Jerzy Chachaj, M.D.
Internal Medicine Physician · Danbury, CT
Jerzy Chachaj, M.D. is an internal medicine physician with a practice address in Danbury, Connecticut, and NPI 1205857117, issued on Jul 23, 2006. Check the license (Connecticut 034312, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Jerzy Chachaj
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 034312 CT
Self-reported in NPPES; status is on the state search - Practice location
- 24 Hospital Ave, Danbury, CT 06810
- Phone
- (203) 739-7411
- Enumerated
- Jul 23, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 24 Hospital Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jacqueline AddonaStudent in an Organized Health Care Education/Training Program1669232443
- Fernando Afonso, M.D.Internal Medicine Physician1992980536
- Alka Aggarwal, MDInternal Medicine Physician1427041987
- Mohamed Ahmed, M.D.Internal Medicine Physician1235391756
- Syed Rakin Ahmed, MD, PHDStudent in an Organized Health Care Education/Training Program1518809870
- Gregory Albert, MDAnesthesiology Physician1588797930
Verify Jerzy Chachaj in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 034312Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
493 Medicare Part D claims for 48 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Lisinopril42 claims
- Metformin Hcl39 claims
- Levothyroxine Sodium24 claims
- Losartan Potassium22 claims
- Sertraline Hcl21 claims
- Simvastatin20 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.
Jerzy Chachaj among 2,623 internal medicine physician records in Connecticut
Jerzy Chachaj, M.D. is one of 2,623 internal medicine physician records with a practice address in Connecticut. 81% 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 11% of them.
- NPI issued2006 · 11% of these records are older, 52% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2007 · 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 207R00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
112 internal medicine physician records list a practice address in Danbury
They are 112 of the 2,412 NPPES records with a practice address in Danbury, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Danbury → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Alka Aggarwal, MDDanbury, CT 068101427041987
- Charles Cahn, M.D.Danbury, CT 068101720064504
- Karen Coblens, MDDanbury, CT 068101063479848
- Allen Davis, M.D.Danbury, CT 068101639163439
- Amin Elashker, DODanbury, CT 068101093794182
- Sateesh Kathiravelu, M.D.Danbury, CT 068101083665244
- Asha Marhatta, MD; MPHDanbury, CT 068101366490013
- Kathleen Mauks, M.D.Danbury, CT 068101629064035
Common questions
What is Jerzy Chachaj, M.D.'s NPI number?
Jerzy Chachaj, M.D.'s National Provider Identifier (NPI) is 1205857117, issued on Jul 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jerzy Chachaj, M.D. located?
The NPPES record lists a practice address at 24 Hospital Ave, Danbury, CT, 06810. Phone: (203) 739-7411. Providers update this record themselves, so call before visiting.
How can I verify Jerzy Chachaj, M.D.'s license?
NPPES lists Connecticut license number 034312, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jerzy Chachaj, M.D. prescribe under Medicare Part D?
In 2024, Jerzy Chachaj, M.D. had 493 Medicare Part D claims for 48 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.