Thomas Nielsen, M.D.
NPI 1235138546 · Otolaryngology Physician · Chicago, IL
Thomas Nielsen, M.D. is a Otolaryngology Physician provider in Chicago, IL (NPI 1235138546).
Provider details
- NPI number
- 1235138546
- Entity type
- Individual
- Primary specialty
- Otolaryngology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036072375 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
- 2005-07-19
- Last updated
- 2011-05-04
Frequently asked questions
- What is Thomas Nielsen's NPI number?
- Thomas Nielsen's National Provider Identifier (NPI) is 1235138546, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Nielsen's specialty?
- Thomas Nielsen is listed in the NPPES registry with a primary specialty of Otolaryngology Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Nielsen located?
- Thomas Nielsen's practice location on file with NPPES is 1611 W Harrison St, Chicago, IL 60612-4861.
- What is Thomas Nielsen's phone number?
- The practice phone number listed in the NPPES registry for Thomas Nielsen is (312) 942-6100.
- Is Thomas Nielsen's NPI active?
- Yes — Thomas Nielsen's NPI (1235138546) is active in the NPPES registry as of the last update on 2011-05-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.