Gregory Brewster, M.D.
NPI 1639164007 · Emergency Medicine Physician · Manhattan Beach, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Brewster, M.D. is a Emergency Medicine Physician provider in Manhattan Beach, CA (NPI 1639164007).
Provider details
- NPI number
- 1639164007
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A61173 (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
20 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
285 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 108 | $9 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 78 | $187 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 60 | $129 |
| Critical Care, First 30-74 Minutes99291 | 39 | $231 |
Typical Medicare-allowed amounts for these services range $9–$231 (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
- 2005-09-13
- Last updated
- 2012-08-13
Frequently asked questions
- What is Gregory Brewster's NPI number?
- Gregory Brewster's National Provider Identifier (NPI) is 1639164007, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Brewster's specialty?
- Gregory Brewster is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Brewster located?
- Gregory Brewster's practice location on file with NPPES is 111 N Sepulveda Blvd Ste 210, Manhattan Beach, CA 90266-6849.
- What is Gregory Brewster's phone number?
- The practice phone number listed in the NPPES registry for Gregory Brewster is (310) 379-2134.
- Does Gregory Brewster accept Medicare?
- Gregory Brewster is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Brewster's NPI active?
- Yes — Gregory Brewster's NPI (1639164007) is active in the NPPES registry as of the last update on 2012-08-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.