Dr. William Wen-Long Yang , MD
Ophthalmology โข Springfield, IL
2020 W Iles Ave
Springfield, IL 627047015
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 August 29, 2007; this date does not establish years in practice.
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Published CMS data list 788 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:
- 92014 โ Established patient complete exam of visual system: 205 service units.
- 92136 โ Measurement of corneal curvature and depth of eye: 172 service units.
- 92012 โ Established patient problem focused exam of visual system: 151 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 1,574 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 500 prescription fills, including refills.
- Ketorolac Tromethamine โ 348 prescription fills, including refills.
- Ofloxacin โ 346 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 15 records in the table ยท 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 Springfield, IL (2024, 16 clinicians with data). Median for this group: 1,517. Middle half: 709 to 7,850.
Fewer 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 1,732 in 2020 to 788 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
2020 W Iles Ave
Springfield, IL 627047015
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Walla Walla, WA. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 2 distinct group names: Andrew S Edwards Md Pllc; Prairie Eye Center, Ltd. 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
University Of Wisconsin School Of Medicine
2004
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
389 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 $143,755 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 $107,239 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
2,115 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
$716,648 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: $5,951.45 across 20 records.
By nature of payment
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program: $5,445.00 across 3 records.
- Food and Beverage: $506.45 across 17 records.
Reporting-company totals (3 largest of 8)
- Vifor Pharma, Inc.: $5,504.15 across 5 records.
- Tarsus Pharmaceuticals, Inc.: $220.43 across 5 records.
- Bausch & Lomb Americas Inc.: $97.16 across 5 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
22 years (graduated 2004)
CMS Doctors and Clinicians data list 2004 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
2007
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. Yang 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. Yang 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 Springfield and Illinois
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 Springfield, IL (2024, 16 clinicians with data). Median for this group: 1,517. Middle half: 709 to 7,850.
Fewer 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.
Medicare-allowed amount
A lower Medicare-allowed amount than 65% of clinicians listed under Ophthalmology in Springfield, IL (2024, 16 clinicians with data). Median for this group: $213,217. Middle half: $99,012 to $569,763.
A lower Medicare-allowed amount than 60% 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.
Paid by Medicare
A lower Medicare payment amount than 65% of clinicians listed under Ophthalmology in Springfield, IL (2024, 16 clinicians with data). Median for this group: $154,907. Middle half: $67,838 to $440,296.
A lower Medicare payment amount than 60% 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.
Medicare Part D prescriptions
More Part D prescriptions than 65% of clinicians listed under Ophthalmology in Springfield, IL (2024, 17 clinicians with data). Median for this group: 881. Middle half: 227 to 1,991.
More Part D prescriptions than 65% of clinicians listed under Ophthalmology in Illinois (2024, 570 clinicians with data). Median for this group: 891. Middle half: 294 to 1,971.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Ophthalmology in Springfield, IL (2024, 17 clinicians with data). Median for this group: $44,196. Middle half: $13,362 to $259,055.
A higher Part D drug cost than 95% 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.
25 active clinicians are listed under Ophthalmology with a practice address in Springfield, IL (898 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Springfield
4% of these 25 clinicians have the CMS telehealth indicator.
52% of these 25 clinicians are listed by CMS as accepting Medicare assignment.
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 decreased 55% from 1,732 in 2020 to 788 in 2024.
- 2020: 1,732
- 2021: 2,623
- 2022: 1,249
- 2023: 1,055
- 2024: 788
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Medicare-allowed amount
Medicare-allowed amount decreased 44% from $256,906 in 2020 to $143,755 in 2024.
- 2020: $256,906
- 2021: $245,760
- 2022: $185,409
- 2023: $184,413
- 2024: $143,755
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Paid by Medicare
Paid by Medicare decreased 44% from $191,499 in 2020 to $107,239 in 2024.
- 2020: $191,499
- 2021: $186,450
- 2022: $138,542
- 2023: $136,573
- 2024: $107,239
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 19% from 1,946 in 2020 to 1,574 in 2024.
- 2020: 1,946
- 2021: 2,101
- 2022: 1,920
- 2023: 1,871
- 2024: 1,574
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30-day fills
30-day fills decreased 16% from 2,506 in 2020 to 2,115 in 2024.
- 2020: 2,506
- 2021: 2,650
- 2022: 2,428
- 2023: 2,388
- 2024: 2,115
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Part D drug cost
Part D drug cost increased 148% from $289,174 in 2020 to $716,648 in 2024.
- 2020: $289,174
- 2021: $312,068
- 2022: $640,444
- 2023: $811,143
- 2024: $716,648
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $224.36 in 2021 to $5,951.45 in 2025.
