Nathan Ontrop, M.D.
NPI 1760778468 · Psychiatry Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathan Ontrop, M.D. is a Psychiatry Physician provider in Chicago, IL (NPI 1760778468).
Provider details
- NPI number
- 1760778468
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 125059575 (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 tenure28% of score
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
355 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 235 | $81 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 37 | $121 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 35 | $135 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 34 | $178 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 14 | $84 |
Typical Medicare-allowed amounts for these services range $81–$178 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pregabalin | 28 | — |
| Gabapentin | 23 | — |
| Lamotrigine | 19 | — |
| Trazodone Hcl | 17 | 15 |
| Escitalopram Oxalate | 14 | — |
| Hydroxyzine Hcl | 12 | 11 |
| Sertraline Hcl | 12 | — |
Practice location
Mailing address
Additional practice locations (1)
- 836 W Wellington AveChicago, IL 60657-5147Phone: (773) 296-3220Fax: (773) 296-3226
Registry dates
- Enumerated
- 2011-06-22
- Last updated
- 2025-08-07
- Certified
- 2025-08-07
Frequently asked questions
- What is Nathan Ontrop's NPI number?
- Nathan Ontrop's National Provider Identifier (NPI) is 1760778468, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathan Ontrop's specialty?
- Nathan Ontrop is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Nathan Ontrop located?
- Nathan Ontrop's practice location on file with NPPES is 25 E Washington St Ste 1601, Chicago, IL 60602.
- What is Nathan Ontrop's phone number?
- The practice phone number listed in the NPPES registry for Nathan Ontrop is (312) 725-2347.
- Does Nathan Ontrop accept Medicare?
- Nathan Ontrop is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathan Ontrop's NPI active?
- Yes — Nathan Ontrop's NPI (1760778468) is active in the NPPES registry as of the last update on 2025-08-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.