William G. Harris, MD
Allergy & Immunology Physician · Orange, CA
William G. Harris, MD is an allergy & immunology physician with a practice address in Orange, California, and NPI 1922065788, issued on Apr 27, 2006. Check the license (California G64493, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William G. Harris
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- G64493 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1140 W LA Veta Ave Ste 850, Orange, CA 92868
- Phone
- (714) 771-7994
- Enumerated
- Apr 27, 2006
- Record last updated
- Dec 14, 2023
- Fax
- (714) 744-4167
- Medicaid ID
- 00G64493 CA
- Medicare enrollment
- Enrolled (PECOS I20040421000651); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Also registered at 1140 W LA Veta Ave Ste 850
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Yela Jung, MDAllergy & Immunology Physician1780145573
- Chao-I Lin, MDAllergy & Immunology Physician1588779631
- Tiffany Wu, M.D.Surgery Physician1629353933
Verify William G. Harris in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G64493Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% more Medicare Part D claims than the average allergy & immunology physician in 2024
1,151 Medicare Part D claims for 205 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Azelastine Hcl148 claims
- Levocetirizine Dihydrochloride136 claims
- Albuterol Sulfate Hfa97 claims
- Fluticasone Propionate66 claims
- Montelukast Sodium53 claims
- Prednisone39 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.
Industry payments in 2024: $2,246.61
97 payments; by number, the most common kind was food and beverage; the largest payer was Leo Pharma Inc. The 2,496 providers of this specialty with any payment received $8,321.81 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 one group practice
- Allergy Partners OF California IncIrvine, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William G. Harris among 444 allergy & immunology physician records in California
William G. Harris, MD is one of 444 allergy & immunology 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 7% of them.
- NPI issued2006 · 7% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1987 · median 2004 among the 281 with a school on file
- Record last updated2023 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in California
There are 444 allergy & immunology physician records in California.
All 444 in California → Every provider in Orange → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Wan-Yin Chan, M.D.Orange, CA 928681932391471
- Stanley Galant, MDOrange, CA 928681780799809
- Yela Jung, MDOrange, CA 928681780145573
- Donald Levy, MDOrange, CA 928681518055011
- Chao-I Lin, MDOrange, CA 928681588779631
- Diem-Tran Nguyen, MDOrange, CA 928681215498761
- Jason WongOrange, CA 928681376170449
- Alan Gorenberg, MDOrange, CA 928691730115221
Common questions
What is William G. Harris, MD's NPI number?
William G. Harris, MD's National Provider Identifier (NPI) is 1922065788, issued on Apr 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William G. Harris, MD located?
The NPPES record lists a practice address at 1140 W LA Veta Ave Ste 850, Orange, CA, 92868. Phone: (714) 771-7994. Providers update this record themselves, so call before visiting.
How can I verify William G. Harris, MD's license?
NPPES lists California license number G64493, 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 William G. Harris, MD prescribe under Medicare Part D?
In 2024, William G. Harris, MD had 1,151 Medicare Part D claims for 205 beneficiaries; the average among allergy & immunology physician prescribers was 741. 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.