Physician Profile
Nathan D. Ontrop, M.D.
Unclaimed ProfileAbout Dr. Ontrop
Based in Chicago, IL, Nathan D. Ontrop, M.D. is listed in the NPI registry under psychiatry. Nathan graduated from Loyola University of Chicago, Stritch School of Medicine in 2011. According to Medicare claims data, Nathan cared for 137 Medicare patients across 355 services. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes, subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes, and initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
Source: NPPES NPI Registry
Contact Information
- (312) 725-2347
- Email not available
Practice Locations
25 E WASHINGTON ST STE 1601
Chicago, IL 60602
Conditions Commonly Evaluated or Treated
Within Psychiatry generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Anxiety, trauma, and obsessive-compulsive
Mood disorders
Psychotic disorders
Substance-related and addictive
Addiction & Substance Use
Cognitive and adjustment
Eating Disorders
Eating, sleep, and somatic
Mood & Depression
Neurodevelopmental and behavioral
Personality and dissociative
Sleep & Wakefulness
Procedures & services
Most searched procedures
- Anxiety and depression treatment
- Cognitive behavioral therapy
- Medication management
- Psychiatric evaluation
- Telepsychiatry
Assessment
Addiction care
Addiction Medicine
Assessments
Brain stimulation
Consultations
Diagnostics
Inpatient care
Interventional psychiatry
Psychotherapy
Sleep Medicine
Specialized care
Therapy
Therapy and care
Procedures Most Often Billed to Medicare
355 services · 137 patients · 5 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
235 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
37 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
35 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
34 |
| Hospital discharge day management, 30 minutes or less | Office visit | 99238 |
14 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other psychiatrists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 6
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 3 groups
Other psychiatrists in Chicago 8
Same specialty, same city.
Trained at Loyola University of Chicago, Stritch School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2011 at Loyola University of Chicago, Stritch School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Nathan D. Ontrop's specialty?
Nathan D. Ontrop is a psychiatrist in Chicago, IL. That is the designation recorded for this NPI in the federal registry, where it is listed as “Psychiatry”.
NPI registry
Where can I find Nathan D. Ontrop?
Nathan D. Ontrop is listed at 25 E Washington St Ste 1601, Chicago, IL 60602. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Nathan D. Ontrop?
The number on file is (312) 725-2347. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Nathan D. Ontrop's NPI number?
Nathan D. Ontrop's National Provider Identifier is 1760778468. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Nathan D. Ontrop's education?
Nathan D. Ontrop attended Loyola University of Chicago, Stritch School of Medicine, graduating in 2011. This comes from the CMS National Downloadable File.
CMS public data
How long has Nathan D. Ontrop been practicing?
Nathan D. Ontrop has 15 years experience. Calculated from a graduation year of 2011, reported in the CMS National Downloadable File.
CMS public data
What is Nathan D. Ontrop known for?
According to Medicare billing data, Nathan D. Ontrop the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Nathan D. Ontrop confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Nathan D. Ontrop. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.