Brooke Harmssen, D.O.
NPI 1083110456 · Internal Medicine Physician · Glendale, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Brooke Harmssen, D.O. is a Internal Medicine Physician provider in Glendale, CA (NPI 1083110456).
Provider details
- NPI number
- 1083110456
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A17897 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
356 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 284 | $179 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 26 | $99 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 19 | $135 |
| Critical Care, First 30-74 Minutes99291 | 16 | $217 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 11 | $177 |
Typical Medicare-allowed amounts for these services range $99–$217 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-04-03
- Last updated
- 2022-11-21
- Certified
- 2022-11-21
Frequently asked questions
- What is Brooke Harmssen's NPI number?
- Brooke Harmssen's National Provider Identifier (NPI) is 1083110456, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Brooke Harmssen's specialty?
- Brooke Harmssen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Brooke Harmssen located?
- Brooke Harmssen's practice location on file with NPPES is 1650 East Chevy Chase Drive, Glendale, CA 91206-4159.
- What is Brooke Harmssen's phone number?
- The practice phone number listed in the NPPES registry for Brooke Harmssen is (747) 212-3441.
- Does Brooke Harmssen accept Medicare?
- Brooke Harmssen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Brooke Harmssen's NPI active?
- Yes — Brooke Harmssen's NPI (1083110456) is active in the NPPES registry as of the last update on 2022-11-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.