Karen Lin Chen
Physician Assistant โข Glenview, IL
3633 W Lake Ave Ste 409
Glenview, IL 600265804
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 3, 2022; this date does not establish years in practice.
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Published CMS data list 3,003 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:
- 17003 โ Destruction of precancer skin growth, 2-14 growths: 1,172 service units.
- 99213 โ Established patient outpatient office visit: 642 service units.
- 17000 โ Destruction of precancer skin growth, 1 growth: 303 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 15 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 716 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:
- Ketoconazole โ 141 prescription fills, including refills.
- Triamcinolone Acetonide โ 133 prescription fills, including refills.
- Clobetasol Propionate โ 118 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 14 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 95% of clinicians listed under Physician Assistant in Glenview, IL (2024, 21 clinicians with data). Median for this group: 452. Middle half: 163 to 921.
More Medicare Part B services than 90% of clinicians listed under Physician Assistant in Illinois (2024, 2,422 clinicians with data). Median for this group: 212. Middle half: 76 to 548.
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 4,116 in 2023 to 3,003 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2023โ2024.
Practice Location & Contact Primary Location
3633 W Lake Ave Ste 409
Glenview, IL 600265804
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 2 distinct group names: Deerfield Dermatology Associates, Ltd.; On The Spot Dermatology Pllc. 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
2022
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
799 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 $136,868 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 $89,206 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
884 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
$263,325 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: $223.20 across 10 records.
By nature of payment
- Food and Beverage: $223.20 across 10 records.
Reporting-company totals (3 largest of 5)
- ABBVIE INC.: $102.98 across 5 records.
- Amgen Inc.: $39.47 across 2 records.
- Sanofi and Genzyme US Companies: $33.90 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
4 years (graduated 2022)
CMS Doctors and Clinicians data list 2022 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
2022
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)
Karen Chen 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 Karen Chen 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 Glenview and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under Physician Assistant in Glenview, IL (2024, 21 clinicians with data). Median for this group: 452. Middle half: 163 to 921.
More Medicare Part B services than 90% of clinicians listed under Physician Assistant in Illinois (2024, 2,422 clinicians with data). Median for this group: 212. Middle half: 76 to 548.
Medicare-allowed amount
A higher Medicare-allowed amount than 85% of clinicians listed under Physician Assistant in Glenview, IL (2024, 21 clinicians with data). Median for this group: $30,091. Middle half: $9,989 to $69,924.
A higher Medicare-allowed amount than 95% of clinicians listed under Physician Assistant in Illinois (2024, 2,422 clinicians with data). Median for this group: $16,580. Middle half: $6,650 to $35,717.
Paid by Medicare
A higher Medicare payment amount than 85% of clinicians listed under Physician Assistant in Glenview, IL (2024, 21 clinicians with data). Median for this group: $21,604. Middle half: $7,492 to $54,089.
A higher Medicare payment amount than 95% of clinicians listed under Physician Assistant in Illinois (2024, 2,422 clinicians with data). Median for this group: $12,415. Middle half: $4,894 to $26,472.
Medicare Part D prescriptions
More Part D prescriptions than 90% of clinicians listed under Physician Assistant in Glenview, IL (2024, 20 clinicians with data). Median for this group: 161. Middle half: 87 to 238.
More Part D prescriptions than 75% of clinicians listed under Physician Assistant in Illinois (2024, 2,668 clinicians with data). Median for this group: 203. Middle half: 67 to 595.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in Glenview, IL (2024, 20 clinicians with data). Median for this group: $1,060. Middle half: $729 to $4,612.
A higher Part D drug cost than 90% of clinicians listed under Physician Assistant in Illinois (2024, 2,668 clinicians with data). Median for this group: $3,018. Middle half: $535 to $48,132.
47 active clinicians are listed under Physician Assistant with a practice address in Glenview, IL (4,929 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Glenview
12.8% of these 47 clinicians have the CMS telehealth indicator.
63.8% of these 47 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 27% from 4,116 in 2023 to 3,003 in 2024.
- 2023: 4,116
- 2024: 3,003
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Medicare-allowed amount
Medicare-allowed amount decreased 25% from $182,199 in 2023 to $136,868 in 2024.
- 2023: $182,199
- 2024: $136,868
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Paid by Medicare
Paid by Medicare decreased 31% from $129,908 in 2023 to $89,206 in 2024.
- 2023: $129,908
- 2024: $89,206
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Medicare Part D prescriptions
Medicare Part D prescriptions stayed about the same: 710 in 2023 and 716 in 2024.
- 2023: 710
- 2024: 716
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30-day fills
30-day fills stayed about the same: 820 in 2023 and 884 in 2024.
- 2023: 820
- 2024: 884
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Part D drug cost
Part D drug cost increased 105% from $128,480 in 2023 to $263,325 in 2024.
- 2023: $128,480
- 2024: $263,325
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $292.82 in 2022 to $223.20 in 2025.
