Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

House, Lee, Mast, Mcdonald and Nelson, PC

Orthodontics and Dentofacial Orthopedics Dentistry in Mercer Island, WA · enumerated 2021 · authorized official Marilyn Chorak, Reg. Ops Manager.

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

National Provider Identifier

1699353599

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Registry record

Entity type Organization (Type 2)

Legal business name House, Lee, Mast, Mcdonald and Nelson, PC

Practice address 3022 78th Ave Se, Mercer Island, WA, 98040

Phone (206) 275-3042

Enumeration date Mar 31, 2021

Last updated in NPPES Mar 31, 2021

Taxonomy & classification

1223X0400X Orthodontics and Dentofacial Orthopedics Dentistry Dental Providers Primary

Authorized official

Name Marilyn Chorak

Title Reg. Ops Manager

Phone (206) 275-3042

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2021-03-31. Verify at npiregistry.cms.hhs.gov.

Where is House, Lee, Mast, Mcdonald and Nelson, PC located?

The practice location on file with NPPES is in Mercer Island, WA.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-31.