Grant Wei-Siang Su, M.D.
Ophthalmology Physician · Springfield, IL
Grant Wei-Siang Su, M.D. is an ophthalmology physician with a practice address in Springfield, Illinois, and NPI 1386723781, issued on Nov 4, 2006. Check the license (Illinois 036117645, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Grant Wei-Siang Su
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 036117645 IL
Self-reported in NPPES; status is on the state search - Practice location
- 301 N 8TH St, Springfield, IL 62701
- Phone
- (217) 528-7541
- Enumerated
- Nov 4, 2006
- Record last updated
- May 19, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 036117645 IL
- Medicare enrollment
- Enrolled (PECOS I20070813000732); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 898 in Illinois → Look up another NPI →
Also registered at 301 N 8TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Grant Wei-Siang Su 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 036117645Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average ophthalmology physician in 2024
938 Medicare Part D claims for 614 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Erythromycin612 claims
- Neomycin-Polymyxin-Dexameth139 claims
- Doxycycline Hyclate69 claims
- Tobramycin-Dexamethasone39 claims
- Amoxicillin-Clavulanate Potass22 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $68.48
3 payments; by number, the most common kind was food and beverage; the largest payer was Amgen 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 one group practice
- Springfield Clinic, LLPSpringfield, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Grant Wei-Siang Su among 898 ophthalmology physician records in Illinois
Grant Wei-Siang Su, 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 2006, is newer than 16% of them.
- NPI issued2006 · 16% of these records are older, 44% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2001 · median 1999 among the 551 with a school on file
- Record last updated2020 · 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 Springfield → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Ashley Abraham, M.D.Springfield, IL 627021285900423
- Ramanath Bhandari, MDSpringfield, IL 627031255594248
- Phyllis Eze, M.DSpringfield, IL 627031609063106
- Stephen Holland, M.D.Springfield, IL 627031508205147
- Aleksandr Kagan, D.O.Springfield, IL 627031598728453
- David Krah, M.D.Springfield, IL 627031225136567
- John Kwedar, M.D.Springfield, IL 627031972601243
- Eric Lohse, M.D.Springfield, IL 627031720186711
Common questions
What is Grant Wei-Siang Su, M.D.'s NPI number?
Grant Wei-Siang Su, M.D.'s National Provider Identifier (NPI) is 1386723781, issued on Nov 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Grant Wei-Siang Su, M.D. located?
The NPPES record lists a practice address at 301 N 8TH St, Springfield, IL, 62701. Phone: (217) 528-7541. Providers update this record themselves, so call before visiting.
How can I verify Grant Wei-Siang Su, M.D.'s license?
NPPES lists Illinois license number 036117645, 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 Grant Wei-Siang Su, M.D. prescribe under Medicare Part D?
In 2024, Grant Wei-Siang Su, M.D. had 938 Medicare Part D claims for 614 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Grant Wei-Siang Su, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.