Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark U Alvarado, MD

Addiction Psychiatry Physician in Brooklyn, NY · enumerated 2005.

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

National Provider Identifier

1821090663

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark U Alvarado

Credential MD

Sex Male

Practice address 514 49th St, Sunset Terrace Family Health Center, Brooklyn, NY, 11220

Phone (718) 437-5235

Fax (718) 437-5239

Enumeration date Aug 11, 2005

Last updated in NPPES Jun 6, 2011

Taxonomy & licenses

2084A0401X Addiction Medicine (Psychiatry & Neurology) Physician Allopathic & Osteopathic Physicians · License 25MA05668900 (NJ) Secondary

2084P0802X Addiction Psychiatry Physician Allopathic & Osteopathic Physicians · License 229671 (NY) 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
5314500	Medicaid	NJ	-

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

Where does Mark Alvarado practice?

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

What is the NPI number for Mark Alvarado?

The National Provider Identifier (NPI) for Mark Alvarado is 1821090663, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-06-06.