Dr. Brooke Harmssen, DO
- Medicare services, 2024
- 356
- Medicare patients, 2024
- 358
- Part D claims, 2024
- 29
- MIPS score, 2024
- 96
- Hospital affiliations
- 4
- Practice address
- 1509 E Wilson Terrace, Glendale, CA 91206
- Practice phone
- Call (818) 409-8202
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Harmssen'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. Brooke Harmssen is an internist in Glendale, California
Dr. Harmssen practices at Adventist Health Glendale in Glendale, California, part of Adventist Health.
Dr. Harmssen's NPI, 1083110456, was assigned on April 3, 2018. Dr. Harmssen graduated from Touro University California - Vallejo in 2018. Dr. Harmssen holds California license 20A17897.
- NPI
- 1083110456NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0042615502
- NPI enumeration date
- April 3, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (818) 409-8202
- 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. Brooke Harmssen practices at Adventist Health Glendale in Glendale, California
Dr. Harmssen's primary practice is Adventist Health Glendale, at 1509 E Wilson Terrace, Glendale, CA 91206 in Los Angeles County. The practice phone is (818) 409-8202.
- Adventist Health Glendale1509 E Wilson Terrace, Glendale, CA 91206 · Los Angeles CountyPhone(818) 409-8202
Source: Dmand AI Affiliation Data
Dr. Brooke Harmssen is affiliated with 4 sites of care and 2 medical groups
Dr. Harmssen's primary practice is Adventist Health Glendale in Glendale, California, part of Adventist Health. Dr. Harmssen is also affiliated with Kaiser Permanente Los Angeles Medical Center. The medical group on file is Vituity. Dmand AI also links Dr. Harmssen to 2 more hospitals 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. Brooke Harmssen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Harmssen practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Adventist Health Glendale | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Adventist Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Brooke Harmssen is one of 16,751 internists in California
Internal medicine is Dr. Harmssen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Harmssen is board certified in family medicine by the American Board of Family Medicine. Dr. Harmssen is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acute respiratory failure, anxiety, atrial fibrillation and flutter, bile duct problems, cellulitis, chronic anemia, dementia and electrolyte disorders among the conditions Dr. Harmssen treats.
Internists near Dr. Harmssen
Counts of internists 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. Brooke Harmssen billed Medicare for 356 services in 2024
CMS data shows 356 Medicare services from Dr. Harmssen across 5 procedure codes in 2024, for 358 Medicare patients. Medicare paid $48,502 for them.
Dr. Harmssen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2432024: 35647%
Where Dr. Harmssen's Medicare services took place, 2024
- In an office267%
- In a facility33093%
Dr. Harmssen compared with the California median for internists, 2024
- Dr. Harmssen
- California median
- Medicare services
- 356vs 361Close to median
- Medicare patients
- 358vs 1512.4 times
- Part D claims
- 90vs 42179% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Harmssen'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.
Need commercial claims for Dr. Harmssen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Harmssen and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Brooke Harmssen treated 358 Medicare patients in 2024, average age 76
CMS counts 358 Medicare patients who saw Dr. Harmssen in 2024. The largest group is 65 to 74, with 119 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 77% are also on Medicaid. Their average risk score is 2.64, 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. Harmssen's median patient age at 59, with 49% women.
Dr. Harmssen's Medicare patients by age, 2024
Dr. Harmssen's Medicare patients by sex, 2024
- Women20557%
- Men15343%
Chronic conditions among Dr. Harmssen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis72%
- Ischemic heart disease63%
- Diabetes62%
- Heart failure54%
- Mood disorders52%
- Chronic kidney disease50%
Share of Medicare patients with each condition. A patient can have several.
Dr. Harmssen'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
- Women49%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Brooke Harmssen wrote 29 Medicare Part D claims in 2024
In 2024, Dr. Harmssen wrote 29 Medicare Part D claims for 16 patients. 93% of them were for generic drugs. They cover 6 drugs, with $5,623 in total drug cost.
