Dr. Arthur J Kohn , MD
Ophthalmology • Chicago, IL
6801 N California Ave
Chicago, IL 606454512
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 22, 2006; this date does not establish years in practice.
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Published CMS data list 98 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:
- Dorzolamide-Timolol (Dorzolamide Hcl/Timolol Maleat) — 28 prescription fills, including refills.
- Ketorolac Tromethamine — 22 prescription fills, including refills.
- Tobramycin-Dexamethasone (Tobramycin/Dexamethasone) — 19 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 5 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 75% of clinicians listed under Ophthalmology in Chicago, IL (2024, 180 clinicians with data). Median for this group: 387. Middle half: 133 to 1,297.
Fewer Part D prescriptions than 85% of clinicians listed under Ophthalmology in Illinois (2024, 570 clinicians with data). Median for this group: 891. Middle half: 294 to 1,971.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 157 in 2020 to 98 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
6801 N California Ave
Chicago, IL 606454512
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
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
$3,038 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.
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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.
Compared with the same specialty in Chicago and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 75% of clinicians listed under Ophthalmology in Chicago, IL (2024, 180 clinicians with data). Median for this group: 387. Middle half: 133 to 1,297.
Fewer Part D prescriptions than 85% 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 lower Part D drug cost than 75% of clinicians listed under Ophthalmology in Chicago, IL (2024, 180 clinicians with data). Median for this group: $21,351. Middle half: $3,118 to $119,759.
A lower Part D drug cost than 85% 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.
309 active clinicians are listed under Ophthalmology with a practice address in Chicago, IL (898 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Chicago
1.3% of these 309 clinicians have the CMS telehealth indicator.
53.1% of these 309 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 D prescriptions
Medicare Part D prescriptions decreased 38% from 157 in 2020 to 98 in 2024.
- 2020: 157
- 2021: 131
- 2022: 166
- 2023: 131
- 2024: 98
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30-day fills
30-day fills decreased 43% from 203 in 2020 to 115 in 2024.
- 2020: 203
- 2021: 184
- 2022: 216
- 2023: 181
- 2024: 115
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Part D drug cost
Part D drug cost decreased 64% from $8,416 in 2020 to $3,038 in 2024.
- 2020: $8,416
- 2021: $6,701
- 2022: $11,687
- 2023: $10,953
- 2024: $3,038
Sources: 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.
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 |
|---|---|---|---|---|---|
| Dorzolamide-Timolol | Dorzolamide Hcl/Timolol Maleat | 28 | 1,109 | $621.27 | — |
| Ketorolac Tromethamine | Ketorolac Tromethamine | 22 | 636 | $195.64 | 13 |
| Tobramycin-Dexamethasone | Tobramycin/Dexamethasone | 19 | 477 | $995.66 | 11 |
| Latanoprost | Latanoprost | 17 | 608 | $134.48 | — |
| Loteprednol Etabonate | Loteprednol Etabonate | 12 | 309 | $1,091.06 | — |
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
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Optometrist
Doctor of Optometry
Ophthalmology
Doctor of Medicine (M.D.)
Ophthalmology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated August 22, 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 Chicago
- Dr. David Greenberg, MD
- Dr. Volodymyr Didorchuk, MD
- Dr. Peter Wu, MD
- Jerry Hai
- Dr. Michael Tseng, MD
- Dr. Melvyn Gerstein, MD
Mailing Address
6801 N California Ave
Chicago, IL 606454512
Phone: 7737434300