Andrew M. Siber, M.D.
Internal Medicine Physician · Uxbridge, MA
Andrew M. Siber, M.D. is an internal medicine physician with a practice address in Uxbridge, Massachusetts, and NPI 1083787220, issued on Nov 16, 2006. Check the license (Massachusetts 230472, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Andrew M. Siber
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 230472 MA
Self-reported in NPPES; status is on the state search - Practice location
- 281 E Hartford Ave, Uxbridge, MA 01569
- Phone
- (508) 278-5573
- Enumerated
- Nov 16, 2006
- Record last updated
- Oct 28, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (508) 278-8477
- Medicare enrollment
- Enrolled (PECOS I20070802000272); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 2003
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 281 E Hartford Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Pamela Baggeroer, M.D.Internal Medicine Physician1942262324
- Christopher Bilodeau, NPNurse Practitioner1942274287
- Margret Chang, M.D.Internal Medicine Physician1902124282
- Nicolina Cordaro, M.D.Pediatrics Physician1861454548
- Christina Cronin, LICSWClinical Social Worker1194039842
- Peter Dain, M.D.Internal Medicine Physician1043275902
Verify Andrew M. Siber in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 230472Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% more Medicare Part D claims than the average internal medicine physician in 2024
5,688 Medicare Part D claims for 465 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 111 claims were for opioids.
Most prescribed
- Atorvastatin Calcium645 claims
- Lisinopril332 claims
- Amlodipine Besylate307 claims
- Losartan Potassium233 claims
- Omeprazole194 claims
- Rosuvastatin Calcium187 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.
Bills Medicare through one group practice
- Umass Memorial Medical Group IncUxbridge, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrew M. Siber among 6,825 internal medicine physician records in Massachusetts
Andrew M. Siber, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2003 · median 2004 among the 4,103 with a school on file
- Record last updated2020 · 64% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
13 internal medicine physician records list a practice address in Uxbridge
They are 13 of the 139 NPPES records with a practice address in Uxbridge, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Uxbridge → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Pamela Baggeroer, M.D.Uxbridge, MA 015691942262324
- Margret Chang, M.D.Uxbridge, MA 015691902124282
- Peter Dain, M.D.Uxbridge, MA 015691043275902
- Thi Hong Van Do, M.D.Uxbridge, MA 015691255718318
- Eric Matthews, D.O.Uxbridge, MA 015691275730368
- Maria Patricia Miranda, M.D.Uxbridge, MA 015691952622615
- William Muller, M.D.Uxbridge, MA 015691891758090
- Chiaki Nakata, M.D.Uxbridge, MA 015691174055347
Common questions
What is Andrew M. Siber, M.D.'s NPI number?
Andrew M. Siber, M.D.'s National Provider Identifier (NPI) is 1083787220, issued on Nov 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Andrew M. Siber, M.D. located?
The NPPES record lists a practice address at 281 E Hartford Ave, Uxbridge, MA, 01569. Phone: (508) 278-5573. Providers update this record themselves, so call before visiting.
How can I verify Andrew M. Siber, M.D.'s license?
NPPES lists Massachusetts license number 230472, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrew M. Siber, M.D. prescribe under Medicare Part D?
In 2024, Andrew M. Siber, M.D. had 5,688 Medicare Part D claims for 465 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.