Michael O'Connor
NPI 1083731327 · Anesthesiology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael O'Connor is a Anesthesiology Physician provider in Chicago, IL (NPI 1083731327).
Provider details
- NPI number
- 1083731327
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 036078429 (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
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
234 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 | 138 | $86 |
| Critical Care, First 30-74 Minutes99291 | 61 | $236 |
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 23 | $95 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 12 | $91 |
Typical Medicare-allowed amounts for these services range $86–$236 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-23
- Last updated
- 2025-09-12
- Certified
- 2025-09-12
Frequently asked questions
- What is Michael O'Connor's NPI number?
- Michael O'Connor's National Provider Identifier (NPI) is 1083731327, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael O'Connor's specialty?
- Michael O'Connor is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael O'Connor located?
- Michael O'Connor's practice location on file with NPPES is 5841 S Maryland Ave, Chicago, IL 60637-1443.
- What is Michael O'Connor's phone number?
- The practice phone number listed in the NPPES registry for Michael O'Connor is (888) 824-0200.
- Does Michael O'Connor accept Medicare?
- Michael O'Connor is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael O'Connor's NPI active?
- Yes — Michael O'Connor's NPI (1083731327) is active in the NPPES registry as of the last update on 2025-09-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.