Dr. Gabrielle O'Connor, MD
- Medicare services, 2024
- 1,477
- Medicare patients, 2024
- 531
- Part D claims, 2024
- 5,163
- MIPS score, 2024
- 19
- Hospital affiliations
- 4
- Practice address
- 27700 Medical Center Rd, Mission Viejo, CA 92691
- Practice phone
- Call (949) 365-2447
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mission Hospital - Unit
Acute Care Hospital-Unit · Mission Viejo, California
Find Dr. O'Connor'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.
Dr. Gabrielle O'Connor is an endocrinologist in Mission Viejo, California
Dr. O'Connor practices at Mission Hospital - Unit in Mission Viejo, California.
Dr. O'Connor's NPI, 1720118961, was assigned on March 6, 2007. Dr. O'Connor graduated from University College of Dublin National Univ SOM in 1978. Dr. O'Connor holds California license A49115.
- NPI
- 1720118961NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4284661463
- NPI enumeration date
- March 6, 2007
- NPI status
- Active
- Offers telehealth
- Yes
- Practice phone
- (949) 365-2447
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 74
- Medical school graduation
- 1978
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gabrielle O'Connor practices at Mission Hospital - Unit in Mission Viejo, California
Dr. O'Connor's primary practice is Mission Hospital - Unit, at 27700 Medical Center Rd, Mission Viejo, CA 92691 in Orange County. The practice phone is (949) 365-2447.
- Mission Hospital - Unit27700 Medical Center Rd, Mission Viejo, CA 92691 · Orange CountyPhone(949) 365-2447
Source: Dmand AI Affiliation Data
Dr. Gabrielle O'Connor is affiliated with 5 sites of care and 1 medical group
Dr. O'Connor's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dr. O'Connor is also affiliated with Providence Mission Hospital. The medical group on file is Stanford Health Care. Dmand AI also links Dr. O'Connor to 2 more hospitals and 1 physician office, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gabrielle O'Connor's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Connor practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mission Hospital - Unit | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gabrielle O'Connor is one of 1,062 endocrinologists in California
Endocrinology, diabetes and metabolism is Dr. O'Connor's primary specialty in the NPI Registry, under taxonomy code 207RE0101X. Dr. O'Connor is board certified in endocrinology, diabetes and metabolism by the American Board of Internal Medicine. Dr. O'Connor is licensed in California.
Specialties and state licenses
- Endocrinology, diabetes and metabolism, CaliforniaPrimary
Clinical focus
Dmand AI lists acne, acute skin infection, adjustment disease, ankle or foot injury, anxiety, arthritis, atrial fibrillation and flutter and bronchitis among the conditions Dr. O'Connor treats.
Endocrinologists near Dr. O'Connor
Counts of endocrinologists 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. Gabrielle O'Connor billed Medicare for 1,477 services in 2024
CMS data shows 1,477 Medicare services from Dr. O'Connor across 6 procedure codes in 2024, for 531 Medicare patients. Medicare paid $143,291 for them. Every service was in an office.
Dr. O'Connor's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,5242024: 1,4058%
- Imaging
- 2023: 552024: 4813%
- Tests and treatments
- 2023: 272024: 2411%
- Lab and pathology
- 2023: 152024: 0100%
Dr. O'Connor compared with the California median for endocrinologists, 2024
- Dr. O'Connor
- California median
- Medicare services
- 1,477vs 6752.2 times
- Medicare patients
- 531vs 2402.2 times
- Part D claims
- 4,529vs 1,1044.1 times
Medians across 994 endocrinologists in California with Dmand AI profiles that report each measure.
Dr. O'Connor's most billed Medicare procedure codes, 2024
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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gabrielle O'Connor treated 531 Medicare patients in 2024, average age 75
CMS counts 531 Medicare patients who saw Dr. O'Connor in 2024. The largest group is 65 to 74, with 261 patients. 75% of them have high cholesterol, and 67% have high blood pressure. 2% are also on Medicaid. Their average risk score is 1.02, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. O'Connor's median patient age at 59, with 77% women.
Dr. O'Connor's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. O'Connor's Medicare patients by sex, 2024
- Women38573%
- Men14627%
Chronic conditions among Dr. O'Connor's Medicare patients, 2024
- High cholesterol75%
- High blood pressure67%
- Arthritis48%
- Diabetes35%
- Anxiety27%
- Osteoporosis25%
- Chronic kidney disease22%
- Cancer21%
Share of Medicare patients with each condition. A patient can have several.
Dr. O'Connor's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women77%
- Men21%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gabrielle O'Connor wrote 5,163 Medicare Part D claims in 2024
In 2024, Dr. O'Connor wrote 5,163 Medicare Part D claims for 575 patients. 76% of them were for generic drugs. CMS names the drug for 4,529 of them, across 77 drugs with 11 or more claims each, at $802,835 in total drug cost. In 2023, CMS named 4,430 claims across 80 drugs.
