Corey Warner, M.D.
NPI 1801998968 · Internal Medicine Physician · Hidden Valley Lake, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Corey Warner, M.D. is a Internal Medicine Physician provider in Hidden Valley Lake, CA (NPI 1801998968).
Provider details
- NPI number
- 1801998968
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036103245 (IL)
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 tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 173 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 755 | 162 |
| Levothyroxine Sodium | 697 | 141 |
| Olmesartan Medoxomil | 447 | 90 |
| Pantoprazole Sodium | 441 | 90 |
| Amlodipine Besylate | 381 | 86 |
| Meloxicam | 345 | 90 |
| Metformin Hcl | 323 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$428 across 22 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-01
- Last updated
- 2013-06-25
Frequently asked questions
- What is Corey Warner's NPI number?
- Corey Warner's National Provider Identifier (NPI) is 1801998968, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Corey Warner's specialty?
- Corey Warner is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Corey Warner located?
- Corey Warner's practice location on file with NPPES is 18990 Coyote Valley Rd Ste 10, Hidden Valley Lake, CA 95467-8339.
- What is Corey Warner's phone number?
- The practice phone number listed in the NPPES registry for Corey Warner is (707) 987-8344.
- Does Corey Warner accept Medicare?
- Corey Warner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Corey Warner's NPI active?
- Yes — Corey Warner's NPI (1801998968) is active in the NPPES registry as of the last update on 2013-06-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.