Diana Chan, M.D.
Internal Medicine Physician · Berkeley Heights, NJ
Diana Chan, M.D. is an internal medicine physician with a practice address in Berkeley Heights, New Jersey, and NPI 1235399288, issued on Jun 12, 2008. Check the license (New Jersey 25MA08988900, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Diana Chan
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 25MA08988900 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 1 Diamond Hill RD, Berkeley Heights, NJ 07922
- Phone
- (908) 273-4300
- Enumerated
- Jun 12, 2008
- Record last updated
- Sep 23, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20111128000724); accepts Medicare assignment
- Medical or professional school
- Rutgers R W Johnson Medical School (Cam/New Bruns/Pisc), 2008
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →
Also registered at 1 Diamond Hill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Diana Chan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA08988900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average internal medicine physician in 2024
414 Medicare Part D claims for 149 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium36 claims
- Amlodipine Besylate35 claims
- Metformin Hcl23 claims
- Lisinopril18 claims
- Simvastatin18 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.
Bills Medicare through one group practice
- Practice Associates Medical GroupMorristown, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Diana Chan among 4,632 internal medicine physician records in New Jersey
Diana Chan, M.D. is one of 4,632 internal medicine physician records with a practice address in New Jersey. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 59% of them.
- NPI issued2008 · 59% of these records are older, 36% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2008 · median 2000 among the 3,132 with a school on file
- Record last updated2011 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
30 internal medicine physician records list a practice address in Berkeley Heights
They are 30 of the 672 NPPES records with a practice address in Berkeley Heights, and 4,632 internal medicine physician records in New Jersey.
All 4,632 in New Jersey → Every provider in Berkeley Heights → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joseph Anton, M.D.Berkeley Heights, NJ 079221396831814
- Christopher Boni, DOBerkeley Heights, NJ 079221023111507
- Michelle Cajulis, M.D.Berkeley Heights, NJ 079221265425342
- Ricardo Camacho, MDBerkeley Heights, NJ 079221124029228
- Deborah Cheung, M.D.Berkeley Heights, NJ 079221255336004
- Peter Colucio, MDBerkeley Heights, NJ 079221184625287
- Craig Feinberg, MDBerkeley Heights, NJ 079221548258007
- Scott Fields, M.D.Berkeley Heights, NJ 079221609825033
Common questions
What is Diana Chan, M.D.'s NPI number?
Diana Chan, M.D.'s National Provider Identifier (NPI) is 1235399288, issued on Jun 12, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Diana Chan, M.D. located?
The NPPES record lists a practice address at 1 Diamond Hill RD, Berkeley Heights, NJ, 07922. Phone: (908) 273-4300. Providers update this record themselves, so call before visiting.
How can I verify Diana Chan, M.D.'s license?
NPPES lists New Jersey license number 25MA08988900, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Diana Chan, M.D. prescribe under Medicare Part D?
In 2024, Diana Chan, M.D. had 414 Medicare Part D claims for 149 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.