Cara E. O'Brien
- Medicare patients, 2026
- 192
- Part D claims, 2026
- 383
- Hospital affiliations
- 2
- Industry payments
- $233
- Medical groups
- 3
- Practice address
- 5721 S Maryland Ave, Chicago, IL 60637
- Practice phone
- Call (773) 702-1530
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Comer Children's Hospital - Hyde Park
Chicago, Illinois
Find Cara O'Brien's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Cara E. O'Brien is a nurse practitioner in Chicago, Illinois
Cara O'Brien practices at Comer Children's Hospital - Hyde Park in Chicago, Illinois.
Cara O'Brien's NPI, 1992414437, was assigned on November 22, 2022. Cara O'Brien holds Illinois license 209.025998.
- NPI
- 1992414437NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1456721653
- NPI enumeration date
- November 22, 2022
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (773) 702-1530
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 30
- Medical school graduation
- 2022
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Cara E. O'Brien practices at Comer Children's Hospital - Hyde Park in Chicago, Illinois
Cara O'Brien's primary practice is Comer Children's Hospital - Hyde Park, at 5721 S Maryland Ave, Chicago, IL 60637 in Cook County. The practice phone is (773) 702-1530.
- Comer Children's Hospital - Hyde Park5721 S Maryland Ave, Chicago, IL 60637 · Cook CountyPhone(773) 702-1530
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Cara E. O'Brien is affiliated with 5 sites of care and 3 medical groups
Cara O'Brien's primary practice is Comer Children's Hospital - Hyde Park in Chicago, Illinois. Cara O'Brien is also affiliated with University of Chicago Medical Center. The medical group on file is UChicago Medicine Physicians. Dmand AI also links Cara O'Brien to 1 more hospital, 2 group practices and clinics and 2 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Cara E. O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Cara O'Brien practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Comer Children's Hospital - Hyde Park | Available with a free account |
| +4 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Cara E. O'Brien is one of 4,254 nurse practitioners in Illinois
Nurse practitioner is Cara O'Brien's primary specialty in the NPI Registry, under taxonomy code 363L00000X. Cara O'Brien is licensed in Illinois.
Specialties and state licenses
- Nurse practitioner, IllinoisPrimary
Nurse practitioners near Cara O'Brien
Counts of nurse practitioners 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
Cara E. O'Brien treated 192 Medicare patients in 2026, average age 76
CMS counts 192 Medicare patients who saw Cara O'Brien in 2026. The largest group is 75 to 84, with 77 patients. 75% of them have high blood pressure, and 74% have high cholesterol. 9% are also on Medicaid. Their average risk score is 2.06, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Cara O'Brien's median patient age at 73, with 62% women.
Cara O'Brien's Medicare patients by age, 2026
CMS leaves out age groups with fewer than 11 patients.
Cara O'Brien's Medicare patients by sex, 2026
- Women9851%
- Men9449%
Chronic conditions among Cara O'Brien's Medicare patients, 2026
- High blood pressure75%
- High cholesterol74%
- Arthritis56%
- Chronic kidney disease43%
- Diabetes40%
- Cancer39%
- Ischemic heart disease39%
- Heart failure31%
Share of Medicare patients with each condition. A patient can have several.
Cara O'Brien's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women62%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2026 data
Cara E. O'Brien wrote 383 Medicare Part D claims in 2026
In 2026, Cara O'Brien wrote 383 Medicare Part D claims for 90 patients. 77% of them were for generic drugs.
Cara O'Brien's Part D claims by kind of drug, 2026
- Generic295 claims77%
- Brand-name88 claims23%
Drug classes CMS tracks in Cara O'Brien's Part D claims, 2026
- Opioids16%60 of 383 claims
- Antibiotics4%14 of 383 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2026 data
Cara E. O'Brien offers telehealth to Medicare patients
Cara O'Brien accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Cara O'Brien as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Cara E. O'Brien received $233 in industry payments in 2025
CMS Open Payments shows 9 general payments to Cara O'Brien from 8 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $39.
Companies that paid Cara O'Brien the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Cara E. O'Brien'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | 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) |
| 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 Cara E. O'Brien
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Cara E. O'Brien's NPI number?
Cara E. O'Brien's NPI number is 1992414437. It was assigned on November 22, 2022, and it is active in the NPI Registry.
What does Cara E. O'Brien specialize in?
Cara E. O'Brien is a nurse practitioner in Chicago, Illinois. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does Cara E. O'Brien practice?
Cara O'Brien practices at 5721 S Maryland Ave, Chicago, IL 60637. Cara O'Brien's primary practice is Comer Children's Hospital - Hyde Park in Chicago, Illinois. Dmand AI also links Cara O'Brien to 1 hospital, 2 group practices and clinics and 2 medical groups, and a free account names each one.
What is Cara E. O'Brien's office phone number?
The practice phone on file for Cara O'Brien is (773) 702-1530. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Cara E. O'Brien's email address?
Dmand AI checks professional and personal email addresses for Cara O'Brien through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Cara E. O'Brien's medical license number?
Cara O'Brien holds Illinois license 209.025998.
Which hospitals is Cara E. O'Brien affiliated with?
Cara O'Brien is affiliated with University of Chicago Medical Center. Dmand AI links Cara O'Brien to 1 more hospital, named with a free account.
What medical group is Cara E. O'Brien part of?
Cara O'Brien is linked to UChicago Medicine Physicians. Dmand AI links Cara O'Brien to 2 more medical groups, named with a free account.
Who does Cara E. O'Brien practice with?
Dmand AI links 1,625 HCPs to Cara O'Brien's primary medical group, 58 of them nurse practitioners. A free account lists them, with verified contacts.
Does Cara E. O'Brien accept Medicare?
Yes. CMS lists Cara O'Brien as accepting Medicare assignment.
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Does Cara E. O'Brien offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Cara O'Brien as offering telehealth services.
How many Medicare patients does Cara E. O'Brien see?
CMS counts 192 Medicare patients who saw Cara O'Brien in 2026, with an average age of 76.
Has Cara E. O'Brien received payments from drug or device companies?
CMS Open Payments shows $233 in general payments to Cara O'Brien from 8 companies from 2025 to 2025. The largest total came from Pfizer Inc.
How long has Cara E. O'Brien been practicing?
Cara O'Brien graduated from medical school in 2022, 4 years ago.
What EHR does Cara E. O'Brien's practice use?
Dmand AI tracks the EHR system at Comer Children's Hospital - Hyde Park and at 4 more sites and 2 medical groups. The vendor and product are available with a free Dmand AI account.
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