William Greenfield, MD
NPI 1740272988 · Family Medicine Physician · Libertyville, IL
Enrolled with Medicare as Order and Referring Only - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Greenfield, MD is a Family Medicine Physician provider in Libertyville, IL (NPI 1740272988).
Provider details
- NPI number
- 1740272988
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
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
83% 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
- 2005-08-15
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Greenfield's NPI number?
- William Greenfield's National Provider Identifier (NPI) is 1740272988, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Greenfield's specialty?
- William Greenfield is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Greenfield located?
- William Greenfield's practice location on file with NPPES is 716 S Milwaukee Ave, Libertyville, IL 60048-3225.
- What is William Greenfield's phone number?
- The practice phone number listed in the NPPES registry for William Greenfield is (847) 362-1393.
- Does William Greenfield accept Medicare?
- William Greenfield is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Greenfield's NPI active?
- Yes — William Greenfield's NPI (1740272988) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.