Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Alex Mackay Calderwood, PA-C

Physician Assistant in Tacoma, WA · enumerated 2019.

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

National Provider Identifier

1538723937

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Registry record

Entity type Individual (Type 1)

Name Mr. Alex Mackay Calderwood

Credential PA-C

Sex Male

Practice address 1717 S J St, Tacoma, WA, 98405

Phone (844) 364-2778

Fax (253) 428-8440

Enumeration date May 1, 2019

Last updated in NPPES Apr 19, 2021

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA61135685 (WA) Primary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 23.004437 (CT) Secondary

363AS0400X Surgical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 4437 (CT) Secondary

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

Is NPI 1538723937 active?

Yes, as of the latest NPPES snapshot, NPI 1538723937 is active (record last updated 2021-04-19).

How do I verify Alex Calderwood's NPI record?

Cross-check NPI 1538723937 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 2021-04-19.