Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Peter M Witherell, M.D.

Pain Medicine (Anesthesiology) Physician in Wilmington, DE · enumerated 2006.

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

National Provider Identifier

1598790099

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Registry record

Entity type Individual (Type 1)

Name Peter M Witherell

Credential M.D.

Sex Male

Practice address 3411 Silverside Road, Suite 103 Rodney Building, Wilmington, DE, 19810

Phone (302) 478-7001

Fax (302) 478-7002

Enumeration date Jul 12, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207LP2900X Pain Medicine (Anesthesiology) Physician Allopathic & Osteopathic Physicians · License C1-0004878 (DE) 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
0000752101	Medicaid	DE	-

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 Witherell practice?

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

What is the NPI number for Peter Witherell?

The National Provider Identifier (NPI) for Peter Witherell is 1598790099, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.