IndividualActive
John Van Aalst
NPI 1255340048 · Pediatrics Physician · Chicago, IL
John Van Aalst is a Pediatrics Physician provider in Chicago, IL (NPI 1255340048).
Provider details
- NPI number
- 1255340048
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 03655172 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
966 W. 21 Street
Chicago, IL 60608
Phone: (773) 254-1400
Fax: (312) 829-6829
Street-level locationGet directions
Mailing address
1004 N Kenilworth Ave
Oak Park, IL 60302-1318
Registry dates
- Enumerated
- 2006-08-08
- Last updated
- 2007-10-30
Frequently asked questions
- What is John Van Aalst's NPI number?
- John Van Aalst's National Provider Identifier (NPI) is 1255340048, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Van Aalst's specialty?
- John Van Aalst is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is John Van Aalst located?
- John Van Aalst's practice location on file with NPPES is 966 W. 21 Street, Chicago, IL 60608.
- What is John Van Aalst's phone number?
- The practice phone number listed in the NPPES registry for John Van Aalst is (773) 254-1400.
- Is John Van Aalst's NPI active?
- Yes — John Van Aalst's NPI (1255340048) is active in the NPPES registry as of the last update on 2007-10-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.