Dr. Michelle Emiko Brennan, MD

  • Newport Beach, CA
  • Emergency medicine physician
NPI1255828323PAC ID7012394836
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
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Personal email
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Mobile number
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Social profiles

Primary practice

Hoag Hospital Newport Beach

Hospital · Newport Beach, California

See all 5 affiliations

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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 and contact details
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 BeachPrimary
    One Hoag Drive, Newport Beach, CA 92663 · Orange CountyPhone(949) 764-4624
  • Hoag Hospital Newport Beach
    1 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.

See all 5 affiliations for Dr. Brennan

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.

EHR by site
SiteEHR vendor and product
Hoag Hospital Newport BeachAvailable with a free account
+1 more site and 2 medical groupsAvailable 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, CaliforniaPrimaryLicense A174854 · 2021 to 2025 · taxonomy 207P00000X

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.

Medicare services, 20241,095
Medicare patients639
Paid by Medicare$100,570
Procedure codes4

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.

See all procedures by Dr. Brennan

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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.

Medicare patients, 2024639
Average age78
Average risk score2.22
Also on Medicaid20%

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

  1. High blood pressure75%
  2. High cholesterol75%
  3. Arthritis60%
  4. Ischemic heart disease44%
  5. Chronic kidney disease38%
  6. Atrial fibrillation37%
  7. Mood disorders37%
  8. 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.

Part D claims, 2024339
Drugs named by CMS7
Total drug cost$1,567
Part D patients220

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.

See all prescribing by Dr. Brennan

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.

See all payments to Dr. Brennan

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.

  1. Medical schoolThe University of Arizona College of Medicine, Phoenix
  2. Board certified in emergency medicineAmerican Board of 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

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare 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 percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand 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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