Nathan Ontrop MD Sc
NPI 1619498052 · Psychiatry Physician · Chicago, IL
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathan Ontrop MD Sc is a Psychiatry Physician organization in Chicago, IL (NPI 1619498052).
Provider details
- NPI number
- 1619498052
- Entity type
- Organization
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Nathan Ontrop, President(312) 725-2347
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
8 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
- 2017-07-06
- Last updated
- 2018-05-22
Frequently asked questions
- What is Nathan Ontrop MD Sc's NPI number?
- Nathan Ontrop MD Sc's National Provider Identifier (NPI) is 1619498052, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Nathan Ontrop MD Sc?
- Nathan Ontrop MD Sc is classified in the NPPES registry as Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Nathan Ontrop MD Sc located?
- Nathan Ontrop MD Sc's practice location on file with NPPES is 25 E Washington St Ste 1601, Chicago, IL 60602.
- What is Nathan Ontrop MD Sc's phone number?
- The practice phone number listed in the NPPES registry for Nathan Ontrop MD Sc is (312) 725-2347.
- Does Nathan Ontrop MD Sc accept Medicare?
- Nathan Ontrop MD Sc is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Nathan Ontrop MD Sc?
- The authorized official listed on Nathan Ontrop MD Sc's NPPES record is Nathan Ontrop, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Nathan Ontrop MD Sc's NPI active?
- Yes — Nathan Ontrop MD Sc's NPI (1619498052) is active in the NPPES registry as of the last update on 2018-05-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.