Dr. O'Connor's Part D claims by kind of drug, 2024
- Generic3,938 claims76%
- Brand-name1,155 claims22%
- Other70 claims1%
Dr. O'Connor'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. O'Connor's Part D claims, 2024
- Opioids1%41 of 5,163 claims
- Antibiotics1%66 of 5,163 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: 4,4302024: 4,5292%
Drugs named by CMS: 77 in 2024, 80 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
Dr. Gabrielle O'Connor scored 19 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 19 out of 100 for Dr. O'Connor for performance year 2024, reported individually. CMS lists Dr. O'Connor as offering telehealth.
- Offers telehealth
- Yes
Dr. O'Connor's MIPS scores, performance year 2024
- 19of 100Final score
- 0of 100Quality
- 0of 100Improvement Activities
- 65of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Gabrielle O'Connor received $926 in industry payments from 2016 to 2025
CMS Open Payments shows 56 general payments to Dr. O'Connor from 9 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 92% of the total. Abbvie Inc. paid the most, $606.
General payments to Dr. O'Connor by program year, 2016 to 2025
General payments to Dr. O'Connor by kind, 2016 to 2025
- Food and beverage$85092%
- Education$758%
Companies that paid Dr. O'Connor the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gabrielle O'Connor has 5 awards and honors on record
Dmand AI lists 5 awards for Dr. O'Connor, most recently Top Doctors:LA Area in 2013.
Awards and honors for Dr. O'Connor
- 2013
- Top Doctors:LA Area
- Top Doctors:San Diego Area
- 2006
- ACP Fellow
- Undated
- Checkbook Top Doc
- Compassionate Doctors
Source: Dmand AI Professional Profile Data
Dr. Gabrielle O'Connor graduated from University College of Dublin National Univ SOM
Dr. O'Connor graduated from University College of Dublin National Univ SOM in 1978. Dr. O'Connor is a member of ACP.
- Medical school
- Board certified in endocrinology, diabetes and metabolism
- Board certified in internal medicine
- Board certified in endocrinology diabetes and metabolism
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Gabrielle O'Connor accepts plans from 6 insurance carriers
Dr. O'Connor is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- CMS Medicare
Plan types Dr. O'Connor accepts, by number of carriers
- Medicare6
- PPO5
- HMO2
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gabrielle O'Connor'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 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Gabrielle O'Connor
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. Gabrielle O'Connor's NPI number?
Dr. Gabrielle O'Connor's NPI number is 1720118961. It was assigned on March 6, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Gabrielle O'Connor?
Dr. Gabrielle O'Connor is an endocrinologist in Mission Viejo, California. The primary specialty in the NPI Registry is Endocrinology, Diabetes & Metabolism Physician (taxonomy code 207RE0101X).
Where does Dr. Gabrielle O'Connor practice?
Dr. O'Connor practices at 27700 Medical Center Rd, Mission Viejo, CA 92691. Dr. O'Connor's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dmand AI also links Dr. O'Connor to 2 hospitals and 1 physician office.
What is Dr. Gabrielle O'Connor's office phone number?
The practice phone on file for Dr. O'Connor is (949) 365-2447.
What is Dr. Gabrielle O'Connor's medical license number?
Dr. O'Connor holds California license A49115.
Which hospitals is Dr. Gabrielle O'Connor affiliated with?
Dr. O'Connor is affiliated with Providence Mission Hospital. Dmand AI links Dr. O'Connor to 3 more hospitals.
What medical group is Dr. Gabrielle O'Connor part of?
Dr. O'Connor is linked to Stanford Health Care.
Does Dr. Gabrielle O'Connor accept Medicare?
Yes. CMS data shows Dr. O'Connor billed Medicare for 1,477 services in 2024.
Does Dr. Gabrielle O'Connor offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. O'Connor as offering telehealth services.
What is Dr. Gabrielle O'Connor's MIPS score?
Dr. O'Connor's MIPS final score for performance year 2024 is 19 out of 100, reported individually.
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How many Medicare patients does Dr. Gabrielle O'Connor see?
CMS counts 531 Medicare patients who saw Dr. O'Connor in 2024, with an average age of 75.
Is Dr. Gabrielle O'Connor board certified?
Yes. Dr. O'Connor is board certified in endocrinology, diabetes and metabolism by the American Board of Internal Medicine.
What services does Dr. Gabrielle O'Connor bill to Medicare?
In 2024, Dr. O'Connor's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99215) and office visit, established patient (99213).
Where did Dr. Gabrielle O'Connor go to medical school?
Dr. O'Connor graduated from University College of Dublin National Univ SOM in 1978.
What drugs does Dr. Gabrielle O'Connor prescribe most?
In 2024 Medicare Part D data, Dr. O'Connor's most prescribed drugs by claims were Levothyroxine Sodium, Rosuvastatin Calcium and Ozempic.
Has Dr. Gabrielle O'Connor received payments from drug or device companies?
CMS Open Payments shows $926 in general payments to Dr. O'Connor from 9 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Gabrielle O'Connor been practicing?
Dr. O'Connor graduated from medical school in 1978, 48 years ago.
What insurance does Dr. Gabrielle O'Connor accept?
Dr. O'Connor is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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