Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Peter Loewinthan, MD

Specialist in Dorchester, MA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1265492243

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Peter Loewinthan

Credential MD

Sex Male

Practice address 1353 Dorchester Ave, Dorchester, MA, 02122

Phone (617) 740-2277

Enumeration date Mar 24, 2006

Last updated in NPPES Aug 22, 2014

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 36533 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
2027291	Medicaid	MA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Peter Loewinthan practice?

The practice location on file with NPPES is in Dorchester, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Peter Loewinthan?

The National Provider Identifier (NPI) for Peter Loewinthan is 1265492243, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-08-22.