NPI registry status
Active
2026 NPPES data Obstetrics & Gynecology Physician NPI 1225050560 D.O
Verify on CMS → Mark Day, D.O
Obstetrics & Gynecology Physician in Middletown, Ohio.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 44,326 in Obstetrics & Gynecology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
219
Medicare Part D claims · 54 beneficiaries · Obstetrics & Gynecology Physician avg: 179
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
78.9/100
▼ 5 pts below national avg 83.5 · Above neutral
Industry payments
$96.98
4 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Mark Day, D.O reported a CMS MIPS final score of 78.9/100 - below the 83.5 national average - and filed 219 Medicare Part D claims in 2023.
- 78.9/100
- MIPS score · -5 vs avg
- 219
- Part D claims, 2023
- 81%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Mark Day, D.O
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1225050560), first enumerated 07/24/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 219 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 78.9/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$96.98 in reported industry payments (4 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
Ohio statewide board action statistics are published annually — these figures describe aggregate state activity, not Mark Day, D.O's individual license status. Verify directly with the state medical board.
Source: OMB annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1225050560 · Obstetrics & Gynecology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-BELOW · RX-LIGHT · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1225050560
- ENUM-LEGACY 2006
- TAX-MID 44K Obstetrics &
- MIPS-BELOW 78.9/100
- RX-LIGHT 219
- BOOK-LIGHT 1,501 in Ohio
- PHOTO-FINISH Yi Li · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Day · this provi…
Day · this provider
78.9 MIPS pts
- Susan Marzolf · …
Susan Marzolf
78.9 MIPS pts
- Janelle Evans · …
Janelle Evans
78.9 MIPS pts
- Yi Li · near
Yi Li
78.9 MIPS pts
- James Macdonald …
James Macdonald
78.9 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Mark Day, D.O's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
79 ≥ 23rd percentile 23% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Mark Day, D.O sits
This provider among obstetrics & gynecology physician peers
Across the 7,360 obstetrics & gynecology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Mark Day, D.O writes more Part D claims than 77% of them and scores higher on MIPS quality than 23% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one obstetrics & gynecology physician peer from a representative sample of 60; the gold marker is Mark Day, D.O. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Mark Day, D.O practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mark Day, D.O?
Near national averagePrimary specialty
Obstetrics & Gynecology Physician
Medicare Part D claims
219 22% vs specialty avg
MIPS final score
78.9/100 4.6 pts vs avg
Specialty distribution in Ohio
How Obstetrics & Gynecology Physician compares to other specialties among Ohio providers
Medicare quality performance, MIPS
Mark Day, D.O's 2023 MIPS final score plotted against the Obstetrics & Gynecology Physician national average
- MIPS Final Score
- 78.9/100
- vs 83.5 national avg · 2023 performance year
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1225050560 |
|---|---|
| Specialty | Obstetrics & Gynecology Physician |
| Credentials | D.O |
| Gender | Male |
| NPI Issued | 07/24/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
78.9373
Final Score
Measured-score avg: 83.5
69.8099
Quality
59.9811
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Mark Day, D.O bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Dayton Osteopathic Hospital
Dayton, OH
Kettering Independent Medical Group Inc
Kettering, OH
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Mark Day, D.O. Source: openpaymentsdata.cms.gov.
