John Nick Chafos, MD
Internal Medicine Physician · Green Brook, NJ
John Nick Chafos, MD is an internal medicine physician with a practice address in Green Brook, New Jersey, and NPI 1871673830, issued on Oct 16, 2006. Check the license (New Jersey 25MA05399400, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John Nick Chafos
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 25MA05399400 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 257 RT 22 East, Green Brook, NJ 08812
- Phone
- (732) 968-8832
- Enumerated
- Oct 16, 2006
- Record last updated
- Mar 29, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (732) 968-2187
- Medicare enrollment
- Enrolled (PECOS I20050622000792); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1988
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →
Verify John Nick Chafos 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 25MA05399400Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% more Medicare Part D claims than the average internal medicine physician in 2024
4,803 Medicare Part D claims for 720 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 52 claims were for opioids.
Most prescribed
- Dexamethasone277 claims
- Atorvastatin Calcium166 claims
- Rosuvastatin Calcium152 claims
- Metoprolol Succinate126 claims
- Cefdinir125 claims
- Amlodipine Besylate124 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
- Family Care PAHillsborough, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Nick Chafos among 4,632 internal medicine physician records in New Jersey
John Nick Chafos, MD 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 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 50% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1988 · 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).
6 internal medicine physician records list a practice address in Green Brook
They are 6 of the 88 NPPES records with a practice address in Green Brook, and 4,632 internal medicine physician records in New Jersey.
All 4,632 in New Jersey → Every provider in Green Brook → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Syed Ahmed, MDGreen Brook, NJ 088121821022799
- Joseph Atanasio, MDGreen Brook, NJ 088121093833949
- Lila Bunales, MDDunellen, NJ 088121548216187
- Anandan Devarajan, MDGreen Brook, NJ 088121619932837
- Amir Karu, MDDunellen, NJ 088121437549730
- Suzan Khalil, MDGreen Brook, NJ 088121265534820
- Yoram Sharon, DOGreen Brook, NJ 088121649202193
- Robert Casper, MDDayton, NJ 088101699832956
Common questions
What is John Nick Chafos, MD's NPI number?
John Nick Chafos, MD's National Provider Identifier (NPI) is 1871673830, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Nick Chafos, MD located?
The NPPES record lists a practice address at 257 RT 22 East, Green Brook, NJ, 08812. Phone: (732) 968-8832. Providers update this record themselves, so call before visiting.
How can I verify John Nick Chafos, MD's license?
NPPES lists New Jersey license number 25MA05399400, 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 John Nick Chafos, MD prescribe under Medicare Part D?
In 2024, John Nick Chafos, MD had 4,803 Medicare Part D claims for 720 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.