Dr. Thomas C O'neil , MD
Ophthalmology • Tracy, CA
303 W Eaton Ave
Tracy, CA 95376
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 February 9, 2006; this date does not establish years in practice.
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Published CMS data list 756 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: 144 service units.
- 95060 — Test for allergy using allergenic extract applied to eye: 113 service units.
- 92134 — Imaging of retina: 112 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 11 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 397 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 — 105 prescription fills, including refills.
- Dorzolamide-Timolol (Dorzolamide Hcl/Timolol Maleat) — 46 prescription fills, including refills.
- Timolol Maleate — 42 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 12 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 70% of clinicians listed under Ophthalmology in California (2024, 1,572 clinicians with data). Median for this group: 1,776. Middle half: 600 to 3,873.
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 531 in 2020 to 756 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
303 W Eaton Ave
Tracy, CA 95376
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
University Of Iowa, Rj & L Carver College Of Medicine
1978
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
138 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 $46,724 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 $32,095 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
717 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
$33,005 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.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
Years since graduation
48 years (graduated 1978)
CMS Doctors and Clinicians data list 1978 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
2006
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. O'Neil 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. O'Neil 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 Tracy and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 70% of clinicians listed under Ophthalmology in California (2024, 1,572 clinicians with data). Median for this group: 1,776. Middle half: 600 to 3,873.
Too few clinicians listed under Ophthalmology in Tracy have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A lower Medicare-allowed amount than 75% of clinicians listed under Ophthalmology in California (2024, 1,572 clinicians with data). Median for this group: $209,264. Middle half: $67,828 to $437,264.
Too few clinicians listed under Ophthalmology in Tracy have Medicare Part B data for 2024 to compare.
Paid by Medicare
A lower Medicare payment amount than 75% of clinicians listed under Ophthalmology in California (2024, 1,572 clinicians with data). Median for this group: $152,036. Middle half: $48,721 to $320,363.
Too few clinicians listed under Ophthalmology in Tracy have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
Fewer Part D prescriptions than 65% of clinicians listed under Ophthalmology in California (2024, 1,966 clinicians with data). Median for this group: 1,025. Middle half: 297 to 2,233.
Too few clinicians listed under Ophthalmology in Tracy have Medicare Part D data for 2024 to compare.
Part D drug cost
A lower Part D drug cost than 60% of clinicians listed under Ophthalmology in California (2024, 1,966 clinicians with data). Median for this group: $79,352. Middle half: $13,075 to $224,408.
Too few clinicians listed under Ophthalmology in Tracy have Medicare Part D data for 2024 to compare.
3 active clinicians are listed under Ophthalmology with a practice address in Tracy, CA (2,902 in California).
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 42% from 531 in 2020 to 756 in 2024.
- 2020: 531
- 2021: 796
- 2022: 741
- 2023: 940
- 2024: 756
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Medicare-allowed amount
Medicare-allowed amount increased 45% from $32,264 in 2020 to $46,724 in 2024.
- 2020: $32,264
- 2021: $48,656
- 2022: $42,524
- 2023: $56,036
- 2024: $46,724
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Paid by Medicare
Paid by Medicare increased 44% from $22,315 in 2020 to $32,095 in 2024.
- 2020: $22,315
- 2021: $35,337
- 2022: $28,221
- 2023: $41,008
- 2024: $32,095
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 14% from 349 in 2020 to 397 in 2024.
- 2020: 349
- 2021: 366
- 2022: 273
- 2023: 319
- 2024: 397
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30-day fills
30-day fills increased 27% from 567 in 2020 to 717 in 2024.
- 2020: 567
- 2021: 596
- 2022: 439
- 2023: 534
- 2024: 717
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Part D drug cost
Part D drug cost decreased 23% from $42,955 in 2020 to $33,005 in 2024.
- 2020: $42,955
- 2021: $43,441
- 2022: $10,807
- 2023: $25,062
- 2024: $33,005
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
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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144 | 103 | $168.00 | $130.31 |
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95060
Test for allergy using allergenic extract applied to eye
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113 | 103 | $80.00 | $41.97 |
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92134
Imaging of retina
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112 | 102 | $90.00 | $38.87 |
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92025
Ct scan of cornea
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99 | 95 | $100.00 | $36.63 |
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92202
Extended exam of the back part of the eye with optic nerve drawing
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84 | 84 | $45.00 | $15.59 |
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92083
Exam of visual field with extended testing
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42 | 39 | $125.00 | $66.30 |
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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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39 | 29 | $107.00 | $92.51 |
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76514
Ultrasound scan of cornea to determine thickness
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34 | 33 | $24.00 | $10.80 |
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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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32 | 32 | $278.00 | $168.51 |
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92201
Extended exam of the back part of the eye with retinal drawing
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31 | 31 | $75.00 | $25.10 |
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92250
Photography of the retina
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26 | 25 | $100.00 | $38.36 |
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 | 105 | 6,957 | $1,495.07 | 33 |
| Dorzolamide-Timolol | Dorzolamide Hcl/Timolol Maleat | 46 | 2,945 | $812.02 | 12 |
| Timolol Maleate | Timolol Maleate | 42 | 2,269 | $585.70 | 15 |
| Prednisolone Acetate | Prednisolone Acetate | 38 | 1,091 | $1,046.21 | 29 |
| Brimonidine Tartrate | Brimonidine Tartrate | 37 | 2,027 | $1,505.88 | 11 |
| Betaxolol Hcl | Betaxolol Hcl | 24 | 1,175 | $1,250.83 | — |
| Brimonidine Tartrate-Timolol | Brimonidine Tartrate/Timolol | 23 | 815 | $4,434.22 | — |
| Lumigan | Bimatoprost | 21 | 713 | $6,289.37 | — |
| Minocycline Hcl | Minocycline Hcl | 18 | 550 | $246.61 | — |
| Dorzolamide Hcl | Dorzolamide Hcl | 15 | 695 | $221.28 | — |
| Rhopressa | Netarsudil Mesylate | 14 | 480 | $4,943.52 | — |
| Rocklatan | Netarsudil Mesylat/Latanoprost | 14 | 1,033 | $10,173.82 | — |
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: 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.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - OPHTHALMOLOGY
I20110513000025
CA
7315002888
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Career & Practice History
NPI enumerated February 09, 2006.
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
Other Ophthalmology Specialists in Tracy
Healthcare providers in TracyMailing Address
Po Box 986
Woodbridge, CA 952580986
Phone: 2098361155