Total received
$97
Largest payer
Medical Device Business Services, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - Ohio OMB 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~48K Ohio medical licensees in 2023 - they are NOT specific to Mark Day, D.O. To verify Mark Day, D.O's current license status, search the OMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
158
Total board actions, Ohio 2023
Across 154 cases
3.29
Actions per 1,000 licensees
Ohio statewide rate
probation
Most common action type
56 cases
OMB publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Ohio disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Mark Day, D.O - brand share 19.0%
Obstetrics & Gynecology Physician average
19% brand-name claims vs 81% generic, on 219 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
219
Total Claims
$11K
Total Drug Cost
54
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 348
- Total Day Supply
- 9,061
- Brand vs Generic
- 19% brand / 81% generic
- Brand Drug Cost
- $7K
- Generic Drug Cost
- $4K
- Antibiotic Claims
- 13
Patient Demographics
- Average Patient Age
- 54.7 years
- Avg HCC Risk Score
- 1.09
- Gender Split
- 100% female / 0% male
- Age Distribution
- <65: 33, 65-74: 17, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Day, D.O prescribes most
Top Medicare Part D drugs by claim count, 2023
- Estradiol
Estradiol
32 claims
- Medroxyprogesteron…
Medroxyprogesterone Acetate
21 claims
- Estarylla
Estarylla
16 claims
- Fluconazole
Fluconazole
13 claims
- Lo Loestrin Fe
Lo Loestrin Fe
13 claims
| Drug | Claims |
|---|---|
| Estradiol | 32 |
| Medroxyprogesterone Acetate | 21 |
| Estarylla Norgestimate-Ethinyl Estradiol | 16 |
| Fluconazole | 13 |
| Lo Loestrin Fe Norethindrone-E.Estradiol-Iron | 13 |
| Premarin "Estrogens | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Obstetrics & Gynecology Physician Overview
How Mark Day, D.O fits within the Obstetrics & Gynecology Physician landscape nationally.
44,326
Obstetrics & Gynecology Physician Providers in US
56
States with Obstetrics & Gynecology Physician
179
Avg Claims per Provider
Mark Day, D.O's 219 claims are above the specialty average of 179.
Nationwide Obstetrics & Gynecology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Day, both outside Ohio so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (78.9 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Obstetrics & Gynecology Physician Providers in Ohio
Other clinicians with the same primary specialty enrolled in Ohio, drawn from the same CMS NPPES roster as Day.
One of 1,501 Obstetrics & Gynecology Physician providers enrolled in Ohio, 5 are shown here.
Dr. George Abate
D.O.
Findlay, OH
Dr. Mahmoud Abdelwahab
MD
Columbus, OH
Dr. Amine Abdul-Aal
M.D.
Warren, OH
Dr. Megan Abrams
MD
Cleveland, OH
Dr. Tiffany Abreu
M.D.
Hilliard, OH
Compare Obstetrics & Gynecology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mark Day, D.O's specialty? ▼
Mark Day, D.O specializes in Obstetrics & Gynecology Physician and practices in Middletown, Ohio. Credentials: D.O.
How much does Mark Day, D.O prescribe under Medicare Part D? ▼
In 2023, Mark Day, D.O wrote 219 Medicare Part D claims totaling $11K in drug costs for 54 beneficiaries.
What is Mark Day, D.O's Medicare quality score? ▼
Mark Day, D.O has a CMS MIPS Final Score of 78.9/100 (Quality: 69.8, Cost: 60). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mark Day, D.O located? ▼
Mark Day, D.O is located at 6147 STATE ROUTE 122 STE 110, Middletown, OH, 45005. Phone: (513) 261-3500.
What is Mark Day, D.O's NPI number? ▼
Mark Day, D.O's National Provider Identifier (NPI) is 1225050560, issued on 07/24/2006.
Does Mark Day, D.O prescribe more brand-name or generic drugs? ▼
Mark Day, D.O's prescribing is 19% brand-name and 81% generic drugs by claim count, with $7K in brand drug costs.
How many Obstetrics & Gynecology Physician providers are there in the US? ▼
There are 44,326 Obstetrics & Gynecology Physician providers across 56 states in the US. The average Obstetrics & Gynecology Physician provider writes 179 Medicare Part D claims per year.
What drugs does Mark Day, D.O prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Day, D.O's most frequently prescribed drugs include Estradiol, Medroxyprogesterone Acetate, Estarylla. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Day, D.O accept Medicare? ▼
Mark Day, D.O appears in CMS Medicare data with 219 Part D claims and 54 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Day, D.O's credentials? ▼
Mark Day, D.O's NPI is 1225050560 with credentials D.O. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.