Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Stephanie T. Osiecki, MD

Internal Medicine Physician in Boston, MA · enumerated 2005.

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

National Provider Identifier

1922080464

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Registry record

Entity type Individual (Type 1)

Name Stephanie T. Osiecki

Credential MD

Sex Female

Practice address 100 Cambridge St Fl 14, Boston, MA, 02114

Phone (888) 731-8994

Fax (888) 732-8119

Enumeration date Nov 18, 2005

Last updated in NPPES Jun 17, 2024

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 203867 (MA) 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
A30786	Other	MA	BCBS MA
203867	Other	MA	CONNECTICARE
9560323	Other	MA	CIGNA
042104788	Other	MA	CONSOLIDATED
042104788	Other	MA	NORTHEAST HEALTH DIRECT
042104788	Other	MA	UNICARE/GIC
3207749	Medicaid	MA	-
467855	Other	MA	TUFTS
042104788	Other	MA	GREAT-WEST HEALTH PLAN
042104788	Other	MA	NORTH AMERICAN PREFERRED
042104788	Other	MA	PRIVATE HEALTH CARE SYS.
14912	Other	MA	HEALTH NEW ENGLAND
7137629	Other	MA	AETNA
042104788	Other	MA	NORTHEAST HEALTHCARE ALLI
AA24783	Other	MA	HARVARD PILGRIM HEALTHCAR

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

What specialty is Stephanie Osiecki?

Stephanie Osiecki 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 2024-06-17.