Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Jason Slack, DO

Individual provider Internal Medicine Physician · NPI 1043692197

Jason Slack, DO practises Internal Medicine in Hagerstown, Maryland. Graduated from Edward via Col of Osteo Medicine-Virginia Campus in 2015, 11 years ago. Practices with Meritus Medical Center Inc, a 746-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Kansas, Maryland and Missouri.

Years since qualifying
11
Trained at
Edward via Col of Osteo Medicine-Virginia Campus
Licensed in
KS, MD, MO
In the registry since
2015
Specialties on file
3
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

11116 Medical Campus Rd
Hagerstown, MD 21742-6710
Phone: (301) 790-8804
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1102 W 32nd St, Joplin, MO 64804-3503 — (417) 347-4616

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence H96459 (MD)
Internal Medicine Physician Taxonomy 207R00000X · Licence 05-40745 (KS)
Internal Medicine Physician Taxonomy 207R00000X · Licence 2015017143 (MO)

Record details

NPI number1043692197
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 25, 2015
Last updated in NPPESDecember 29, 2023
Certification dateDecember 29, 2023

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolEDWARD VIA COL OF OSTEO MEDICINE-VIRGINIA CAMPUS
Graduated 2015 (11 years in practice)
Group practice Meritus Medical Center Inc — 746 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients599
Services billed 1,134 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Meritus Medical Center Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 746 clinicians in the practice; 12 are shown here.

Other providers in Hagerstown