NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Alan Mark Geringer, M.D.

Urology Physician in Baltimore, MD · enumerated 2006 · practices at Kenneth Miller MD LLC.

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

National Provider Identifier

1114981065

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Alan Mark Geringer
Credential M.D.
Sex Male
Practice address Baltimore, MD, 21215
Phone (443) 970-3608
Fax (949) 561-4415
Enumeration date Apr 15, 2006
Last updated in NPPES Sep 3, 2025

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RA0401X Addiction Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License D29143 (MD) Secondary
208800000X Urology Physician Allopathic & Osteopathic Physicians · License D29143 (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
372001200 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.

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 Alan Geringer?
Alan Geringer is registered in NPPES with the primary taxonomy of Urology 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 2025-09-03.