Warren Jeffrey Chang, M.D.
Ophthalmology Physician · Bloomington, IN
Warren Jeffrey Chang, M.D. is an ophthalmology physician with a practice address in Bloomington, Indiana, and NPI 1902888662, issued on Nov 17, 2005. Check the license (Indiana IN01052241, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Warren Jeffrey Chang
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- IN01052241 IN
Self-reported in NPPES; status is on the state search - Practice location
- 1011 W 2ND St, Bloomington, IN 47403
- Phone
- (812) 334-1213
- Enumerated
- Nov 17, 2005
- Record last updated
- Feb 14, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (812) 333-5039
- Medicaid ID
- 200257620A IN
- Medicare enrollment
- Enrolled (PECOS I20111212000141); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 1992
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 311 in Indiana → Look up another NPI →
Also registered at 1011 W 2ND St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jason Gray, O.D.Optometrist1730387283
- Rex Grossman, M.D.Ophthalmology Physician1306828322
- Steven Holbrook, O.D.Optometrist1285616276
- Andrew Huck, MD, MSOphthalmology Physician1346770005
- Charles Huck, O.D.Optometrist1346222320
Verify Warren Jeffrey Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license IN01052241Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,364 Medicare Part D claims for 445 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims. 54 claims were for opioids.
Most prescribed
- Erythromycin272 claims
- Latanoprost224 claims
- Timolol Maleate135 claims
- Tobramycin-Dexamethasone92 claims
- Brimonidine Tartrate74 claims
- Lumigan66 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): 95.1 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: $777.48
27 payments; by number, the most common kind was food and beverage; the largest payer was Regeneron Healthcare Solutions, 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
- Integ Health System PCBloomington, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Warren Jeffrey Chang among 311 ophthalmology physician records in Indiana
Warren Jeffrey Chang, M.D. is one of 311 ophthalmology physician records with a practice address in Indiana. 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, 70% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1992 · median 2000 among the 197 with a school on file
- Record last updated2012 · 61% 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 Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Indiana
There are 311 ophthalmology physician records in Indiana.
All 311 in Indiana → Every provider in Bloomington → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Matthew Fornefeld, M.D.Bloomington, IN 474031881676807
- Rex Grossman, M.D.Bloomington, IN 474031306828322
- Andrew Huck, MD, MSBloomington, IN 474031346770005
- Joseph Mackey, M.D.Bloomington, IN 474031114124575
- Drew Davis, M.D.Bedford, IN 474211891086989
- Marc Jones, M.D.Bedford, IN 474211013951292
- Bryan Hainline, M.D.Richmond, IN 473741073711966
- Jeffrey Rapkin, MDRichmond, IN 473741144203274
Common questions
What is Warren Jeffrey Chang, M.D.'s NPI number?
Warren Jeffrey Chang, M.D.'s National Provider Identifier (NPI) is 1902888662, issued on Nov 17, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Warren Jeffrey Chang, M.D. located?
The NPPES record lists a practice address at 1011 W 2ND St, Bloomington, IN, 47403. Phone: (812) 334-1213. Providers update this record themselves, so call before visiting.
How can I verify Warren Jeffrey Chang, M.D.'s license?
NPPES lists Indiana license number IN01052241, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Warren Jeffrey Chang, M.D. prescribe under Medicare Part D?
In 2024, Warren Jeffrey Chang, M.D. had 1,364 Medicare Part D claims for 445 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Warren Jeffrey Chang, M.D.'s MIPS final score?
The 2023 MIPS final score is 95.1 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.