Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Collins P Sein, MD

Internal Medicine Physician in Waldorf, MD · enumerated 2005.

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

National Provider Identifier

1699769554

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Registry record

Entity type Individual (Type 1)

Name Collins P Sein

Credential MD

Sex Male

Practice address 3460 Old Washington Rd, Suite 203a, Waldorf, MD, 20602

Phone (301) 934-8811

Fax (301) 934-9321

Enumeration date Sep 7, 2005

Last updated in NPPES Apr 5, 2018

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D0046979 (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
F2470001	Other	DC	BLUE CROSS
293041	Other	MD	MAMSI, ALLIANCE
431203100	Medicaid	MD	-
KAF9SO	Other	MD	BLUE CROSS
110237779	Other	MD	RAILROAD MEDICARE

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 specialty is Collins Sein?

Collins Sein 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.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-04-05.