Glenn Michael Siegel, M.D.
Endocrinology, Diabetes & Metabolism Physician · Norwalk, CT
Glenn Michael Siegel, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Norwalk, Connecticut, and NPI 1437140514, issued on Oct 28, 2005. Check the license (Connecticut 044239, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Glenn Michael Siegel
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 044239 CT
Self-reported in NPPES; status is on the state search - Practice location
- 761 Main Ave, Norwalk, CT 06851
- Phone
- (203) 838-4000
- Enumerated
- Oct 28, 2005
- Record last updated
- Mar 29, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (203) 845-9535
- Medicaid ID
- 004187466 CT
- Medicare enrollment
- Enrolled (PECOS I20060721000247); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 214 in Connecticut → Look up another NPI →
Also registered at 761 Main Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Stella Arbitman, M.D., CCFPFamily Medicine Physician1467726141
- Thomas Ayoub, MDObstetrics & Gynecology Physician1700990652
- Kristen Baker, PA CMedical Physician Assistant1427061100
- Sharyu Bande, MDInternal Medicine Physician1619130705
- Cindy Barboza, APRNFamily Nurse Practitioner1528499951
Verify Glenn Michael Siegel in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 044239Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average endocrinology, diabetes & metabolism physician in 2024
6,485 Medicare Part D claims for 791 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 45% of claims.
Most prescribed
- Levothyroxine Sodium782 claims
- Metformin Hcl587 claims
- Jardiance565 claims
- Ozempic458 claims
- Lantus Solostar435 claims
- Alendronate Sodium346 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 84.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Hartford Healthcare Medical Group Specialists PLLCStorrs, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Glenn Michael Siegel among 214 endocrinology, diabetes & metabolism physician records in Connecticut
Glenn Michael Siegel, M.D. is one of 214 endocrinology, diabetes & metabolism physician records with a practice address in Connecticut. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2001 · median 2004 among the 145 with a school on file
- Record last updated2011 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Connecticut
There are 214 endocrinology, diabetes & metabolism physician records in Connecticut.
All 214 in Connecticut → Every provider in Norwalk → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Neelum AnwaarNorwalk, CT 068511336670041
- Maria Martin, M.D.Norwalk, CT 068511033341011
- Powlimi Soni, MDNorwalk, CT 068511487645362
- Randi Tomasulo, M.D.Norwalk, CT 068511508980574
- Maria Guoth, MDGreenwich, CT 068311356386965
- Mary Arden-Cordone, M.D.,Greenwich, CT 068301649318585
- Shelly Im, MDGreenwich, CT 068301740496470
- Ranee Angeli Lleva, M.D.Greenwich, CT 068301578709143
Common questions
What is Glenn Michael Siegel, M.D.'s NPI number?
Glenn Michael Siegel, M.D.'s National Provider Identifier (NPI) is 1437140514, issued on Oct 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Glenn Michael Siegel, M.D. located?
The NPPES record lists a practice address at 761 Main Ave, Norwalk, CT, 06851. Phone: (203) 838-4000. Providers update this record themselves, so call before visiting.
How can I verify Glenn Michael Siegel, M.D.'s license?
NPPES lists Connecticut license number 044239, 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 Glenn Michael Siegel, M.D. prescribe under Medicare Part D?
In 2024, Glenn Michael Siegel, M.D. had 6,485 Medicare Part D claims for 791 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is Glenn Michael Siegel, M.D.'s MIPS final score?
The 2023 MIPS final score is 84.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.