Dr. Colleen Ann Keegan , DO
Dermatology • Naperville, IL
636 Raymond Dr Ste 200
Naperville, IL 605639791
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 December 4, 2007; this date does not establish years in practice.
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Published CMS data list 1,102 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:
- 17003 — Destruction of precancer skin growth, 2-14 growths: 291 service units.
- 99214 — Established patient outpatient office visit: 280 service units.
- 17000 — Destruction of precancer skin growth, 1 growth: 155 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 10 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 807 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:
- Ketoconazole — 149 prescription fills, including refills.
- Triamcinolone Acetonide — 98 prescription fills, including refills.
- Clobetasol Propionate — 56 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 20 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 Dermatology in Naperville, IL (2024, 15 clinicians with data). Median for this group: 2,025. Middle half: 1,099 to 2,738.
Fewer Medicare Part B services than 70% of clinicians listed under Dermatology in Illinois (2024, 405 clinicians with data). Median for this group: 2,033. Middle half: 899 to 4,119.
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 487 in 2020 to 1,102 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
636 Raymond Dr Ste 200
Naperville, IL 605639791
CMS Doctors and Clinicians lists 1 group name: Central Dupage Physician Group. 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
Chicago College Of Osteopathy
1986
What Public CMS Data Show
Dermatology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
310 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 $91,312 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 $66,005 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
931 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
$493,733 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)
Fewer than 11 payment records totaling $15.27 in 2023
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2023.
Years since graduation
40 years (graduated 1986)
CMS Doctors and Clinicians data list 1986 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, “Does your provider accept Medicare as full payment?”
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Keegan 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. Keegan 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 Naperville 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 Dermatology in Naperville, IL (2024, 15 clinicians with data). Median for this group: 2,025. Middle half: 1,099 to 2,738.
Fewer Medicare Part B services than 70% of clinicians listed under Dermatology in Illinois (2024, 405 clinicians with data). Median for this group: 2,033. Middle half: 899 to 4,119.
Medicare-allowed amount
A lower Medicare-allowed amount than 60% of clinicians listed under Dermatology in Naperville, IL (2024, 15 clinicians with data). Median for this group: $169,085. Middle half: $65,215 to $221,689.
A lower Medicare-allowed amount than 65% of clinicians listed under Dermatology in Illinois (2024, 405 clinicians with data). Median for this group: $141,868. Middle half: $64,155 to $281,967.
Paid by Medicare
A lower Medicare payment amount than 60% of clinicians listed under Dermatology in Naperville, IL (2024, 15 clinicians with data). Median for this group: $115,994. Middle half: $45,455 to $155,168.
A lower Medicare payment amount than 65% of clinicians listed under Dermatology in Illinois (2024, 405 clinicians with data). Median for this group: $99,602. Middle half: $44,437 to $204,261.
Medicare Part D prescriptions
More Part D prescriptions than 70% of clinicians listed under Dermatology in Naperville, IL (2024, 16 clinicians with data). Median for this group: 586. Middle half: 330 to 867.
More Part D prescriptions than 70% of clinicians listed under Dermatology in Illinois (2024, 468 clinicians with data). Median for this group: 471. Middle half: 165 to 904.
Part D drug cost
A higher Part D drug cost than 85% of clinicians listed under Dermatology in Naperville, IL (2024, 16 clinicians with data). Median for this group: $88,514. Middle half: $10,268 to $227,377.
A higher Part D drug cost than 80% of clinicians listed under Dermatology in Illinois (2024, 468 clinicians with data). Median for this group: $69,576. Middle half: $5,709 to $275,598.
18 active clinicians are listed under Dermatology with a practice address in Naperville, IL (647 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Naperville
16.7% of these 18 clinicians have the CMS telehealth indicator.
88.9% of these 18 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 increased 126% from 487 in 2020 to 1,102 in 2024.
- 2020: 487
- 2021: 710
- 2022: 894
- 2023: 1,178
- 2024: 1,102
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Medicare-allowed amount
Medicare-allowed amount increased 150% from $36,553 in 2020 to $91,312 in 2024.
- 2020: $36,553
- 2021: $70,680
- 2022: $80,098
- 2023: $93,083
- 2024: $91,312
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Paid by Medicare
Paid by Medicare increased 134% from $28,249 in 2020 to $66,005 in 2024.
- 2020: $28,249
- 2021: $52,885
- 2022: $56,505
- 2023: $66,405
- 2024: $66,005
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 216% from 255 in 2020 to 807 in 2024.
