Corey Warner, M.D.
Internal Medicine Physician · Hidden Valley Lake, CA
Corey Warner, M.D. is an internal medicine physician with a practice address in Hidden Valley Lake, California, and NPI 1801998968, issued on Sep 1, 2006. Check the license (California C53422, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Corey Warner
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- C53422 CA
036103245 IL
Self-reported in NPPES; status is on the state search - Practice location
- 18990 Coyote Valley RD Ste 10, Hidden Valley Lake, CA 95467
- Phone
- (707) 987-8344
- Enumerated
- Sep 1, 2006
- Record last updated
- Jun 25, 2013 (not updated in 13 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Also registered at 18990 Coyote Valley RD Ste 10
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sean Parker, PA-CPhysician Assistant1497221832
- Theresa Schmitz, P.A.Medical Physician Assistant1205928579
Verify Corey Warner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C53422Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.9 times the Medicare Part D claims of the average internal medicine physician in 2024
12,334 Medicare Part D claims for 1,030 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 38 claims were for opioids.
Most prescribed
- Atorvastatin Calcium755 claims
- Levothyroxine Sodium697 claims
- Olmesartan Medoxomil447 claims
- Pantoprazole Sodium441 claims
- Amlodipine Besylate381 claims
- Meloxicam345 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 73.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $428.10
22 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
1 internal medicine physician records list a practice address in Hidden Valley Lake
They are 1 of the 12 NPPES records with a practice address in Hidden Valley Lake, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Hidden Valley Lake →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Corey Warner, M.D.'s NPI number?
Corey Warner, M.D.'s National Provider Identifier (NPI) is 1801998968, issued on Sep 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Corey Warner, M.D. located?
The NPPES record lists a practice address at 18990 Coyote Valley RD Ste 10, Hidden Valley Lake, CA, 95467. Phone: (707) 987-8344. Providers update this record themselves, so call before visiting.
How can I verify Corey Warner, M.D.'s license?
NPPES lists California license number C53422, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Corey Warner, M.D. prescribe under Medicare Part D?
In 2024, Corey Warner, M.D. had 12,334 Medicare Part D claims for 1,030 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Corey Warner, M.D.'s MIPS final score?
The 2023 MIPS final score is 73.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.