Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Peter L Wisniewski, MD

Internal Medicine Physician in Prince Frederick, MD · enumerated 2007 · practices at Calvert Internal Medicine Group PA.

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

National Provider Identifier

1922157593

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Peter L Wisniewski

Credential MD

Sex Male

Practice address 985 Prince Frederick Blvd Ste 201, Prince Frederick, MD, 20678

Phone (410) 535-2005

Fax (410) 535-4850

Enumeration date Jan 10, 2007

Last updated in NPPES Feb 21, 2019

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License D40370 (MD) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D40370 (MD) 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
2148224	Other	MD	AETNA HMO PCP
762771800	Medicaid	MD	-
7720001	Other	MD	AETNA NON-HMO SPECIALIST
110108206	Other	MD	RAILROAD MEDICARE
836794	Other	MD	MAMSI HMO PCP
52585801	Other	MD	CAREFIRST OF MARYLAND
C0410016	Other	DC	CAREFIRST OF DC
2154481	Other	MD	AETNA HMO SPECIALIST
436794	Other	MD	MAMSI HMO SPECIALIST
4461101	Other	MD	AETNA NON-HMO PCP

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

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.

What specialty is Peter Wisniewski?

Peter Wisniewski 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.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-02-21.