Ronald Charles May, M.D.
Ophthalmology Physician · Deerfield, IL
Ronald Charles May, M.D. is an ophthalmology physician with a practice address in Deerfield, Illinois, and NPI 1447250949, issued on Jul 26, 2005. Check the license (Illinois 036-040593, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Ronald Charles May
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- 036-040593 IL
036040593 IL
Self-reported in NPPES; status is on the state search - Practice location
- 740 Waukegan RD, Deerfield, IL 60015
- Phone
- (847) 945-6770
- Enumerated
- Jul 26, 2005
- Record last updated
- Sep 4, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (847) 945-3159
- Medicaid ID
- 036040593 IL
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 898 in Illinois → Look up another NPI →
Also registered at 740 Waukegan RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tamara Fountain, M.D.Ophthalmic Plastic and Reconstructive Surgery Physician1033110978
- Diany Morales, M.D.Ophthalmology Physician1124054937
- Matthew Plofsky, MDFamily Medicine Physician1104991231
- Mitchell Warren, M.D.Ophthalmology Physician1376543041
Verify Ronald Charles May in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-040593Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average ophthalmology physician in 2024
128 Medicare Part D claims for 45 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims.
Most prescribed
- Latanoprost54 claims
- Timolol Maleate26 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): 85 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).
Ronald Charles May among 898 ophthalmology physician records in Illinois
Ronald Charles May, M.D. is one of 898 ophthalmology physician records with a practice address in Illinois. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2018 · 60% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Illinois
There are 898 ophthalmology physician records in Illinois.
All 898 in Illinois → Every provider in Deerfield → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Diany Morales, M.D.Deerfield, IL 600151124054937
- Mitchell Warren, M.D.Deerfield, IL 600151376543041
- Leonard Bendikas, M.D.Des Plaines, IL 600161932118148
- Edward Dolezal, MDCrystal Lake, IL 600141821045782
- Ira Garoon, M.D.Des Plaines, IL 600161609994441
- Marshall Hirshman, MDDes Plaines, IL 600161003840133
- James Katz, MDDes Plaines, IL 600161477587509
- Richard Katz, MDDes Plaines, IL 600161841213725
Common questions
What is Ronald Charles May, M.D.'s NPI number?
Ronald Charles May, M.D.'s National Provider Identifier (NPI) is 1447250949, issued on Jul 26, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Charles May, M.D. located?
The NPPES record lists a practice address at 740 Waukegan RD, Deerfield, IL, 60015. Phone: (847) 945-6770. Providers update this record themselves, so call before visiting.
How can I verify Ronald Charles May, M.D.'s license?
NPPES lists Illinois license number 036-040593, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ronald Charles May, M.D. prescribe under Medicare Part D?
In 2024, Ronald Charles May, M.D. had 128 Medicare Part D claims for 45 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Ronald Charles May, M.D.'s MIPS final score?
The 2023 MIPS final score is 85 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.