Dr. Marie T. Oconnor Parker, MD
- Medicare services, 2023
- 131
- Part D claims, 2024
- 440
- Hospital affiliations
- 2
- Industry payments
- $31
- Medical groups
- 2
- Practice address
- 3815 Highland Avenue, Downers Grove, IL 60515
- Practice phone
- Call (630) 275-5900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Oconnor Parker's professional email, personal email and mobile number
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Dr. Marie T. Oconnor Parker is an emergency medicine physician in Downers Grove, Illinois
Dr. Oconnor Parker practices at Advocate Good Samaritan Hospital in Downers Grove, Illinois, part of Advocate Health.
Dr. Oconnor Parker's NPI, 1528035789, was assigned on March 7, 2006. Dr. Oconnor Parker graduated from Loyola University of Chicago, Stritch School of Medicine in 1999. Dr. Oconnor Parker holds Illinois license 036106251.
- NPI
- 1528035789NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8325024052
- NPI enumeration date
- March 7, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (630) 275-5900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marie T. Oconnor Parker practices at Advocate Good Samaritan Hospital in Downers Grove, Illinois
Dr. Oconnor Parker's primary practice is Advocate Good Samaritan Hospital, at 3815 Highland Avenue, Downers Grove, IL 60515 in Du Page County. The practice phone is (630) 275-5900.
- Advocate Good Samaritan Hospital3815 Highland Avenue, Downers Grove, IL 60515 · Du Page CountyPhone(630) 275-5900
Source: Dmand AI Affiliation Data
Dr. Marie T. Oconnor Parker is affiliated with 3 sites of care and 2 medical groups
Dr. Oconnor Parker's primary practice is Advocate Good Samaritan Hospital in Downers Grove, Illinois, part of Advocate Health. Dr. Oconnor Parker is also affiliated with Northwestern Medicine Central DuPage Hospital. The medical group on file is Northwestern Medical Faculty Foundation. Dmand AI also links Dr. Oconnor Parker to 1 more group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Marie T. Oconnor Parker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Oconnor Parker practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Advocate Good Samaritan Hospital | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marie T. Oconnor Parker is one of 2,385 emergency medicine physicians in Illinois
Emergency medicine is Dr. Oconnor Parker's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dmand AI has Dr. Oconnor Parker's licenses on file in 2 states: Illinois and Minnesota.
Specialties and state licenses
- Emergency medicine, IllinoisPrimary
- Minnesota license
Emergency medicine physicians near Dr. Oconnor Parker
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marie T. Oconnor Parker billed Medicare for 131 services in 2023
CMS data shows 131 Medicare services from Dr. Oconnor Parker across 4 procedure codes in 2023, all of them office visits. Medicare paid $12,276 for them. Every service was in an office.
Dr. Oconnor Parker's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 3522023: 13163%
Dr. Oconnor Parker compared with the Illinois median for emergency medicine physicians, 2023
- Dr. Oconnor Parker
- Illinois median
- Medicare services
- 131vs 27452% below
- Part D claims
- 233vs 455.2 times
Medians across 2,281 emergency medicine physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Oconnor Parker's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Oconnor Parker and other emergency medicine physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marie T. Oconnor Parker's patients have a median age of 43
Across all payers, Dmand AI patient panel data puts Dr. Oconnor Parker's median patient age at 43, with 56% women.
Dr. Oconnor Parker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 43
Patient panel by sex, all payers
- Women56%
- Men44%
Source: Dmand AI Patient Panel Data
Dr. Marie T. Oconnor Parker wrote 440 Medicare Part D claims in 2024
In 2024, Dr. Oconnor Parker wrote 440 Medicare Part D claims for 51 patients. 85% of them were for generic drugs. CMS names the drug for 233 of them, across 12 drugs with 11 or more claims each, at $31,320 in total drug cost. In 2023, CMS named 101 claims across 7 drugs.
