DR. MARK W DAY D.O
NPI 1225050560
Obstetrics & Gynecology in Middletown, OH
About Dr. Mark W Day D.o NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK W DAY D.O (NPI 1225050560) is an individual obstetrics & gynecology provider in Middletown, Ohio, licensed in Ohio (34.007014) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Kettering Health Dayton, and is a graduate of Des Moines University Of Osteopathic Medicine And Health Sciences (1995).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Mark W Day D.o is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Mark Day reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Miamisburg, OH 45342
- Reassigned Medicare billing, Ohio enrollment
- 984 clinicians in this Medicare group
Dayton, OH 45459
- Reassigned Medicare billing, Ohio enrollment
- 105 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Kettering Health Dayton
Acute Care Hospitals · Dayton, OHPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 45005 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Day's NPI number?
The NPI number for Mark Day is 1225050560. It was assigned to this individual provider in the NPPES registry on July 24, 2006.
Where is Mark Day located?
Mark Day practices at 6147 State Route 122 Ste 110, Middletown, OH 45005. The listed phone number is (513) 261-3500.
What is Mark Day's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Mark Day enrolled in Medicare?
Yes. Mark Day is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Mark Day's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Day reassigns Medicare benefits to 2 organizations: Kettering Independent Medical Group Inc (Miamisburg, OH) and Dayton Osteopathic Hospital (Dayton, OH). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Day's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Day accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and CareSource and 4 other insurers list Mark Day as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Mark Day affiliated with any hospitals?
According to CMS data, Mark Day is affiliated with Kettering Health Dayton.
When was this NPI record last updated?
The NPPES record for Mark Day was last updated on February 1, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Mark W Day, D.O · NPI 1225050560
Obstetrics & Gynecology physician in Middletown, Ohio. Individual provider, active in the CMS NPPES registry since July 24, 2006.
## Identity
- **NPI:** 1225050560 (Entity type: Individual)
- **Enumerated:** July 24, 2006
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 34.007014 (Ohio)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 6147 STATE ROUTE 122 STE 110, Middletown, OH 45005-5201
- **Phone:** (513) 261-3500 · **Fax:** (513) 261-3509
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Kettering Independent Medical Group Inc (NPI 1629387865, Miamisburg, OH); Dayton Osteopathic Hospital (NPI 1053386102, Dayton, OH) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Des Moines University Of Osteopathic Medicine And Health Sciences, class of 1995
## Record status
- **NPPES last updated:** February 1, 2021
- **Other identifiers:** Medicaid 2118505 (OH)
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Source: [NPI Profile](https://npiprofile.com/npi/1225050560) · Data from the CMS NPPES public registry.