Nancy J. Rennert, MD
Internal Medicine Physician · Norwalk, CT
Nancy J. Rennert, MD is an internal medicine physician with a practice address in Norwalk, Connecticut, and NPI 1528089950, issued on Jul 21, 2006. Check the license (Connecticut 031031, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Nancy J. Rennert
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 031031 CT
Self-reported in NPPES; status is on the state search - Practice location
- 24 Stevens St, Norwalk, CT 06850
- Phone
- (203) 852-2375
- Enumerated
- Jul 21, 2006
- Record last updated
- Oct 1, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (203) 852-2057
- Medicaid ID
- 004192051 CT
- Medicare enrollment
- Enrolled (PECOS I20061012000555); accepts Medicare assignment
- Medical or professional school
- University Of Pittsburgh School Of Medicine, 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 24 Stevens St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- James Belisle, MDNeonatal-Perinatal Medicine Physician1679543136
Verify Nancy J. Rennert in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 031031Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
74 Medicare Part D claims for 17 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 65% of claims.
Most prescribed
- Mounjaro21 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 MIPS final score for 2023 (Medicare payment program): 94.2 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $74.33
4 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Norwalk Community Health Center IncNorwalk, CT
- Nuvance Health Medical Practice CT IncDanbury, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nancy J. Rennert among 2,623 internal medicine physician records in Connecticut
Nancy J. Rennert, MD 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 fileYes · 63% of these records are
- Graduated1987 · median 2004 among the 1,646 with a school on file
- Record last updated2008 · 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).
79 internal medicine physician records list a practice address in Norwalk
They are 79 of the 1,993 NPPES records with a practice address in Norwalk, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Norwalk → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Shaan Bhojwani, M.D.Norwalk, CT 068501821046632
- Joseph Cleary, MDNorwalk, CT 068501285605261
- Satish Gopal, MDNorwalk, CT 068501841260718
- Vasiliki Harisis, M.D.Norwalk, CT 068501184740516
- Anjum Khan, MDNorwalk, CT 068501992775258
- Mark Kulaga, MDNorwalk, CT 068501851361117
- Meenatchi Kumaraguruparan, M.DNorwalk, CT 068501063639656
- Marc Legris, M.D.Norwalk, CT 068501114935723
Common questions
What is Nancy J. Rennert, MD's NPI number?
Nancy J. Rennert, MD's National Provider Identifier (NPI) is 1528089950, issued on Jul 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nancy J. Rennert, MD located?
The NPPES record lists a practice address at 24 Stevens St, Norwalk, CT, 06850. Phone: (203) 852-2375. Providers update this record themselves, so call before visiting.
How can I verify Nancy J. Rennert, MD's license?
NPPES lists Connecticut license number 031031, 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 Nancy J. Rennert, MD prescribe under Medicare Part D?
In 2024, Nancy J. Rennert, MD had 74 Medicare Part D claims for 17 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Nancy J. Rennert, MD's MIPS final score?
The 2023 MIPS final score is 94.2 of 100. 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.