Gregory C. Warner, M.D.
Critical Care Medicine (Internal Medicine) Physician · Visalia, CA
Gregory C. Warner, M.D. is a critical care medicine (internal medicine) physician with a practice address in Visalia, California, and NPI 1699810689, issued on Feb 20, 2007. Check the license (California G55305, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory C. Warner
- Credential
- M.D.
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- G55305 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5400 W Hillsdale Ave, Visalia, CA 93291
- Phone
- (559) 738-7511
- Enumerated
- Feb 20, 2007
- Record last updated
- Oct 23, 2024
- Fax
- (559) 739-2007
- Medicare enrollment
- Enrolled (PECOS I20080527000248); accepts Medicare assignment
- Medical or professional school
- University Of Nebraska College Of Medicine, 1980
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 723 in California → Look up another NPI →
Also registered at 5400 W Hillsdale Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kristal Calloway, AUDIOLOGISTAudiologist1194999557
- Joseph Chidi, M.D.Urology Physician1366448318
Verify Gregory C. Warner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G55305Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% more Medicare Part D claims than the average critical care medicine (internal medicine) physician in 2024
859 Medicare Part D claims for 190 beneficiaries, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D. Brand-name drugs were 62% of claims.
Most prescribed
- Trelegy Ellipta292 claims
- Montelukast Sodium98 claims
- Albuterol Sulfate Hfa97 claims
- Azithromycin55 claims
- Ofev54 claims
- Breo Ellipta45 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): 72.7 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: $1,033.79
33 payments; by number, the most common kind was food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. The 2,708 providers of this specialty with any payment received $2,958.68 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.
Bills Medicare through 2 group practices
- Adventist Health Physicians NetworkHanford, CA
- Saint Agnes Medical FoundationFresno, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory C. Warner among 723 critical care medicine (internal medicine) physician records in California
Gregory C. Warner, M.D. is one of 723 critical care medicine (internal medicine) physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 46% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1980 · median 2005 among the 559 with a school on file
- Record last updated2024 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in California
There are 723 critical care medicine (internal medicine) physician records in California.
All 723 in California → Every provider in Visalia → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Hazem Albashash, MDVisalia, CA 932911053940742
- David Hess, MDVisalia, CA 932911033146469
- Ayham Aboeed, M.D.Bakersfield, CA 933061093969750
- Bachar Botrus, MDBakersfield, CA 933091497374680
- Igor Garcia-Pacheco, M.D.Bakersfield, CA 933091770635690
- Samantha Mongar, DOLake Isabella, CA 932401235115015
- Barry Feldman, MDSanta Maria, CA 934541083672653
- Robert Hinds, D.O.Santa Maria, CA 934541619072964
Common questions
What is Gregory C. Warner, M.D.'s NPI number?
Gregory C. Warner, M.D.'s National Provider Identifier (NPI) is 1699810689, issued on Feb 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gregory C. Warner, M.D. located?
The NPPES record lists a practice address at 5400 W Hillsdale Ave, Visalia, CA, 93291. Phone: (559) 738-7511. Providers update this record themselves, so call before visiting.
How can I verify Gregory C. Warner, M.D.'s license?
NPPES lists California license number G55305, 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 Gregory C. Warner, M.D. prescribe under Medicare Part D?
In 2024, Gregory C. Warner, M.D. had 859 Medicare Part D claims for 190 beneficiaries; the average among critical care medicine (internal medicine) physician prescribers was 696. Part D covers Medicare prescriptions only.
What is Gregory C. Warner, M.D.'s MIPS final score?
The 2023 MIPS final score is 72.7 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.