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DR. BROOKE HARMSSEN D.O.
NPI 1083110456
Internal Medicine in Glendale, CA

Active since April 03, 2018PECOS EnrolledAccepts Medicare Assignment
1650 EAST CHEVY CHASE DRIVE, SUITE 355, GLENDALE, CA 91206(747) 212-3441(747) 273-0965 Get Directions Write a Review

NPPES record last updated: November 21, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Nov 21, 2022, Sep 21, 2022, Sep 13, 2022 (3 updates tracked since 2022).

About Dr. Brooke Harmssen D.o. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. BROOKE HARMSSEN D.O. (NPI 1083110456) is an individual internal medicine provider in Glendale, California, licensed in California (20A17897) and active in the NPI registry since April 2018. She is enrolled in Medicare PECOS and is a graduate of Touro Un College Of Osteopathic Medicine, Vallejo (2018).

NPPES Registry Identity

NPI1083110456
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. BROOKE HARMSSENCredential: D.O.
Location Address1650 EAST CHEVY CHASE DRIVE, SUITE 355Glendale, CA 91206-4159
Mailing Address1650 East Chevy Chase Drive, Suite 355Glendale, CA 91206-4159 · (747) 212-3441 · Fax (747) 273-0965
Phone(747) 212-3441
Fax(747) 273-0965
Sole ProprietorYes
Medical School CMSTouro Un College Of Osteopathic Medicine, VallejoGraduated 2018
Enumeration DateApril 3, 2018
Last NPPES UpdateNovember 21, 20223 updates tracked since enumeration
NPPES CertifiedNovember 21, 2022
✔ NPI 1083110456 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · 20A17897
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedFamily MedicineTaxonomy 207Q00000X · License A17897 (CA)
1650 EAST CHEVY CHASE DRIVE, Glendale, CA 91206
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Brooke Harmssen D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID42615502
PECOS Enrollment IDI20220909003099
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Brooke Harmssen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Glendale Adventist Emergency Physicians Incorporated
0.1 mi
Emergency Medicine
1509 WILSON TER, EMERGENCY DEPARTMENT
Glendale, CA 91206
  • Reassigned Medicare billing, California enrollment
  • 49 clinicians in this Medicare group
NPI 1679907869 (818) 863-4000
Galen Inpatient Physicians, PC
0.2 mi
Hospitalist
1509 WILSON TER
Glendale, CA 91206
  • Reassigned Medicare billing, California enrollment
  • 962 clinicians in this Medicare group
NPI 1568137008 (818) 409-8000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 5

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
284 services271 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
26 services21 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
19 services19 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
16 services16 patients
Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91206 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Brooke Harmssen's NPI number?

The NPI number for Brooke Harmssen is 1083110456. It was assigned to this individual provider in the NPPES registry on April 3, 2018.

Where is Brooke Harmssen located?

Brooke Harmssen practices at 1650 East Chevy Chase Drive Suite 355, Glendale, CA 91206. The listed phone number is (747) 212-3441.

What is Brooke Harmssen's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Brooke Harmssen enrolled in Medicare?

Yes. Brooke Harmssen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Brooke Harmssen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Brooke Harmssen reassigns Medicare benefits to 2 organizations: Glendale Adventist Emergency Physicians Incorporated (Glendale, CA) and Galen Inpatient Physicians, PC (Glendale, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Brooke Harmssen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Brooke Harmssen was last updated on November 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.