NPI Portal NPI Lookup & Verification

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

Dr. Roy Sidney Lowenstein, M.D.

Psychoanalyst in Denver, CO · enumerated 2007.

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

National Provider Identifier

1548489180

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Registry record

Entity type Individual (Type 1)
Name Dr. Roy Sidney Lowenstein
Credential M.D.
Sex Male
Practice address Denver, CO, 80246
Phone (303) 333-2111
Fax (303) 377-3849
Enumeration date Apr 24, 2007
Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

102L00000X Psychoanalyst Behavioral Health & Social Service Providers · License 17545 (CO) 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
17545 Other CO MEDICAL LICENSE

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 is the NPI number for Roy Lowenstein?
The National Provider Identifier (NPI) for Roy Lowenstein is 1548489180, a Type 1 (individual) record in the CMS NPPES registry.
Where does Roy Lowenstein practice?
The practice location on file with NPPES is in Denver, CO. 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 2007-07-08.