John Casey Heffernan, DO
Internal Medicine Physician · Walla Walla, WA
John Casey Heffernan, DO is an internal medicine physician with a practice address in Walla Walla, Washington, and NPI 1750818019, issued on May 17, 2017. Check the license (Washington OP61434635, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- John Casey Heffernan
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- OP61434635 WA
Self-reported in NPPES; status is on the state search - Practice location
- 380 Chase Ave, Walla Walla, WA 99362
- Phone
- (509) 897-5836
- Enumerated
- May 17, 2017
- Record last updated
- Sep 5, 2024
- Fax
- (509) 897-5743
- Medicare enrollment
- Enrolled (PECOS I20240205001735); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Also registered at 380 Chase Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Angela Bly, RNHome Health Registered Nurse1801624325
- Abigail BradleyPhysician Assistant1013785955
- Sarah CochellPhysical Therapy Assistant1528809282
Verify John Casey Heffernan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license OP61434635Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% more Medicare Part D claims than the average internal medicine physician in 2024
4,850 Medicare Part D claims for 616 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 209 claims were for opioids.
Most prescribed
- Atorvastatin Calcium195 claims
- Levothyroxine Sodium156 claims
- Gabapentin121 claims
- Ozempic121 claims
- Omeprazole119 claims
- Lisinopril108 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 95 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $134.49
7 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Providence Health And Services - WashingtonWalla Walla, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Casey Heffernan among 3,079 internal medicine physician records in Washington
John Casey Heffernan, DO is one of 3,079 internal medicine physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 82% of them.
- NPI issued2017 · 82% of these records are older, 16% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2017 · median 2006 among the 1,852 with a school on file
- Record last updated2024 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
37 internal medicine physician records list a practice address in Walla Walla
They are 37 of the 1,276 NPPES records with a practice address in Walla Walla, and 3,079 internal medicine physician records in Washington.
All 3,079 in Washington → Every provider in Walla Walla → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kevin Andrews, MDWalla Walla, WA 993621174513873
- Eric Ball, M.D.Walla Walla, WA 993621275507485
- Karen Geheb, M.D.Walla Walla, WA 993621972532745
- Dan Grinstead, M.D.Walla Walla, WA 993621881668010
- Philip Hooper, MDWalla Walla, WA 993621154307742
- Eric Jauhiainen, M.D.Walla Walla, WA 993621235103466
- Stevie Mazyck, MDWalla Walla, WA 993621902835697
- Patricia McIlvaine, M.D.Walla Walla, WA 993621689648594
Common questions
What is John Casey Heffernan, DO's NPI number?
John Casey Heffernan, DO's National Provider Identifier (NPI) is 1750818019, issued on May 17, 2017. An NPI identifies a provider in billing; it is not a license.
Where is John Casey Heffernan, DO located?
The NPPES record lists a practice address at 380 Chase Ave, Walla Walla, WA, 99362. Phone: (509) 897-5836. Providers update this record themselves, so call before visiting.
How can I verify John Casey Heffernan, DO's license?
NPPES lists Washington license number OP61434635, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Casey Heffernan, DO prescribe under Medicare Part D?
In 2024, John Casey Heffernan, DO had 4,850 Medicare Part D claims for 616 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is John Casey Heffernan, DO's MIPS final score?
The 2023 MIPS final score is 95 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.