Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael Sean Marcin, M.D., M.S.C.R.

Neurodevelopmental Disabilities Physician in Mountain View, CA · enumerated 2007.

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

National Provider Identifier

1528100021

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael Sean Marcin

Credential M.D., M.S.C.R.

Sex Male

Practice address 298 San Antonio Rd Ste 100, Mountain View, CA, 94040

Phone (650) 446-4900

Enumeration date Feb 12, 2007

Last updated in NPPES Apr 16, 2024

Taxonomy & licenses

2084P0005X Neurodevelopmental Disabilities Physician Allopathic & Osteopathic Physicians · License 049407 (GA) Secondary

2084P0005X Neurodevelopmental Disabilities Physician Allopathic & Osteopathic Physicians · License MD.61213218 (WA) Secondary

2084P0005X Neurodevelopmental Disabilities Physician Allopathic & Osteopathic Physicians · License 314609-01 (NY) Secondary

2084P0804X Child & Adolescent Psychiatry Physician Allopathic & Osteopathic Physicians · License MD26579 (OR) Secondary

2084P0005X Neurodevelopmental Disabilities Physician Allopathic & Osteopathic Physicians · License C 55101 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

Where does Michael Marcin practice?

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

What is the NPI number for Michael Marcin?

The National Provider Identifier (NPI) for Michael Marcin is 1528100021, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-04-16.