Dr. Marshall Walker , OD
Optometrist • Perkins, OK
509 E Highway 33
Perkins, OK 740594129
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on May 2, 2013; this date does not establish years in practice.
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Published CMS data list 1,812 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99214 — Established patient outpatient office visit: 689 service units.
- 92134 — Imaging of retina: 438 service units.
- 92202 — Extended exam of the back part of the eye with optic nerve drawing: 294 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 13 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 251 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Latanoprost — 89 prescription fills, including refills.
- Brimonidine Tartrate — 45 prescription fills, including refills.
- Neomycin-Polymyxin-Dexameth (Neomycin/Polymyxin B/Dexametha) — 37 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 7 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 90% of clinicians listed under Optometrist in Oklahoma (2024, 570 clinicians with data). Median for this group: 395. Middle half: 171 to 778.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 676 in 2020 to 1,812 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
509 E Highway 33
Perkins, OK 740594129
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Pennsylvania College Of Optometry
2013
What Public CMS Data Show
Optometrist: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
431 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $135,364 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $89,282 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
320 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$7,828 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $315.18 across 10 records.
By nature of payment
- Food and Beverage: $315.18 across 10 records.
Reporting-company totals (3 largest of 5)
- Alcon Vision LLC: $214.84 across 6 records.
- Bausch & Lomb Americas Inc.: $35.91 across 1 record.
- Tarsus Pharmaceuticals, Inc.: $28.27 across 1 record.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
13 years (graduated 2013)
CMS Doctors and Clinicians data list 2013 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2013
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Walker has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Walker as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Perkins and Oklahoma
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 90% of clinicians listed under Optometrist in Oklahoma (2024, 570 clinicians with data). Median for this group: 395. Middle half: 171 to 778.
Too few clinicians listed under Optometrist in Perkins have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 90% of clinicians listed under Optometrist in Oklahoma (2024, 570 clinicians with data). Median for this group: $30,277. Middle half: $14,370 to $62,604.
Too few clinicians listed under Optometrist in Perkins have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 90% of clinicians listed under Optometrist in Oklahoma (2024, 570 clinicians with data). Median for this group: $20,572. Middle half: $9,649 to $42,122.
Too few clinicians listed under Optometrist in Perkins have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 70% of clinicians listed under Optometrist in Oklahoma (2024, 529 clinicians with data). Median for this group: 121. Middle half: 57 to 269.
Too few clinicians listed under Optometrist in Perkins have Medicare Part D data for 2024 to compare.
Part D drug cost
Close to the middle for clinicians listed under Optometrist in Oklahoma (2024, 529 clinicians with data). Median for this group: $9,596. Middle half: $1,308 to $29,647.
Too few clinicians listed under Optometrist in Perkins have Medicare Part D data for 2024 to compare.
1 active clinicians are listed under Optometrist with a practice address in Perkins, OK (893 in Oklahoma).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 168% from 676 in 2020 to 1,812 in 2024.
- 2020: 676
- 2021: 977
- 2022: 1,329
- 2023: 1,475
- 2024: 1,812
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Medicare-allowed amount
Medicare-allowed amount increased 101% from $67,421 in 2020 to $135,364 in 2024.
- 2020: $67,421
- 2021: $89,048
- 2022: $96,670
- 2023: $99,009
- 2024: $135,364
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Paid by Medicare
Paid by Medicare increased 93% from $46,334 in 2020 to $89,282 in 2024.
- 2020: $46,334
- 2021: $63,252
- 2022: $63,538
- 2023: $66,301
- 2024: $89,282
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 512% from 41 in 2020 to 251 in 2024.
- 2020: 41
- 2021: 116
- 2022: 210
- 2023: 175
- 2024: 251
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30-day fills
30-day fills increased 617% from 45 in 2020 to 320 in 2024.
- 2020: 45
- 2021: 153
- 2022: 264
- 2023: 238
- 2024: 320
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Part D drug cost
Part D drug cost increased 20% from $6,500 in 2020 to $7,828 in 2024.
- 2020: $6,500
- 2021: $16,808
- 2022: $22,025
- 2023: $7,623
- 2024: $7,828
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $24.97 in 2021 to $315.18 in 2025.
- 2021: $24.97
- 2022: $21.42
- 2023: $32.11
- 2024: $91.57
- 2025: $315.18
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $315.18.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
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TOTAL30 | General | $150.00 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
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INFUSE | General | $35.91 |
| Tarsus Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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XDEMVY | General | $28.27 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
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Precision7 | General | $26.76 |
| Johnson & Johnson Vision Care, Inc. |
Food and Beverage
In-kind items and services
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— | General | $19.85 |
| Dompe US, Inc. |
Food and Beverage
In-kind items and services
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OXERVATE | General | $16.31 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
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Precision7 | General | $12.23 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
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Precision7 | General | $11.22 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
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Precision7 | General | $9.10 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
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Precision7 | General | $5.53 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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689 | 373 | $140.00 | $118.90 |
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92134
Imaging of retina
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438 | 341 | $62.00 | $36.36 |
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92202
Extended exam of the back part of the eye with optic nerve drawing
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294 | 219 | $36.00 | $14.32 |
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92083
Exam of visual field with extended testing
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97 | 70 | $110.00 | $57.20 |
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68761
Closure of tear duct opening using plug
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70 | 17 | $206.46 | $144.20 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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60 | 60 | $215.00 | $155.29 |
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92133
Imaging of optic nerve
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37 | 30 | $62.00 | $31.96 |
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66984
Removal of cataract with insertion of prosthetic lens
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32 | 19 | $300.00 | $98.84 |
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92071
Fitting of contact lens for treatment of eye surface disease
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30 | 13 | $82.53 | $33.62 |
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92020
Exam of the internal drainage system of eye
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20 | 13 | $47.00 | $25.17 |
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92250
Photography of the retina
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18 | 18 | $112.00 | $33.86 |
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92060
Exam to measure eye deviation and range of motion
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15 | 11 | $70.00 | $58.03 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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12 | 12 | $95.00 | $84.10 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Latanoprost | Latanoprost | 89 | 2,549 | $827.00 | 18 |
| Brimonidine Tartrate | Brimonidine Tartrate | 45 | 2,345 | $655.56 | 12 |
| Neomycin-Polymyxin-Dexameth | Neomycin/Polymyxin B/Dexametha | 37 | 466 | $448.39 | 35 |
| Erythromycin | Erythromycin Base | 26 | 437 | $366.68 | 12 |
| Prednisolone Acetate | Prednisolone Acetate | 24 | 589 | $1,053.95 | 16 |
| Timolol Maleate | Timolol Maleate | 18 | 1,005 | $243.90 | — |
| Lumigan | Bimatoprost | 12 | 465 | $4,232.62 | — |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 152W00000X
Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.
NUCC Taxonomy Code: 390200000X
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - OPTOMETRY
I20141229001826
OK
6103149083
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Dentist - General Practice
Doctor of Dental Surgery
Physician Assistant - Medical
Physician Assistant (Certified)
Nurse Practitioner - Family
APRNFNPC
Family Medicine
Doctor of Osteopathic Medicine (D.O.)
Family Medicine
Doctor of Osteopathic Medicine (D.O.)
Family Medicine
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated May 02, 2013.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
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Mailing Address
509 E Highway 33
Perkins, OK 740594129
Phone: 4055472473