Dr. Oconnor Parker's Part D claims by kind of drug, 2024
- Generic372 claims85%
- Brand-name68 claims15%
Dr. Oconnor Parker's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Oconnor Parker's Part D claims, 2024
- Opioids4%16 of 440 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1012024: 233131%
Drugs named by CMS: 12 in 2024, 7 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Marie T. Oconnor Parker takes part in Medicare
Dr. Oconnor Parker accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Marie T. Oconnor Parker received $31 in industry payments from 2018 to 2025
CMS Open Payments shows 2 general payments to Dr. Oconnor Parker from 2 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $17.
General payments to Dr. Oconnor Parker by program year, 2018 to 2025
Companies that paid Dr. Oconnor Parker the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Marie T. Oconnor Parker graduated from Loyola University of Chicago, Stritch School of Medicine
Dr. Oconnor Parker graduated from Loyola University of Chicago, Stritch School of Medicine in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Marie T. Oconnor Parker's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marie T. Oconnor Parker
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marie T. Oconnor Parker's NPI number?
Dr. Marie T. Oconnor Parker's NPI number is 1528035789. It was assigned on March 7, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Marie T. Oconnor Parker?
Dr. Marie T. Oconnor Parker is an emergency medicine physician in Downers Grove, Illinois. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Marie T. Oconnor Parker practice?
Dr. Oconnor Parker practices at 3815 Highland Avenue, Downers Grove, IL 60515. Dr. Oconnor Parker's primary practice is Advocate Good Samaritan Hospital in Downers Grove, Illinois, part of Advocate Health. Dmand AI also links Dr. Oconnor Parker to 1 group practice or clinic and 1 medical group.
What is Dr. Marie T. Oconnor Parker's office phone number?
The practice phone on file for Dr. Oconnor Parker is (630) 275-5900.
What is Dr. Marie T. Oconnor Parker's medical license number?
Dr. Oconnor Parker holds Illinois license 036106251, one of the licenses on file in 2 states.
Which states has Dr. Marie T. Oconnor Parker been licensed in?
Dmand AI has state licenses on file for Dr. Oconnor Parker in Illinois and Minnesota.
Which hospitals is Dr. Marie T. Oconnor Parker affiliated with?
Dr. Oconnor Parker practices at Advocate Good Samaritan Hospital in Downers Grove, Illinois. Dr. Oconnor Parker is also affiliated with Northwestern Medicine Central DuPage Hospital.
What medical group is Dr. Marie T. Oconnor Parker part of?
Dr. Oconnor Parker is linked to Northwestern Medical Faculty Foundation. Dmand AI links Dr. Oconnor Parker to 1 more medical group.
Does Dr. Marie T. Oconnor Parker accept Medicare?
Yes. CMS data shows Dr. Oconnor Parker billed Medicare for 131 services in 2023, and Dr. Oconnor Parker accepts Medicare assignment.
What services does Dr. Marie T. Oconnor Parker bill to Medicare?
In 2023, Dr. Oconnor Parker's most billed Medicare services were office visit, established patient (99214), office visit, new patient (99204) and office visit, established patient (99213).
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Where did Dr. Marie T. Oconnor Parker go to medical school?
Dr. Oconnor Parker graduated from Loyola University of Chicago, Stritch School of Medicine in 1999.
What drugs does Dr. Marie T. Oconnor Parker prescribe most?
In 2024 Medicare Part D data, Dr. Oconnor Parker's most prescribed drugs by claims were Atorvastatin Calcium, Metformin HCl and Mounjaro.
Has Dr. Marie T. Oconnor Parker received payments from drug or device companies?
CMS Open Payments shows $31 in general payments to Dr. Oconnor Parker from 2 companies from 2018 to 2025. The largest total came from Exact Sciences Corporation.
How long has Dr. Marie T. Oconnor Parker been practicing?
Dr. Oconnor Parker graduated from medical school in 1999, 27 years ago.
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