Dr. Michael Vincent Stock , MD
Ophthalmology โข O Fallon, IL
705 Insight Ave
O Fallon, IL 622692146
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 June 18, 2012; this date does not establish years in practice.
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Published CMS data list 4,200 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 92136 โ Measurement of corneal curvature and depth of eye: 1,195 service units.
- 66984 โ Removal of cataract with insertion of prosthetic lens: 1,085 service units.
- 99204 โ New patient outpatient office visit: 783 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ 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 8 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 296 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Prednisolone Acetate โ 96 prescription fills, including refills.
- Latanoprost โ 47 prescription fills, including refills.
- Dorzolamide-Timolol (Dorzolamide Hcl/Timolol Maleat) โ 41 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 8 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 75% of clinicians listed under Ophthalmology in Illinois (2024, 519 clinicians with data). Median for this group: 1,942. Middle half: 813 to 3,689.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 1,833 in 2020 to 4,200 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
705 Insight Ave
O Fallon, IL 622692146
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 3 distinct additional practice-address records in Effingham, IL; Saint Louis, MO; Taylorville, IL. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 2 distinct group names: Ideal Eye Surgery Llc; Washington University. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Washington University School Of Medicine
2012
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
1,060 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 โ by Provider, 2024.
Medicare-allowed amount
About $848,722 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 โ by Provider and Service, 2024.
Paid by Medicare
About $638,292 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 โ by Provider and Service, 2024.
30-day fills
438 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
$4,890 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 โ by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $1,314.94 across 29 records.
By nature of payment
- Food and Beverage: $1,276.08 across 28 records.
- Honoraria: $38.86 across 1 record.
Reporting-company totals (3 largest of 9)
- Alcon Vision LLC: $656.09 across 15 records.
- Glaukos Corporation: $237.54 across 4 records.
- Bausch & Lomb Americas Inc.: $160.69 across 2 records.
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
14 years (graduated 2012)
CMS Doctors and Clinicians data list 2012 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
2012
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, โDoes your provider accept Medicare as full payment?โ
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. Stock 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. Stock 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 O Fallon and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 75% of clinicians listed under Ophthalmology in Illinois (2024, 519 clinicians with data). Median for this group: 1,942. Middle half: 813 to 3,689.
Too few clinicians listed under Ophthalmology in O Fallon have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 85% of clinicians listed under Ophthalmology in Illinois (2024, 519 clinicians with data). Median for this group: $217,562. Middle half: $82,211 to $445,105.
Too few clinicians listed under Ophthalmology in O Fallon have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 85% of clinicians listed under Ophthalmology in Illinois (2024, 519 clinicians with data). Median for this group: $156,041. Middle half: $58,651 to $322,257.
Too few clinicians listed under Ophthalmology in O Fallon have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
Fewer Part D prescriptions than 70% of clinicians listed under Ophthalmology in Illinois (2024, 570 clinicians with data). Median for this group: 891. Middle half: 294 to 1,971.
Too few clinicians listed under Ophthalmology in O Fallon have Medicare Part D data for 2024 to compare.
Part D drug cost
A lower Part D drug cost than 80% of clinicians listed under Ophthalmology in Illinois (2024, 570 clinicians with data). Median for this group: $71,776. Middle half: $10,407 to $185,387.
Too few clinicians listed under Ophthalmology in O Fallon have Medicare Part D data for 2024 to compare.
5 active clinicians are listed under Ophthalmology with a practice address in O Fallon, IL (898 in Illinois).
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 129% from 1,833 in 2020 to 4,200 in 2024.
- 2020: 1,833
- 2021: 2,383
- 2022: 2,915
- 2023: 4,362
- 2024: 4,200
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Medicare-allowed amount
Medicare-allowed amount increased 117% from $391,520 in 2020 to $848,722 in 2024.
- 2020: $391,520
- 2021: $534,883
- 2022: $622,648
- 2023: $872,836
- 2024: $848,722
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Paid by Medicare
Paid by Medicare increased 112% from $300,408 in 2020 to $638,292 in 2024.
