Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Peter C Gregg, MD

Q: What is the NPI number for Peter Gregg?

The National Provider Identifier (NPI) for Peter Gregg is 1558564294, a Type 1 (individual) record in the CMS NPPES registry.

Internal Medicine Physician in Baltimore, MD · enumerated 2007.

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

National Provider Identifier

1558564294

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Registry record

Entity type Individual (Type 1)

Name Peter C Gregg

Credential MD

Sex Male

Practice address 1235 E Monument St, Baltimore, MD, 21202

Phone (410) 327-5100

Fax (410) 327-8373

Enumeration date Jun 8, 2007

Last updated in NPPES Jun 18, 2014

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D0070580 (MD) Primary

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

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 is the NPI number for Peter Gregg?

The National Provider Identifier (NPI) for Peter Gregg is 1558564294, a Type 1 (individual) record in the CMS NPPES registry.

Where does Peter Gregg practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-06-18.