Warren C. Howard, MD
Infectious Disease Physician · Riverside, CA
Warren C. Howard, MD is an infectious disease physician with a practice address in Riverside, California, and NPI 1063589885, issued on Nov 29, 2006. Check the license (California A62357, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Warren C. Howard
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- A62357 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10800 Magnolia Ave, Riverside, CA 92505
- Phone
- (909) 353-2000
- Enumerated
- Nov 29, 2006
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 10800 Magnolia Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kimberly Adams, PA-CMedical Physician Assistant1053522870
- Alfredo Aguiar, PAPhysician Assistant1043368970
- Michael Aguinaldo, M.D.Pediatrics Physician1851531487
- Maria Aguirre, MDPediatrics Physician1295806255
Verify Warren C. Howard in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A62357Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average infectious disease physician in 2024
225 Medicare Part D claims for 54 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Rifampin18 claims
- Amoxicillin16 claims
- Ritonavir13 claims
- Fluconazole12 claims
- Methenamine Hippurate12 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.
Warren C. Howard among 1,119 infectious disease physician records in California
Warren C. Howard, MD is one of 1,119 infectious disease physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 54% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Riverside → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Adam Baghban, MDRiverside, CA 925051790050144
- Khin Wong, MDRiverside, CA 925051225105042
- Steven Larson, MDRiverside, CA 925061790766160
- Sudhakar Mallela, M.D.Riverside, CA 925061851498729
- Jon Persichino, D.O.Riverside, CA 925061619905189
- Mohsen Aljayeh, MDRiverside, CA 925011770785859
- Arunmozhi Aravagiri-Do, MDMoreno Valley, CA 925551750888095
- Made Sutjita, M.D.Moreno Valley, CA 925551053428334
Common questions
What is Warren C. Howard, MD's NPI number?
Warren C. Howard, MD's National Provider Identifier (NPI) is 1063589885, issued on Nov 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Warren C. Howard, MD located?
The NPPES record lists a practice address at 10800 Magnolia Ave, Riverside, CA, 92505. Phone: (909) 353-2000. Providers update this record themselves, so call before visiting.
How can I verify Warren C. Howard, MD's license?
NPPES lists California license number A62357, 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 Warren C. Howard, MD prescribe under Medicare Part D?
In 2024, Warren C. Howard, MD had 225 Medicare Part D claims for 54 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
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.