Christopher Lemaster, MD
NPI 1366563835 · Emergency Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Lemaster, MD is a Emergency Medicine Physician provider in Oakland, CA (NPI 1366563835).
Provider details
- NPI number
- 1366563835
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A111737 (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
19 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
17 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 | 17 | $184 |
Typical Medicare-allowed amounts for these services range $184–$184 (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
- 2007-04-03
- Last updated
- 2021-12-14
Frequently asked questions
- What is Christopher Lemaster's NPI number?
- Christopher Lemaster's National Provider Identifier (NPI) is 1366563835, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Lemaster's specialty?
- Christopher Lemaster is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Lemaster located?
- Christopher Lemaster's practice location on file with NPPES is 275 W Macarthur Blvd, Oakland, CA 94611-5641.
- What is Christopher Lemaster's phone number?
- The practice phone number listed in the NPPES registry for Christopher Lemaster is (510) 752-1000.
- Does Christopher Lemaster accept Medicare?
- Christopher Lemaster is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Lemaster's NPI active?
- Yes — Christopher Lemaster's NPI (1366563835) is active in the NPPES registry as of the last update on 2021-12-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.