Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Douglas James Mathisen, MD

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Boston, MA · enumerated 2005 · practices at Mgh Outpatient Pharmacy.

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

National Provider Identifier

1699759019

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Registry record

Entity type Individual (Type 1)

Name Dr. Douglas James Mathisen

Credential MD

Sex Male

Practice address 55 Fruit Street, Blk 1570 Thoracic Surgery Department, Boston, MA, 02114

Phone (617) 726-6826

Fax (617) 726-7667

Enumeration date Nov 30, 2005

Last updated in NPPES Nov 21, 2012

Taxonomy & licenses

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 39784 (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
0182656	Medicaid	MA	-
710067	Other	MA	TUFTS HEALTH PLAN
E05949	Other	MA	BCBS MA

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 NPI 1699759019 active?

Yes, as of the latest NPPES snapshot, NPI 1699759019 is active (record last updated 2012-11-21).

How do I verify Douglas Mathisen's NPI record?

Cross-check NPI 1699759019 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-11-21.