Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Peter Geis, M.D.

Surgery Physician in Owings Mills, MD · enumerated 2006.

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

National Provider Identifier

1790744092

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Registry record

Entity type Individual (Type 1)

Name Dr. William Peter Geis

Credential M.D.

Sex Male

Practice address 21 Crossroads Dr, Suite 360, Owings Mills, MD, 21117

Phone (410) 356-0410

Fax (410) 356-5237

Enumeration date Mar 23, 2006

Last updated in NPPES Nov 5, 2009

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License D0045452 (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
CC3484	Other	MD	R/R MEDICARE GROUP #
P00752374	Other	MD	R/R MEDICARE INDIVIDUAL #
215221500	Medicaid	MD	-

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

What specialty is William Geis?

William Geis is registered in NPPES with the primary taxonomy of Surgery 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

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Laurie Abrams Diagnostic Radiology Physician · Owings Mills, MD NPI 1184622615 Antonio Nelson Diagnostic Radiology Physician · Owings Mills, MD NPI 1538155866 Richard Franklin Specialist · Owings Mills, MD NPI 1962493031 Verinder Nirankari Ophthalmology Physician · Owings Mills, MD NPI 1437140134 Vinod Lakhanpal Ophthalmology Physician · Owings Mills, MD NPI 1851374995 Ellie Goldbloom Internal Medicine Physician · Owings Mills, MD NPI 1437135092 David Blanton Diagnostic Radiology Physician · Owings Mills, MD NPI 1306817218 Joan Bennett Diagnostic Radiology Physician · Owings Mills, MD NPI 1598736357

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-11-05.