Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Peter Alfred Schlesinger, M.D.

Internal Medicine Physician in Cambridge, MA · enumerated 2006 · practices at Cambridge Physical Therapy, Inc..

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

National Provider Identifier

1265409650

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Peter Alfred Schlesinger

Credential M.D.

Sex Male

Practice address Cambridge, MA, 02141

Phone (617) 876-1668

Fax (617) 864-0666

Enumeration date Mar 3, 2006

Last updated in NPPES Mar 26, 2013

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 40898 (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
701622	Other	MA	TUFTS
75426	Other	MA	AETNA
04-01424	Other	MA	UNITED HEALTH CARE
80026	Other	MA	CIGNA
2083809	Medicaid	MA	-
M09570	Other	MA	BLUE CROSS BLUE SHIELD
60533	Other	MA	HARVARD PILGRIM

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

What specialty is Peter Schlesinger?

Peter Schlesinger is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Cambridge Physical Therapy, Inc. Physical Therapy Clinic/Center · Cambridge, MA NPI 1073655296

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-03-26.