Dr. Harmssen's Part D claims by kind of drug, 2024
- Generic27 claims93%
- Brand-name and other2 claims7%
Dr. Harmssen's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
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. Brooke Harmssen scored 96 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 96 out of 100 for Dr. Harmssen for performance year 2024, reported through an alternative payment model (APM). Dr. Harmssen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Harmssen's MIPS scores, performance year 2024
- 96of 100Final score
- 81.5of 100Quality
- 100of 100Promoting Interoperability
- 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. Brooke Harmssen received $28 in industry payments in 2025
CMS Open Payments shows 2 general payments to Dr. Harmssen from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $28.
Companies that paid Dr. Harmssen the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Brooke Harmssen graduated from Touro University California - Vallejo
Dr. Harmssen graduated from Touro University California - Vallejo in 2018.
- Medical school
- Board certified in family medicine
Source: Dmand AI Professional Profile Data
Dr. Brooke Harmssen accepts plans from 6 insurance carriers
Dr. Harmssen is in network with 6 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Molina
- Regence Health Plans
- CMS Medicare
Plan types Dr. Harmssen accepts, by number of carriers
- Medicare6
- PPO4
- HMO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Brooke Harmssen'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 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. Brooke Harmssen
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. Brooke Harmssen's NPI number?
Dr. Brooke Harmssen's NPI number is 1083110456. It was assigned on April 3, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Brooke Harmssen?
Dr. Brooke Harmssen is an internist in Glendale, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Brooke Harmssen practice?
Dr. Harmssen practices at 1509 E Wilson Terrace, Glendale, CA 91206. Dr. Harmssen's primary practice is Adventist Health Glendale in Glendale, California, part of Adventist Health. Dmand AI also links Dr. Harmssen to 2 hospitals and 1 medical group.
What is Dr. Brooke Harmssen's office phone number?
The practice phone on file for Dr. Harmssen is (818) 409-8202.
What is Dr. Brooke Harmssen's medical license number?
Dr. Harmssen holds California license 20A17897.
Which hospitals is Dr. Brooke Harmssen affiliated with?
Dr. Harmssen practices at Adventist Health Glendale in Glendale, California. Dr. Harmssen is also affiliated with Kaiser Permanente Los Angeles Medical Center. Dmand AI links Dr. Harmssen to 2 more hospitals.
What medical group is Dr. Brooke Harmssen part of?
Dr. Harmssen is linked to Vituity. Dmand AI links Dr. Harmssen to 1 more medical group.
Does Dr. Brooke Harmssen accept Medicare?
Yes. CMS data shows Dr. Harmssen billed Medicare for 356 services in 2024, and Dr. Harmssen accepts Medicare assignment.
What is Dr. Brooke Harmssen's MIPS score?
Dr. Harmssen's MIPS final score for performance year 2024 is 96 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Brooke Harmssen see?
CMS counts 358 Medicare patients who saw Dr. Harmssen in 2024, with an average age of 76.
Show 7 more questionsShow fewer questions
Is Dr. Brooke Harmssen board certified?
Yes. Dr. Harmssen is board certified in family medicine by the American Board of Family Medicine.
What services does Dr. Brooke Harmssen bill to Medicare?
In 2024, Dr. Harmssen's most billed Medicare services were hospital inpatient care (99223), office visit, established patient (99213) and hospital inpatient care (99222).
Where did Dr. Brooke Harmssen go to medical school?
Dr. Harmssen graduated from Touro University California - Vallejo in 2018.
What drugs does Dr. Brooke Harmssen prescribe most?
In 2022 Medicare Part D data, Dr. Harmssen's most prescribed drugs by claims were Atorvastatin Calcium, Omeprazole and Carvedilol.
Has Dr. Brooke Harmssen received payments from drug or device companies?
CMS Open Payments shows $28 in general payments to Dr. Harmssen from 1 company from 2025 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Brooke Harmssen been practicing?
Dr. Harmssen graduated from medical school in 2018, 8 years ago.
What insurance does Dr. Brooke Harmssen accept?
Dr. Harmssen is in network with 6 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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