- 2020: $300,408
- 2021: $415,311
- 2022: $479,758
- 2023: $669,213
- 2024: $638,292
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 1038% from 26 in 2020 to 296 in 2024.
- 2020: 26
- 2021: 77
- 2022: 53
- 2023: 151
- 2024: 296
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30-day fills
30-day fills increased 1414% from 29 in 2020 to 438 in 2024.
- 2020: 29
- 2021: 84
- 2022: 58
- 2023: 217
- 2024: 438
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Part D drug cost
Part D drug cost increased 31% from $3,729 in 2020 to $4,890 in 2024.
- 2020: $3,729
- 2021: $9,232
- 2022: $1,597
- 2023: $3,638
- 2024: $4,890
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $622.57 in 2021 to $1,314.94 in 2025.
- 2021: $622.57
- 2022: $578.50
- 2023: $215.63
- 2024: $830.45
- 2025: $1,314.94
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 ยท 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 โ December 31, 2025): 29 records totaling $1,314.94.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Glaukos Corporation |
Food and Beverage
Cash or cash equivalent
|
iStent infinite | General | $193.24 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
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UNITY | General | $149.03 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
HYDRUS Microstent | General | $140.35 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
Clareon | General | $136.16 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
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INFUSE | General | $122.83 |
| CooperVision Inc. |
Food and Beverage
In-kind items and services
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MyDay Contact Lens | General | $74.23 |
| RxSight Inc |
Honoraria
In-kind items and services
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RXSIGHT CONTACT LENS | General | $38.86 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
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INFUSE | General | $37.86 |
| Oyster Point Pharma, Inc. |
Food and Beverage
In-kind items and services
|
TYRVAYA | General | $29.77 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
UNITY | General | $29.53 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
Clareon | General | $28.31 |
| Johnson & Johnson Surgical Vision, Inc. |
Food and Beverage
In-kind items and services
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TECNIS IOL | General | $27.47 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
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UNITY | General | $26.17 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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DURYSTA | General | $25.97 |
| Johnson & Johnson Surgical Vision, Inc. |
Food and Beverage
In-kind items and services
|
Tecnis Simplicity | General | $25.38 |
| Glaukos Corporation |
Food and Beverage
Cash or cash equivalent
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iStent infinite | General | $23.58 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
UNITY | General | $22.40 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
UNITY | General | $22.18 |
| Carl Zeiss Meditec USA, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $21.79 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
UNITY | General | $19.96 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
UNITY | General | $18.51 |
| Glaukos Corporation |
Food and Beverage
Cash or cash equivalent
|
iDoseTR | General | $18.49 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
Clareon PanOptix Pro | General | $17.88 |
| RxSight Inc |
Food and Beverage
In-kind items and services
|
RXSIGHT CONTACT LENS | General | $17.15 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
Clareon | General | $14.75 |
(top 25 shown)
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ2023 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 โ by Provider and Service data, 2017โ2024; 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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92136
Measurement of corneal curvature and depth of eye
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1,195 | 801 | $150.00 | $37.19 |
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66984
Removal of cataract with insertion of prosthetic lens
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1,085 | 665 | $2007.37 | $429.18 |
