Michael Losak, MD
NPI 1891182184 · Emergency Medicine Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Losak, MD is a Emergency Medicine Physician provider in Stanford, CA (NPI 1891182184).
Provider details
- NPI number
- 1891182184
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A146293 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 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
249 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 150 | $187 |
| Critical Care, First 30-74 Minutes99291 | 38 | $233 |
| Ultrasound of Heart, Follow-Up93308 | 20 | $28 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 17 | $133 |
| Limited Ultrasound Scan Behind Abdominal Cavity76775 | 12 | $30 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 12 | $195 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-04-24
- Last updated
- 2024-03-23
- Certified
- 2024-03-23
Frequently asked questions
- What is Michael Losak's NPI number?
- Michael Losak's National Provider Identifier (NPI) is 1891182184, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Losak's specialty?
- Michael Losak is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Losak located?
- Michael Losak's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Michael Losak's phone number?
- The practice phone number listed in the NPPES registry for Michael Losak is (650) 723-4000.
- Does Michael Losak accept Medicare?
- Michael Losak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Losak's NPI active?
- Yes — Michael Losak's NPI (1891182184) is active in the NPPES registry as of the last update on 2024-03-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.