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William Ahrens
NPI 1336248301 · Emergency Medicine Physician · Chicago, IL
William Ahrens is a Emergency Medicine Physician provider in Chicago, IL (NPI 1336248301).
Provider details
- NPI number
- 1336248301
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
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
19 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
1740 W Taylor St
Chicago, IL 60612-7232
Phone: (866) 600-2273
Street-level locationGet directions
Mailing address
809 S Marshfield Ave
Chicago, IL 60612-4305
Registry dates
- Enumerated
- 2006-09-22
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Ahrens's NPI number?
- William Ahrens's National Provider Identifier (NPI) is 1336248301, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ahrens's specialty?
- William Ahrens is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Ahrens located?
- William Ahrens's practice location on file with NPPES is 1740 W Taylor St, Chicago, IL 60612-7232.
- What is William Ahrens's phone number?
- The practice phone number listed in the NPPES registry for William Ahrens is (866) 600-2273.
- Is William Ahrens's NPI active?
- Yes — William Ahrens's NPI (1336248301) 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.