Warren Gee, MD
NPI 1528143575 · Anesthesiology Physician · Castro Valley, CA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Warren Gee, MD is a Anesthesiology Physician provider in Castro Valley, CA (NPI 1528143575).
Provider details
- NPI number
- 1528143575
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A97099 (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
108 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) |
|---|---|---|
| Anesthesia for Lens Surgery00142 | 54 | $136 |
| Anesthesia for Other Procedure on Eye00140 | 16 | $166 |
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 14 | $145 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 13 | $144 |
| Anesthesia for Extensive Surgery on Spine00670 | 11 | $507 |
Typical Medicare-allowed amounts for these services range $136–$507 (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
- 2006-10-26
- Last updated
- 2007-07-08
Frequently asked questions
- What is Warren Gee's NPI number?
- Warren Gee's National Provider Identifier (NPI) is 1528143575, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Warren Gee's specialty?
- Warren Gee is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Warren Gee located?
- Warren Gee's practice location on file with NPPES is 20103 Lake Chabot Rd, Castro Valley, CA 94546-5305.
- What is Warren Gee's phone number?
- The practice phone number listed in the NPPES registry for Warren Gee is (510) 537-1234.
- Does Warren Gee accept Medicare?
- Warren Gee is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Warren Gee's NPI active?
- Yes — Warren Gee's NPI (1528143575) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.