Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark P Macfarlane, MD

Surgery Physician in Issaquah, WA · enumerated 2006.

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

National Provider Identifier

1881666931

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Registry record

Entity type Individual (Type 1)

Name Mark P Macfarlane

Credential MD

Sex Male

Practice address 751 Ne Blakely Dr, Ste 4020, Issaquah, WA, 98029

Phone (425) 313-7124

Fax (425) 323-7072

Enumeration date Feb 3, 2006

Last updated in NPPES Jul 1, 2015

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License MD00034860 (WA) 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
P00179773	Other	-	RAILROAD MEDICARE
8211492	Medicaid	WA	-
0189203	Other	-	DEPARTMENT LABOR INDUSTRI

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 1881666931 active?

Yes, as of the latest NPPES snapshot, NPI 1881666931 is active (record last updated 2015-07-01).

How do I verify Mark Macfarlane's NPI record?

Cross-check NPI 1881666931 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 2015-07-01.