William N. May, M.D.
Ophthalmology Physician · Loma Linda, CA
William N. May, M.D. is an ophthalmology physician with a practice address in Loma Linda, California, and NPI 1700841046, issued on Apr 19, 2006. Check the license (California G56891, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William N. May
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- G56891 CA
18490 NV
Self-reported in NPPES; status is on the state search - Practice location
- 11370 Anderson St Ste 1800, Loma Linda, CA 92354
- Phone
- (909) 558-2154
- Enumerated
- Apr 19, 2006
- Record last updated
- Dec 19, 2024
- Medicaid ID
- 1700841046 NV
- Medicare enrollment
- Enrolled (PECOS I20090518000199); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 1984
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 11370 Anderson St Ste 1800
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Affeldt, MDOphthalmology Physician1275523375
- Marib AkandaOphthalmology Physician1336644558
- Kakarla Chalam, MDOphthalmology Physician1336112812
- Ritesh Gupta, MDOphthalmology Physician1114525383
- Eman HawyNeuro-ophthalmology Physician1871911917
- William Kiernan, ODOptometrist1174548291
Verify William N. May in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G56891Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
52% fewer Medicare Part D claims than the average ophthalmology physician in 2024
736 Medicare Part D claims for 212 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 55% of claims.
Most prescribed
- Latanoprost207 claims
- Erythromycin82 claims
- Restasis69 claims
- Dorzolamide-Timolol46 claims
- Prednisolone Acetate43 claims
- Lumigan40 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): 75.9 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: $952.96
19 payments; by number, the most common kind was food and beverage; the largest payer was Bausch & Lomb Americas Inc. The 13,221 providers of this specialty with any payment received $4,535.02 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
- Faculty Physicians And Surgeons OF LlusmLoma Linda, CA
- Sac Health SystemSan Bernardino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William N. May among 2,899 ophthalmology physician records in California
William N. May, M.D. is one of 2,899 ophthalmology 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 9% of them.
- NPI issued2006 · 9% of these records are older, 45% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1984 · median 2001 among the 1,907 with a school on file
- Record last updated2024 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
38 ophthalmology physician records list a practice address in Loma Linda
They are 38 of the 4,863 NPPES records with a practice address in Loma Linda, and 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Loma Linda → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- John Affeldt, MDLoma Linda, CA 923541275523375
- Larry Bowes, M.D.Loma Linda, CA 923541164454930
- Leslie Bruce-Lyle, M.D.Loma Linda, CA 923541316048382
- Kakarla Chalam, MDLoma Linda, CA 923541336112812
- William Clegg, M.D.Loma Linda, CA 923541790717403
- Howard Gimbel, M.D.Loma Linda, CA 923541578591921
- Garima Lal, MDLoma Linda, CA 923541285616490
- Harvey Lashier, M.D.Loma Linda, CA 923541528079258
Common questions
What is William N. May, M.D.'s NPI number?
William N. May, M.D.'s National Provider Identifier (NPI) is 1700841046, issued on Apr 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William N. May, M.D. located?
The NPPES record lists a practice address at 11370 Anderson St Ste 1800, Loma Linda, CA, 92354. Phone: (909) 558-2154. Providers update this record themselves, so call before visiting.
How can I verify William N. May, M.D.'s license?
NPPES lists California license number G56891, 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 N. May, M.D. prescribe under Medicare Part D?
In 2024, William N. May, M.D. had 736 Medicare Part D claims for 212 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is William N. May, M.D.'s MIPS final score?
The 2023 MIPS final score is 75.9 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.