) is active in the NPPES registry as of the last update on 2014-07-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.