NPI Portal NPI Lookup & Verification

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

Dr. Alan R Weinstock, M.D.

Internal Medicine Physician in Silver Spring, MD · enumerated 2006.

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

National Provider Identifier

1912975970

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Registry record

Entity type Individual (Type 1)
Name Dr. Alan R Weinstock
Credential M.D.
Sex Male
Practice address Silver Spring, MD, 20902
Phone (301) 593-3500
Fax (301) 593-7010
Enumeration date Mar 8, 2006
Last updated in NPPES Jan 14, 2010

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D0009748 (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
155361500 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

How do I verify Alan Weinstock's NPI record?
Cross-check NPI 1912975970 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1912975970 active?
Yes, as of the latest NPPES snapshot, NPI 1912975970 is active (record last updated 2010-01-14).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-01-14.