Corey Warner, M.D.
Internal Medicine · Hidden Valley Lake, CA
At a glance
18990 Coyote Valley Rd Ste 10, Hidden Valley Lake, CA 95467-8339
NPPES record updated Jun 25, 2013. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
18990 Coyote Valley Rd Ste 10Hidden Valley Lake, CA 95467-8339
Education & affiliations
- Medical / professional school
- Oregon Health Sciences University School Of Medicine
- Graduation year
- 1997
- CMS specialties
- Internal Medicine
Practice groups
Reported hospital affiliations
- Adventist Health Clearlake Clearlake, CA
- Adventist Health St Helena Saint Helena, CA
- Adventist Health Ukiah Valley Ukiah, CA
- Sutter Lakeside Hospital Lakeport, CA
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Service-mix comparison is unavailable for this NPI in the imported Medicare service file.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $775.18 |
Reporting companies
| Company | Amount |
|---|---|
| NOVO NORDISK INC | $229.12 |
| ABBVIE INC. | $196.27 |
| NEUROCRINE BIOSCIENCES, INC. | $93.67 |
| LILLY USA, LLC | $63.77 |
| ASTRAZENECA PHARMACEUTICALS LP | $57.68 |
| BOEHRINGER INGELHEIM PHARMACEUTICALS, INC. | $49.47 |
| SALIX PHARMACEUTICALS, A DIVISION OF BAUSCH HEALTH US, LLC | $36.48 |
| PFIZER INC. | $25.50 |
| Other reporting companies | $23.22 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Internal Medicine
- Taxonomy code
- 207R00000X
- Enumeration date
- Sep 1, 2006
- Record updated
- Jun 25, 2013
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- M.D.
Reported taxonomies and licenses
207R00000X
License reported: 036103245 IL
207R00000X · Primary
License reported: C53422 CA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
18990 Coyote Valley Rd Ste 10Hidden Valley Lake, CA 95467-8339
- Phone
- (707) 987-8344
Mailing address
18990 COYOTE VALLEY RD STE 10HIDDEN VALLEY LAKE, CA 954678339
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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