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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
|
783 | 783 | $340.00 | $160.97 |
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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
|
612 | 584 | $215.00 | $121.96 |
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66821
Removal of recurring cataract in lens capsule using a laser
|
269 | 188 | $1000.00 | $267.63 |
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66982
Complex removal of cataract with insertion of prosthetic lens
|
100 | 77 | $2511.00 | $606.82 |
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92134
Imaging of retina
|
85 | 85 | $120.00 | $35.69 |
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92133
Imaging of optic nerve
|
71 | 71 | $100.00 | $31.45 |
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 |
|---|---|---|---|---|---|
| Prednisolone Acetate | Prednisolone Acetate | 96 | 2,528 | $2,439.36 | 79 |
| Latanoprost | Latanoprost | 47 | 2,626 | $450.27 | 18 |
| Dorzolamide-Timolol | Dorzolamide Hcl/Timolol Maleat | 41 | 2,580 | $556.06 | 32 |
| Timolol Maleate | Timolol Maleate | 37 | 1,957 | $233.08 | 21 |
| Ketorolac Tromethamine | Ketorolac Tromethamine | 29 | 884 | $363.66 | 20 |
| Brimonidine Tartrate | Brimonidine Tartrate | 16 | 589 | $457.15 | 12 |
| Moxifloxacin | Moxifloxacin Hcl | 16 | 248 | $300.38 | 12 |
| Acetazolamide Er | Acetazolamide | 14 | 67 | $90.21 | 14 |
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
Self-certified to NPPES: 2025-12-11NUCC Taxonomy Code: 207W00000X
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
NUCC Taxonomy Code: 207W00000X
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - OPHTHALMOLOGY
I20160801000620
IL
9830328046
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Ideal Eye Surgery Llc
705 Insight Ave, O Fallon, IL 622692146
Phone: 6183911660
Washington University
4901 Forest Park Ave, Saint Louis, MO 631081495
Phone: 3143623937
Ideal Eye Surgery Llc
12400 Olive Blvd, Creve Coeur, MO 631415436
Phone: 3143919400
Secondary Practice Locations
900 W Temple Ave Bldg A
Effingham, IL 624012121
Phone: 6183911660
201 E Pleasant St
Taylorville, IL 625681562
Phone: 6183911660
12400 Olive Blvd Ste 200
Saint Louis, MO 631415436
Phone: 3143919400
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Ophthalmology - Ophthalmic Plastic and Reconstructive Surgery
Doctor of Medicine (M.D.)
Ophthalmology
Doctor of Osteopathic Medicine (D.O.)
Ophthalmology
Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)
Ophthalmology
Doctor of Medicine (M.D.)
Ophthalmology
Doctor of Medicine (M.D.)
Optometrist
Doctor of Optometry
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 705 INSIGHT AVE, O FALLON, IL 622692146 (Tel: 6183911660)
Registered at 705 INSIGHT AVE, O FALLON, IL 622692146 (Tel: 6183911660)
Registered at PO BOX 7412011, CHICAGO, IL 606742011 (Tel: 3143623431)
Registered at PO BOX 60352, SAINT LOUIS, MO 631600352 (Tel: 3143623431)
Registered at 517 S EUCLID AVE, DEPT OPTHALMOLOGY, 1ST FL, SAINT LOUIS, MO 631101007 (Tel: 3143623431)
Registered at 660 S EUCLID AVE, CB 8096, SAINT LOUIS, MO 631101010 (Tel: 3143623431)
Registered at 1660 ESSEX WAY, STE A, O FALLON, IL 622693076 (Tel: 3143623431)
Registered at 517 S EUCLID AVE, SAINT LOUIS, MO 631101007 (Tel: 3143623431)
Registered at 660 S EUCLID AVE, CB 8096, SAINT LOUIS, MO 631101010 (Tel: 3143623431)
Recorded as MICHAEL STOCK, MD
Ophthalmology (license number reported to NPPES: MO 2016004847)
Registered at 1660 ESSEX WAY STE A, O FALLON, IL 622693076 (Tel: 6183911660)
Registered at 1660 ESSEX WAY STE A, O FALLON, IL 622693076 (Tel: 6183911660)
Registered at 1660 ESSEX WAY STE A, O FALLON, IL 622693076 (Tel: 6183911660)
Registered at 1660 ESSEX WAY STE A, O FALLON, IL 622693076 (Tel: 6183911660)
NPI status registered as active in NPPES database
Registered at 12855 NORTH FORTY DRIVE, SUITE 260, SOUTH TOWER, SAINT LOUIS, MO 63141 (Tel: 3149839800)
Registered at 12855 N 40 DR, SUITE 260, SOUTH TOWER, SAINT LOUIS, MO 631418657 (Tel: 3149839800)
Recorded as MICHAEL STOCK, M.D.
Ophthalmology (license number reported to NPPES: MO 2012018834)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Ophthalmology Specialists in O Fallon
Healthcare providers in O FallonMailing Address
705 Insight Ave
O Fallon, IL 622692146
Phone: 6183911660