Dr. Michelle Emiko Brennan, MD
- Medicare services, 2024
- 1,095
- Medicare patients, 2024
- 639
- Part D claims, 2024
- 339
- MIPS score, 2024
- 100
- Hospital affiliations
- 2
- Practice address
- One Hoag Drive, Newport Beach, CA 92663
- Practice phone
- Call (949) 764-4624
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Brennan's professional email, personal email and mobile number
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Dr. Michelle Emiko Brennan is an emergency medicine physician in Newport Beach, California
Dr. Brennan practices at Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian.
Dr. Brennan's NPI, 1255828323, was assigned on April 15, 2018. Dr. Brennan graduated from The University of Arizona College of Medicine, Phoenix in 2018. Dr. Brennan's California license number on file is A174854.
- NPI
- 1255828323NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7012394836
- NPI enumeration date
- April 15, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (949) 764-4624
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michelle Emiko Brennan practices at 2 locations in Newport Beach, California
Dr. Brennan's primary practice is Hoag Hospital Newport Beach, at One Hoag Drive, Newport Beach, CA 92663 in Orange County. The practice phone is (949) 764-4624. Dr. Brennan also practices at Hoag Hospital Newport Beach, 1 Hoag Dr, Newport Beach, CA 92663.
- Hoag Hospital Newport BeachPrimaryOne Hoag Drive, Newport Beach, CA 92663 · Orange CountyPhone(949) 764-4624
- Hoag Hospital Newport Beach1 Hoag Dr, Newport Beach, CA 92663 · Orange CountyPhone(949) 764-4624
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Michelle Emiko Brennan is affiliated with 2 sites of care and 3 medical groups
Dr. Brennan's primary practice is Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian. Dr. Brennan is also affiliated with Ronald Reagan UCLA Medical Center. The medical group on file is Newport Emergency Medical Group. Dmand AI also links Dr. Brennan to 2 more medical groups, 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. Michelle Emiko Brennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Brennan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hoag Hospital Newport Beach | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michelle Emiko Brennan is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Brennan's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Brennan is board certified in emergency medicine by the American Board of Emergency Medicine. Dr. Brennan has a license on file in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Brennan
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. Michelle Emiko Brennan billed Medicare for 1,095 services in 2024
CMS data shows 1,095 Medicare services from Dr. Brennan across 4 procedure codes in 2024, for 639 Medicare patients. Medicare paid $100,570 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Brennan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6412024: 6684%
- Tests and treatments
- 2023: 4102024: 4274%
Dr. Brennan compared with the California median for emergency medicine physicians, 2024
- Dr. Brennan
- California median
- Medicare services
- 1,095vs 2654.1 times
- Medicare patients
- 639vs 2432.6 times
- Part D claims
- 180vs 622.9 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Brennan'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Brennan and other emergency medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michelle Emiko Brennan treated 639 Medicare patients in 2024, average age 78
CMS counts 639 Medicare patients who saw Dr. Brennan in 2024. The largest group is 75 to 84, with 246 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 20% are also on Medicaid. Their average risk score is 2.22, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Brennan's median patient age at 59, with 54% women.
Dr. Brennan's Medicare patients by age, 2024
Dr. Brennan's Medicare patients by sex, 2024
- Women35355%
- Men28645%
Chronic conditions among Dr. Brennan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis60%
- Ischemic heart disease44%
- Chronic kidney disease38%
- Atrial fibrillation37%
- Mood disorders37%
- Diabetes36%
Share of Medicare patients with each condition. A patient can have several.
Dr. Brennan'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
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Michelle Emiko Brennan wrote 339 Medicare Part D claims in 2024
In 2024, Dr. Brennan wrote 339 Medicare Part D claims for 220 patients. 95% of them were for generic drugs. CMS names the drug for 180 of them, across 7 drugs with 11 or more claims each, at $1,567 in total drug cost. In 2023, CMS named 109 claims across 6 drugs.
