Robert A. Altbaum, M.D.
Internal Medicine Physician · Westport, CT
Robert A. Altbaum, M.D. is an internal medicine physician with a practice address in Westport, Connecticut, and NPI 1285736124, issued on Sep 1, 2006. Check the license (Connecticut 021030, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Robert A. Altbaum
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 021030 CT
Self-reported in NPPES; status is on the state search - Practice location
- 333 Post Road West, Westport, CT 06880
- Phone
- (203) 226-0731
- Enumerated
- Sep 1, 2006
- Record last updated
- Sep 9, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (203) 226-1792
- Medicare enrollment
- Enrolled (PECOS I20100903000169); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 1975
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 333 Post Road West
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Baum, M.D.Internal Medicine Physician1437175486
- Jill Denowitz, M.D.Internal Medicine Physician1215013941
- Nina Karol, M.D.Internal Medicine Physician1548286818
- Robert Teltser, M.D.Internal Medicine Physician1821291675
Verify Robert A. Altbaum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 021030Check 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
64 Medicare Part D claims for 16 beneficiaries, 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
- Norwalk Community Health Center IncNorwalk, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert A. Altbaum among 2,623 internal medicine physician records in Connecticut
Robert A. Altbaum, 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 fileYes · 63% of these records are
- Graduated1975 · median 2004 among the 1,646 with a school on file
- Record last updated2015 · 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).
23 internal medicine physician records list a practice address in Westport
They are 23 of the 886 NPPES records with a practice address in Westport, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Westport → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Baum, M.D.Westport, CT 068801437175486
- Jill Denowitz, M.D.Westport, CT 068801215013941
- Robert Dresdner, M.D.Westport, CT 068801356443204
- Samuel Frumkin, M.D.Westport, CT 068801124120043
- Jay Horn, M.D.Westport, CT 068801013093731
- Nina Karol, M.D.Westport, CT 068801548286818
- Anthony Lamarca, MDWestport, CT 068801336105139
- Blaine Messing, MDWestport, CT 068801790704690
Common questions
What is Robert A. Altbaum, M.D.'s NPI number?
Robert A. Altbaum, M.D.'s National Provider Identifier (NPI) is 1285736124, issued on Sep 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert A. Altbaum, M.D. located?
The NPPES record lists a practice address at 333 Post Road West, Westport, CT, 06880. Phone: (203) 226-0731. Providers update this record themselves, so call before visiting.
How can I verify Robert A. Altbaum, M.D.'s license?
NPPES lists Connecticut license number 021030, 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 Robert A. Altbaum, M.D. prescribe under Medicare Part D?
In 2024, Robert A. Altbaum, M.D. had 64 Medicare Part D claims for 16 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.