Michael Lance Gerstenfeld, M.D.
Internal Medicine Physician · Danbury, CT
Michael Lance Gerstenfeld, M.D. is an internal medicine physician with a practice address in Danbury, Connecticut, and NPI 1740311208, issued on Mar 8, 2007. Check the license (Connecticut 031959, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Michael Lance Gerstenfeld
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 031959 CT
31959 CT
Self-reported in NPPES; status is on the state search - Practice location
- 46 Mill Plain RD, Danbury, CT 06811
- Phone
- (203) 297-6120
- Enumerated
- Mar 8, 2007
- Record last updated
- Dec 31, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (203) 297-6122
- Medicare enrollment
- Enrolled (PECOS I20110203000763); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 46 Mill Plain RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michele Gerstenfeld, N.D.Naturopath1144535014
- Edward Markowitz, D.C.Sports Physician Chiropractor1518968247
Verify Michael Lance Gerstenfeld in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 031959Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
35 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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
- M Management Group LLCDanbury, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Lance Gerstenfeld among 2,623 internal medicine physician records in Connecticut
Michael Lance Gerstenfeld, 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 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 44% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1987 · median 2004 among the 1,646 with a school on file
- Record last updated2011 · 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
- Sadikshya Bhandari, MDDanbury, CT 068101942995931
- Tapasya Bhusal, M.DDanbury, CT 068101427747658
- William Biles, M.D.New Fairfield, CT 068121275557167
- Dinusha Dharmaratna, MBBSDanbury, CT 068101669112645
- Ishan Garg, MDDanbury, CT 068101942932256
- Muhammad Islam, M.D.Danbury, CT 068101730884784
- Roger Karlin, MDNew Fairfield, CT 068121700894177
- Oleksandr Klymenko, MDDanbury, CT 068101245920743
Common questions
What is Michael Lance Gerstenfeld, M.D.'s NPI number?
Michael Lance Gerstenfeld, M.D.'s National Provider Identifier (NPI) is 1740311208, issued on Mar 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Michael Lance Gerstenfeld, M.D. located?
The NPPES record lists a practice address at 46 Mill Plain RD, Danbury, CT, 06811. Phone: (203) 297-6120. Providers update this record themselves, so call before visiting.
How can I verify Michael Lance Gerstenfeld, M.D.'s license?
NPPES lists Connecticut license number 031959, 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 Michael Lance Gerstenfeld, M.D. prescribe under Medicare Part D?
In 2024, Michael Lance Gerstenfeld, M.D. had 35 Medicare Part D claims; 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.