Quick answers
- Does Marshall P. Day accept Medicare assignment?
- Yes. Medicare's clinician data says Marshall P. Day accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Marshall P. Day see?
- In 2024, CMS data shows 323 Original Medicare patients and 501 services for Marshall P. Day. This counts Original Medicare only and measures volume, not quality.
- What is Marshall P. Day's NPI number?
- 1588614960. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Marshall P. Day, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 323 |
|---|---|
| Services billed to Medicare | 501 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient complete exam of visual system (92014)215 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)54 services
- Imaging of retina (92134)44 services
- Photography of the retina (92250)40 services
- New patient complete exam of visual system (92004)35 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol71%
- Arthritis50%
- Ischemic heart disease35%
- Diabetes33%
- Chronic kidney disease22%
Practice locations
Addresses where Marshall P. Day is enrolled with Medicare (CMS data updated October 2, 2026).
- 129 N Bradley StWeatherford, OK 73096 (580) 772‑3232
- 565 S 30th StClinton, OK 73601 (580) 323‑5421
Group practices
Medicare enrollment lists Marshall P. Day as a member of this group (CMS data updated October 2, 2026).
- Allard Eye Care PLLC2 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Weatherford
Clinicians with the same Medicare primary specialty in Weatherford, OK — not a recommendation.
Other clinicians in Allard Eye Care PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Southern College Of Optometry |
| Graduation year | 1977 (49 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588614960 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians