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

Gregory Keith Riffle, DO

Individual provider Internal Medicine Physician · NPI 1427398429

Gregory Keith Riffle, DO practises Internal Medicine in Lancaster, Ohio. Graduated from Ohio University, College of Osteopathic Medicine in 2013, 13 years ago. Practices with Fairfield Healthcare Professionals Inc, a 146-clinician group and accepts Medicare assignment. Licensed in Ohio.

Years since qualifying
13
Trained at
Ohio University, College of Osteopathic Medicine
Licensed in
OH
In the registry since
2013
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

135 N Ewing St Ste 305
Lancaster, OH 43130-3382 Not confirmed with CMS for 10 years — call before visiting
Phone: (740) 681-9447
Fax: (740) 681-9966
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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 34011676 (OH)

Record details

NPI number1427398429
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedFebruary 27, 2013
Last updated in NPPESAugust 4, 2016

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOHIO UNIVERSITY, COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 2013 (13 years in practice)
Group practice Fairfield Healthcare Professionals Inc — 146 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients205
Services billed 585 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 Fairfield Healthcare Professionals Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 146 clinicians in the practice; 12 are shown here.

Other providers in Lancaster