Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alexander Christakis, M.D.

Anatomic Pathology & Clinical Pathology Physician in Boston, MA · enumerated 2016.

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

National Provider Identifier

1538512231

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Registry record

Entity type Individual (Type 1)

Name Dr. Alexander Christakis

Credential M.D.

Sex Male

Practice address 75 Francis St, Boston, MA, 02115

Phone (617) 732-5500

Enumeration date Jul 18, 2016

Last updated in NPPES Apr 2, 2026

Taxonomy & licenses

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 278394 (MA) Primary

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 267112 (MA) Secondary

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License MD17375 (RI) Secondary

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 Alexander Christakis practice?

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

What is the NPI number for Alexander Christakis?

The National Provider Identifier (NPI) for Alexander Christakis is 1538512231, 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 2026-04-02.