Jonathan Nassos, M.D.
NPI 1770761934 · Orthopaedic Surgery Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathan Nassos, M.D. is a Orthopaedic Surgery Physician provider in Chicago, IL (NPI 1770761934).
Provider details
- NPI number
- 1770761934
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036114903 (IL)
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
18 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Meloxicam | 20 | 11 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 16 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-02-08
- Last updated
- 2008-10-23
Frequently asked questions
- What is Jonathan Nassos's NPI number?
- Jonathan Nassos's National Provider Identifier (NPI) is 1770761934, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathan Nassos's specialty?
- Jonathan Nassos is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathan Nassos located?
- Jonathan Nassos's practice location on file with NPPES is 6374 N Lincoln Ave, Chicago, IL 60659-1275.
- What is Jonathan Nassos's phone number?
- The practice phone number listed in the NPPES registry for Jonathan Nassos is (773) 463-2377.
- Does Jonathan Nassos accept Medicare?
- Jonathan Nassos is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathan Nassos's NPI active?
- Yes — Jonathan Nassos's NPI (1770761934) is active in the NPPES registry as of the last update on 2008-10-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.