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William Johnson, MD
NPI 1255381307 · Internal Medicine Physician · Chicago, IL
William Johnson, MD is a Internal Medicine Physician provider in Chicago, IL (NPI 1255381307).
Provider details
- NPI number
- 1255381307
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(84/100 index)
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
1701 W Monterey Ave
Suite 1
Chicago, IL 60643-4257
Phone: (773) 233-5850
Street-level locationGet directions
Mailing address
3601 W 183rd St
Hazel Crest, IL 60429-2409
Registry dates
- Enumerated
- 2006-05-11
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Johnson's NPI number?
- William Johnson's National Provider Identifier (NPI) is 1255381307, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Johnson's specialty?
- William Johnson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Johnson located?
- William Johnson's practice location on file with NPPES is 1701 W Monterey Ave, Chicago, IL 60643-4257.
- What is William Johnson's phone number?
- The practice phone number listed in the NPPES registry for William Johnson is (773) 233-5850.
- Is William Johnson's NPI active?
- Yes — William Johnson's NPI (1255381307) 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.