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

Dr. Mark W Day, DO

Individual provider Obstetrics & Gynecology Physician · NPI 1225050560

Dr. Mark W Day, DO is an Obstetrics/Gynecology in Middletown, Ohio. Graduated from Des Moines University of Osteopathic Medicine and Health Sciences in 1995, 31 years ago. Practices with Dayton Osteopathic Hospital, a 35-clinician group and accepts Medicare assignment. Licensed in Ohio.

Years since qualifying
31
Trained at
Des Moines University of Osteopathic Medicine and Health Sciences
Licensed in
OH
In the registry since
2006
Specialties on file
2
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.

See every abbreviation used in this directory →

Practice location Address checks out

6147 State Route 122 Ste 110
Middletown, OH 45005-5201
Phone: (513) 261-3500
Fax: (513) 261-3509
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence 34.007014 (OH)
Obstetrics & Gynecology Physician Taxonomy 207V00000X · Licence 31-1715747 (OH)

Record details

NPI number1225050560
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedJuly 24, 2006
Last updated in NPPESFebruary 1, 2021
Certification dateFebruary 1, 2021
Mailing address6147 State Route 122 Ste 110, Middletown, OH 45005-5201

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolDES MOINES UNIVERSITY OF OSTEOPATHIC MEDICINE AND HEALTH SCIENCES
Graduated 1995 (31 years in practice)
Group practice Dayton Osteopathic Hospital — 35 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

Other providers in Middletown