NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John Casey Heffernan, DO

Internal Medicine Physician in Walla Walla, WA · enumerated 2017.

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

National Provider Identifier

1750818019

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name John Casey Heffernan
Credential DO
Sex Male
Practice address 380 Chase Ave, Walla Walla, WA, 99362
Phone (509) 897-5836
Fax (509) 897-5743
Enumeration date May 17, 2017
Last updated in NPPES Sep 5, 2024

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License OP61434635 (WA) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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

Is NPI 1750818019 active?
Yes, as of the latest NPPES snapshot, NPI 1750818019 is active (record last updated 2024-09-05).
How do I verify John Heffernan's NPI record?
Cross-check NPI 1750818019 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-05.