Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

John Casey Heffernan, DO

Individual provider Internal Medicine Physician · NPI 1750818019

John Casey Heffernan, DO is an Internal Medicine in Walla Walla, Washington. Qualified in 2017, 9 years ago. Practices with Providence Health and Services - Washington, a 264-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Washington.

Years since qualifying
9
Licensed in
WA
In the registry since
2017
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

380 Chase Ave
Walla Walla, WA 99362-2924
Phone: (509) 897-5836
Fax: (509) 897-5743
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence OP61434635 (WA)

Record details

NPI number1750818019
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 17, 2017
Last updated in NPPESSeptember 5, 2024
Certification dateSeptember 5, 2024
Mailing address380 Chase Ave, Walla Walla, WA 99362-2924

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Providence Health And Services - Washington — 264 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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