Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Peter A Merkel, MD, MPH

Rheumatology Physician in Radnor, PA · enumerated 2005.

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

National Provider Identifier

1437136173

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Registry record

Entity type Individual (Type 1)

Name Peter A Merkel

Credential MD, MPH

Sex Male

Practice address 250 King of Prussia, Radnor, PA, 19087

Phone (610) 902-5700

Fax (617) 638-5226

Enumeration date Dec 23, 2005

Last updated in NPPES Feb 3, 2012

Taxonomy & licenses

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 75719 (MA) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 75719 (MA) Secondary

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License MD043272L (PA) 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
3134431	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.

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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 Merkel?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-02-03.