- 2022: $292.82
- 2023: $2,238.95
- 2024: $1,297.60
- 2025: $223.20
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): fewer than 11 records totaling $223.20.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $33.90 |
| MAYNE PHARMA COMMERCIAL LLC |
Food and Beverage
In-kind items and services
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โ | General | $33.16 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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RINVOQ | General | $26.87 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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OTEZLA | General | $20.44 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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RINVOQ | General | $19.67 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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SKYRIZI | General | $19.30 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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SKYRIZI | General | $19.28 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
OTEZLA | General | $19.03 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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SKYRIZI | General | $17.86 |
| Galderma Laboratories, L.P. |
Food and Beverage
In-kind items and services
|
NEMLUVIO | General | $13.69 |
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 2022โ2023 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, 2023โ2024; 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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17003
Destruction of precancer skin growth, 2-14 growths
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1,172 | 216 | $19.40 | $5.22 |
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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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642 | 560 | $260.15 | $74.35 |
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17000
Destruction of precancer skin growth, 1 growth
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303 | 276 | $199.35 | $40.43 |
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17110
Destruction of skin growth, 1-14 growths
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229 | 218 | $316.77 | $90.53 |
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11102
Biopsy of related skin growth, first growth
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207 | 199 | $288.87 | $71.81 |
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11103
Biopsy of related skin growth, each additional growth
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114 | 79 | $151.83 | $39.96 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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102 | 102 | $337.40 | $91.48 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
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53 | 50 | $170.18 | $45.89 |
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17004
Destruction of precancer skin growth, 15 or more growths
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48 | 43 | $471.98 | $134.10 |
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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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42 | 35 | $332.62 | $110.22 |
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J3301
Injection, triamcinolone acetonide, not otherwise specified, 10 mg
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32 | 12 | $5.61 | $1.01 |
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69100
Biopsy of ear
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20 | 18 | $288.00 | $49.36 |
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13101
Complicated repair of wound of trunk, 2.6-7.5 cm
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15 | 14 | $1184.00 | $315.34 |
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11602
Removal of cancer skin growth of body, arms, or legs, 1.1-2.0 cm
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12 | 12 | $723.00 | $113.92 |
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99202
New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more
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12 | 12 | $214.00 | $55.83 |
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 |
|---|---|---|---|---|---|
| Ketoconazole | Ketoconazole | 141 | 4,375 | $2,585.29 | 85 |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 133 | 4,840 | $1,461.68 | 88 |
| Clobetasol Propionate | Clobetasol Propionate | 118 | 3,843 | $8,968.95 | 67 |
| Dupixent Pen | Dupilumab | 61 | 1,820 | $241,774.58 | โ |
| Fluorouracil | Fluorouracil | 41 | 1,282 | $2,213.46 | 35 |
| Mupirocin | Mupirocin | 37 | 797 | $193.75 | 31 |
| Metronidazole | Metronidazole | 34 | 1,065 | $1,333.38 | 19 |
| Minocycline Hcl | Minocycline Hcl | 31 | 1,300 | $393.50 | 19 |
| Betamethasone Dipropionate | Betamethasone Dipropionate | 26 | 980 | $2,084.58 | 17 |
| Clindamycin Phosphate | Clindamycin Phosphate | 26 | 735 | $1,023.72 | โ |
| Fluocinonide | Fluocinonide | 22 | 607 | $575.30 | 14 |
| Doxycycline Hyclate | Doxycycline Hyclate | 19 | 1,000 | $177.63 | โ |
| Ampicillin Trihydrate | Ampicillin Trihydrate | 14 | 660 | $458.22 | โ |
| Hydrocortisone | Hydrocortisone | 13 | 332 | $80.90 | 11 |
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: 2025-07-24NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20221128000121
IL
4183092059
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
On The Spot Dermatology Pllc
3633 W Lake Ave, Glenview, IL 600265804
Phone: 8478344361
Deerfield Dermatology Associates, Ltd.
707 Lake Cook Rd, Deerfield, IL 600155255
Phone: 8474800004
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner - Family
Master of Science, Family Nurse Practitioner (Board Certified), FPA
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 3633 W LAKE AVE STE 409, GLENVIEW, IL 600265804 (Tel: 8478344361)
Registered at 3633 W LAKE AVE STE 409, GLENVIEW, IL 600265804 (Tel: 8478344361)
NPI status registered as active in NPPES database
Registered at 3024 E EMPIRE ST STE E, BLOOMINGTON, IL 617045402 (Tel: 3094513376)
Registered at 302 INNOVATION DR STE 400, FRANKLIN, TN 370675997 (Tel: 2174332804)
Recorded as KAREN CHEN
Physician Assistant (license number reported to NPPES: IL 085009083)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Glenview
- Laura Jarosz, PA-C
- Kam Mueller, PA-C
- Angelica Marconi Zweig, PA-C
- Katie Reidy, PA-C
- Corey Merrill
- Rachael Lang, PA
Mailing Address
3633 W Lake Ave Ste 409
Glenview, IL 600265804
Phone: 8478344361