Alan Chang, M.D.
Endocrinology, Diabetes & Metabolism Physician · East Setauket, NY
Alan Chang, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in East Setauket, New York, and NPI 1649408675, issued on Jun 29, 2009. Check the license (New York 301834, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Alan Chang
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- 301834 NY
MD452043 PA
Self-reported in NPPES; status is on the state search - Practice location
- 4 Technology Dr Ste 104, East Setauket, NY 11733
- Phone
- (631) 444-0580
- Enumerated
- Jun 29, 2009
- Record last updated
- Nov 4, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (631) 444-0562
- Medicare enrollment
- Enrolled (PECOS I20191204000663); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 970 in New York → Look up another NPI →
Verify Alan Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 301834Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,290 Medicare Part D claims for 293 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 44% of claims.
Most prescribed
- Levothyroxine Sodium345 claims
- Ozempic209 claims
- Metformin Hcl Er140 claims
- Metformin Hcl127 claims
- Lantus Solostar109 claims
- Nano 2nd Gen Pen Needle98 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 MIPS final score for 2023 (Medicare payment program): 98.5 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $671.02
7 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 5,661 providers of this specialty with any payment received $5,742.15 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
- Stony Brook Internists University Faculty Practice CorporationStony Brook, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alan Chang among 970 endocrinology, diabetes & metabolism physician records in New York
Alan Chang, M.D. is one of 970 endocrinology, diabetes & metabolism physician records with a practice address in New York. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 57% of them.
- NPI issued2009 · 57% of these records are older, 38% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2009 · median 2004 among the 694 with a school on file
- Record last updated2019 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 endocrinology, diabetes & metabolism physician records list a practice address in East Setauket
They are 11 of the 972 NPPES records with a practice address in East Setauket, and 970 endocrinology, diabetes & metabolism physician records in New York.
All 970 in New York → Every provider in East Setauket → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Harold Carlson, M.D.East Setauket, NY 117331194750034
- Marina Charitou, MDEast Setauket, NY 117331518053248
- Judith Chown, MDSetauket, NY 117331932492832
- Marie Gelato, M.D.East Setauket, NY 117331730114570
- Karyn GinsburgEast Setauket, NY 117331588853287
- Anoop Kapoor, M.D.East Setauket, NY 117331447285168
- Svetlana Katsnelson, MDEast Setauket, NY 117331972829000
- Igor Kravets, MDEast Setauket, NY 117331376729947
Common questions
What is Alan Chang, M.D.'s NPI number?
Alan Chang, M.D.'s National Provider Identifier (NPI) is 1649408675, issued on Jun 29, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Alan Chang, M.D. located?
The NPPES record lists a practice address at 4 Technology Dr Ste 104, East Setauket, NY, 11733. Phone: (631) 444-0580. Providers update this record themselves, so call before visiting.
How can I verify Alan Chang, M.D.'s license?
NPPES lists New York license number 301834, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alan Chang, M.D. prescribe under Medicare Part D?
In 2024, Alan Chang, M.D. had 2,290 Medicare Part D claims for 293 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is Alan Chang, M.D.'s MIPS final score?
The 2023 MIPS final score is 98.5 of 100. 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.