NPI Portal NPI Lookup & Verification

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

Marissa T. Santos, M.D.

Internal Medicine Physician in Rego Park, NY · enumerated 2006.

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

National Provider Identifier

1659332377

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Registry record

Entity type Individual (Type 1)
Name Marissa T. Santos
Credential M.D.
Sex Female
Practice address Rego Park, NY, 11374
Phone (718) 478-5600
Fax (718) 478-5335
Enumeration date Mar 31, 2006
Last updated in NPPES Jun 22, 2022

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 198043 (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
0403354 Other NY UNITED HEALTHCARE HMO
1531786 Other NY UNITED HEALTHCARE
470858484 Other NY 1199NATIONAL BENEFIT FUND
01833536 Medicaid NY -
2592255 Other NY GHI
113380648SA01 Other NY CARE PLUS HEALTH PLAN
198043 Other NY HIP HEALTH PLAN OF NY
198043B27 Other NY HEALTH FIRST
41124 Other NY CORPORATE BEN SVC AMERICA
0166AF1 Other NY EMPIRE BCBS WOODSIDE
040426017706 Other NY FIDELIS
1P1113 Other NY HEALTH NET
5816203 Other NY AETNA USHC
8433171 Other NY CIGNA HEALTHCARE
SM8043 Other NY AFFINITY HEALTH PLAN
172917 Other NY ELDERPLAN
11P8501 Other NY NY PRESBYTERIAN
P384086 Other NY OXFORD HEALTH PLANS

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

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 Marissa Santos?
Marissa Santos is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-06-22.