Dr. Brennan's Part D claims by kind of drug, 2024
- Generic322 claims95%
- Brand-name17 claims5%
Dr. Brennan'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. Brennan's Part D claims, 2024
- Opioids10%33 of 339 claims
- Antibiotics42%142 of 339 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: 1092024: 18065%
Drugs named by CMS: 7 in 2024, 6 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. Michelle Emiko Brennan scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Brennan for performance year 2024, reported as part of a group. Dr. Brennan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Brennan's MIPS scores, performance year 2024
- 100of 100Final score
- 96.4of 100Quality
- 40of 100Improvement Activities
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. Michelle Emiko Brennan received $24 in industry payments in 2023
CMS Open Payments shows 1 general payment to Dr. Brennan from 1 drug or device company in 2023. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $24.
Companies that paid Dr. Brennan the most, 2023 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michelle Emiko Brennan graduated from The University of Arizona College of Medicine, Phoenix
Dr. Brennan graduated from The University of Arizona College of Medicine, Phoenix in 2018.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Michelle Emiko Brennan accepts plans from 1 insurance carrier
Dr. Brennan is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Michelle Emiko Brennan'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 Affiliation DataDmand AI Practice 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 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) |
| 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. Michelle Emiko Brennan
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. Michelle Emiko Brennan's NPI number?
Dr. Michelle Emiko Brennan's NPI number is 1255828323. It was assigned on April 15, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Michelle Emiko Brennan?
Dr. Michelle Emiko Brennan is an emergency medicine physician in Newport Beach, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Michelle Emiko Brennan practice?
Dr. Brennan practices at One Hoag Drive, Newport Beach, CA 92663. Dr. Brennan also practices at 1 Hoag Dr, Newport Beach, CA 92663. Dr. Brennan's primary practice is Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian. Dmand AI also links Dr. Brennan to 2 medical groups.
What is Dr. Michelle Emiko Brennan's office phone number?
The practice phone on file for Dr. Brennan is (949) 764-4624.
What is Dr. Michelle Emiko Brennan's medical license number?
Dr. Brennan's California license number on file is A174854.
Which hospitals is Dr. Michelle Emiko Brennan affiliated with?
Dr. Brennan practices at Hoag Hospital Newport Beach in Newport Beach, California. Dr. Brennan is also affiliated with Ronald Reagan UCLA Medical Center.
What medical group is Dr. Michelle Emiko Brennan part of?
Dr. Brennan is linked to Newport Emergency Medical Group. Dmand AI links Dr. Brennan to 2 more medical groups.
Does Dr. Michelle Emiko Brennan accept Medicare?
Yes. CMS data shows Dr. Brennan billed Medicare for 1,095 services in 2024, and Dr. Brennan accepts Medicare assignment.
What is Dr. Michelle Emiko Brennan's MIPS score?
Dr. Brennan's MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
How many Medicare patients does Dr. Michelle Emiko Brennan see?
CMS counts 639 Medicare patients who saw Dr. Brennan in 2024, with an average age of 78.
Show 7 more questionsShow fewer questions
Is Dr. Michelle Emiko Brennan board certified?
Yes. Dr. Brennan is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Michelle Emiko Brennan bill to Medicare?
In 2024, Dr. Brennan's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and critical care (99291).
Where did Dr. Michelle Emiko Brennan go to medical school?
Dr. Brennan graduated from The University of Arizona College of Medicine, Phoenix in 2018.
What drugs does Dr. Michelle Emiko Brennan prescribe most?
In 2024 Medicare Part D data, Dr. Brennan's most prescribed drugs by claims were Cefdinir, Oxycodone HCl and Ondansetron ODT.
Has Dr. Michelle Emiko Brennan received payments from drug or device companies?
CMS Open Payments shows $24 in general payments to Dr. Brennan from 1 company from 2023 to 2023. The largest total came from Boston Scientific Corporation.
How long has Dr. Michelle Emiko Brennan been practicing?
Dr. Brennan graduated from medical school in 2018, 8 years ago.
What insurance does Dr. Michelle Emiko Brennan accept?
Dr. Brennan is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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