Derek Altema
NPI 1023663671 · Emergency Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Derek Altema is a Emergency Medicine Physician provider in Los Angeles, CA (NPI 1023663671).
Provider details
- NPI number
- 1023663671
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 125.076264 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
6 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
118 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 56 | $178 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 35 | $177 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 27 | $122 |
Typical Medicare-allowed amounts for these services range $122–$178 (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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$167 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (3)
- 450 Broadway St # Mc6342Redwood City, CA 94063-3132Phone: (650) 721-1446
- 5841 S Maryland Ave # Mc5068Chicago, IL 60637-1443Phone: (773) 702-3820
- 1830 E Monument St Ste 6-100Baltimore, MD 21287-0020Phone: (443) 812-3628
Registry dates
- Enumerated
- 2019-08-09
- Last updated
- 2024-08-30
- Certified
- 2024-08-30
Frequently asked questions
- What is Derek Altema's NPI number?
- Derek Altema's National Provider Identifier (NPI) is 1023663671, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Derek Altema's specialty?
- Derek Altema is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Derek Altema located?
- Derek Altema's practice location on file with NPPES is 757 Westwood Plz Ste 1517, Los Angeles, CA 90095-3132.
- What is Derek Altema's phone number?
- The practice phone number listed in the NPPES registry for Derek Altema is (310) 825-9111.
- Does Derek Altema accept Medicare?
- Derek Altema is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Derek Altema's NPI active?
- Yes — Derek Altema's NPI (1023663671) is active in the NPPES registry as of the last update on 2024-08-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.