Diane S. Morgenthaler, MD
Internal Medicine Physician · Ledyard, CT
Diane S. Morgenthaler, MD is an internal medicine physician with a practice address in Ledyard, Connecticut, and NPI 1578708111, issued on Dec 11, 2008. Check the license (Connecticut 033164, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Diane S. Morgenthaler
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 033164 CT
Self-reported in NPPES; status is on the state search - Practice location
- 75 Norwich Westerly RD, Ledyard, CT 06339
- Phone
- (860) 312-8000
- Enumerated
- Dec 11, 2008
- Record last updated
- Jan 16, 2025
- Medicare enrollment
- Enrolled (PECOS I20240418003167); accepts Medicare assignment
- Medical or professional school
- Medical College Of Pennsylvania, 1988
- Entity
- Type 1 · individual
Also registered at 75 Norwich Westerly RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rosemary Johnson, APRNAdult Health Nurse Practitioner1497188593
Verify Diane S. Morgenthaler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 033164Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Mashantucket Pequot Tribal CouncilLedyard, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
1 internal medicine physician records list a practice address in Ledyard
They are 1 of the 31 NPPES records with a practice address in Ledyard, and 2,623 internal medicine physician records in Connecticut.
Other internal medicine physician records in Connecticut
- Hoda Abdel Salam, M.D.New Britain, CT1144509316
- Gada Abdelhafiz, MDNew London, CT1467649558
- Racha Abi Melhem, MDDerby, CT1902471352
- Gerard Abidor, D.O.Bridgeport, CT1518014539
- Lilyan AbrahamFarmington, CT1447693254
- Richard Abraham, M.D.Canton, CT1023044252
- Odaliz Abreu-Lanfranco, MDNew Haven, CT1538276134
- Kenneth Abriola, MDGlastonbury, CT1083693022
- Florentino Abueg, MDSouthbury, CT1649372558
- Nila Aburto, MDStamford, CT1396325718
Common questions
What is Diane S. Morgenthaler, MD's NPI number?
Diane S. Morgenthaler, MD's National Provider Identifier (NPI) is 1578708111, issued on Dec 11, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Diane S. Morgenthaler, MD located?
The NPPES record lists a practice address at 75 Norwich Westerly RD, Ledyard, CT, 06339. Phone: (860) 312-8000. Providers update this record themselves, so call before visiting.
How can I verify Diane S. Morgenthaler, MD's license?
NPPES lists Connecticut license number 033164, 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.
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.