- 2021: $224.36
- 2022: $193.57
- 2023: $419.36
- 2024: $2,386.22
- 2025: $5,951.45
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): 20 records totaling $5,951.45.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Vifor Pharma, Inc. |
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
|
Veltassa | General | $1,815.00 |
| Vifor Pharma, Inc. |
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
|
Veltassa | General | $1,815.00 |
| Vifor Pharma, Inc. |
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program
Cash or cash equivalent
|
Veltassa | General | $1,815.00 |
| Tarsus Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
XDEMVY | General | $123.05 |
| Glaukos Corporation |
Food and Beverage
Cash or cash equivalent
|
Photrexa Viscous and Photrexa | General | $40.07 |
| Vifor Pharma, Inc. |
Food and Beverage
In-kind items and services
|
Veltassa | General | $32.99 |
| Astellas Pharma US Inc |
Food and Beverage
In-kind items and services
|
Izervay | General | $31.48 |
| Vifor Pharma, Inc. |
Food and Beverage
In-kind items and services
|
Veltassa | General | $26.16 |
| Tarsus Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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XDEMVY | General | $25.08 |
| SUN PHARMACEUTICAL INDUSTRIES INC. |
Food and Beverage
In-kind items and services
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Cequa | General | $24.60 |
| Tarsus Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
XDEMVY | General | $24.58 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
|
MIEBO | General | $24.48 |
| Tarsus Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
XDEMVY | General | $23.86 |
| Tarsus Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
XDEMVY | General | $23.86 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
|
MIEBO | General | $21.40 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
Rocklatan | General | $17.86 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
|
VYZULTA | General | $17.82 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
|
VYZULTA | General | $17.76 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
|
VYZULTA | General | $15.70 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
OZURDEX | General | $15.70 |
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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92014
Established patient complete exam of visual system
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205 | 201 | $294.00 | $122.96 |
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92136
Measurement of corneal curvature and depth of eye
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172 | 86 | $220.81 | $34.55 |
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92012
Established patient problem focused exam of visual system
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151 | 111 | $168.00 | $87.69 |
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66984
Removal of cataract with insertion of prosthetic lens
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113 | 72 | $2730.00 | $538.97 |
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92004
New patient complete exam of visual system
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79 | 79 | $352.00 | $146.87 |
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66984
Removal of cataract with insertion of prosthetic lens
|
34 | 22 | $2730.00 | $542.50 |
|
66821
Removal of recurring cataract in lens capsule using a laser
|
23 | 23 | $973.39 | $348.67 |
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92133
Imaging of optic nerve
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11 | 11 | $90.00 | $35.83 |
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 | 500 | 16,942 | $13,219.21 | 284 |
| Ketorolac Tromethamine | Ketorolac Tromethamine | 348 | 9,125 | $4,298.79 | 222 |
| Ofloxacin | Ofloxacin | 346 | 9,273 | $3,047.25 | 221 |
| Cyclosporine | Cyclosporine | 75 | 5,370 | $37,705.47 | 35 |
| Restasis | Cyclosporine | 70 | 4,320 | $84,307.14 | 35 |
| Xiidra | Lifitegrast | 50 | 3,540 | $81,186.82 | 22 |
| Valacyclovir | Valacyclovir Hcl | 42 | 1,995 | $1,246.76 | 11 |
| Loteprednol Etabonate | Loteprednol Etabonate | 25 | 1,215 | $2,700.05 | โ |
| Latanoprost | Latanoprost | 24 | 1,313 | $157.29 | โ |
| Acyclovir | Acyclovir | 21 | 1,041 | $180.22 | โ |
| Lumigan | Bimatoprost | 21 | 1,204 | $10,972.32 | โ |
| Oxervate | Cenegermin-Bkbj | 17 | 238 | $475,539.36 | โ |
| Dorzolamide-Timolol | Dorzolamide Hcl/Timolol Maleat | 13 | 745 | $136.64 | โ |
| Timolol Maleate | Timolol Maleate | 11 | 865 | $108.45 | โ |
| Fml | Fluorometholone | 11 | 300 | $1,842.17 | โ |
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: 2026-02-22NUCC 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
I20260225000204
WA
9638227614
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
Prairie Eye Center, Ltd
2020 W Iles Ave, Springfield, IL 627044174
Phone: 2176983030
Andrew S Edwards Md Pllc
299 W Tietan St, Walla Walla, WA 993624363
Phone: 5095252100
Secondary Practice Locations
299 W Tietan St
Walla Walla, WA 993624363
Phone: 5095252100
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
Doctor of Medicine (M.D.)
Optometrist
Doctor of Optometry
Optometrist
Doctor of Optometry
Ophthalmology
Doctor of Medicine (M.D.)
Optometrist
Doctor of Optometry
Optometrist
Doctor of Optometry
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 299 W TIETAN ST, WALLA WALLA, WA 993624363 (Tel: 5095252100)
NPI status registered as active in NPPES database
Registered at 2020 W ILES AVE, SPRINGFIELD, IL 627047015 (Tel: 2176983030)
Registered at 2020 W ILES AVE, SPRINGFIELD, IL 627047015 (Tel: 2176983030)
Recorded as WILLIAM YANG, MD
Ophthalmology (license number reported to NPPES: IL 036126329)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Ophthalmology Specialists in Springfield
- Dr. John Kwedar, MD
- Dr. Stephen Holland, MD
- Dr. Susan Stegeman, MD
- Dr. Tomas Tredici, MD
- Dr. Robert Lowenthal, MD
- Dr. Mohammad Sadiq, MD
Mailing Address
299 W Tietan St
Walla Walla, WA 993624363
Phone: 5095252100