- 2020: 255
- 2021: 492
- 2022: 653
- 2023: 778
- 2024: 807
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30-day fills
30-day fills increased 229% from 283 in 2020 to 931 in 2024.
- 2020: 283
- 2021: 520
- 2022: 727
- 2023: 895
- 2024: 931
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Part D drug cost
Part D drug cost increased 4603% from $10,498 in 2020 to $493,733 in 2024.
- 2020: $10,498
- 2021: $17,714
- 2022: $205,445
- 2023: $175,361
- 2024: $493,733
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Industry payments (Open Payments)
Industry payments (Open Payments) decreased 99% from $1,202.52 in 2019 to $15.27 in 2023.
- 2019: $1,202.52
- 2020: $146.02
- 2022: $124.28
- 2023: $15.27
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2023), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 2023 (payments made January 1 – December 31, 2023): fewer than 11 records totaling $15.27.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Pfizer Inc. |
Education
In-kind items and services
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CIBINQO | General | $15.27 |
Source: CMS Open Payments, program year 2023, released June 30, 2026.
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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17003
Destruction of precancer skin growth, 2-14 growths
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291 | 87 | $36.00 | $7.00 |
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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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280 | 211 | $194.00 | $135.25 |
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17000
Destruction of precancer skin growth, 1 growth
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155 | 120 | $161.00 | $56.13 |
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17110
Destruction of skin growth, 1-14 growths
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142 | 119 | $328.00 | $114.90 |
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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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133 | 110 | $123.00 | $96.39 |
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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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35 | 35 | $311.00 | $173.42 |
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11102
Biopsy of related skin growth, first growth
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22 | 20 | $293.00 | $90.22 |
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11104
Punch biopsy, first skin growth
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19 | 18 | $368.00 | $133.56 |
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11301
Shaving of skin growth of body, arms, or legs, 0.6-1.0 cm
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14 | 13 | $234.00 | $119.57 |
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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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11 | 11 | $205.00 | $118.46 |
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 | 149 | 4,213 | $2,191.57 | 65 |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 98 | 3,270 | $996.06 | 80 |
| Clobetasol Propionate | Clobetasol Propionate | 56 | 1,562 | $2,611.66 | 43 |
| Metronidazole | Metronidazole | 53 | 1,662 | $4,192.64 | 30 |
| Doxycycline Hyclate | Doxycycline Hyclate | 43 | 1,250 | $1,007.03 | 12 |
| Spironolactone | Spironolactone | 43 | 2,740 | $560.54 | — |
| Hydrocortisone | Hydrocortisone | 39 | 1,026 | $644.72 | 22 |
| Humira(Cf) Pen | Adalimumab | 34 | 952 | $354,052.57 | — |
| Fluocinonide | Fluocinonide | 33 | 1,037 | $1,540.86 | 23 |
| Dupixent Pen | Dupilumab | 31 | 910 | $117,698.69 | — |
| Alclometasone Dipropionate | Alclometasone Dipropionate | 30 | 635 | $783.02 | 28 |
| Econazole Nitrate | Econazole Nitrate | 28 | 853 | $1,076.94 | 18 |
| Ammonium Lactate | Ammonium Lactate | 27 | 861 | $576.94 | 20 |
| Clindamycin Phosphate | Clindamycin Phosphate | 27 | 745 | $861.68 | 17 |
| Calcipotriene | Calcipotriene | 21 | 595 | $2,178.52 | — |
| Valacyclovir | Valacyclovir Hcl | 21 | 193 | $233.02 | — |
| Mupirocin | Mupirocin | 20 | 346 | $126.43 | 19 |
| Clotrimazole-Betamethasone | Clotrimazole/Betamethasone Dip | 19 | 469 | $539.16 | 11 |
| Hydroxyzine Hcl | Hydroxyzine Hcl | 19 | 570 | $175.67 | — |
| Azelaic Acid | Azelaic Acid | 16 | 674 | $1,685.06 | — |
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
Self-certified to NPPES: 2025-06-25NUCC Taxonomy Code: 207N00000X
A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - DERMATOLOGY
I20041213000783
IL
6002897436
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
Central Dupage Physician Group
636 Raymond Dr, Naperville, IL 605639789
Phone: 6303156500
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Dermatology
Doctor of Medicine (M.D.)
Dermatology
Doctor of Medicine (M.D.)
Dermatology
Doctor of Osteopathic Medicine (D.O.)
Dermatology
Doctor of Medicine (M.D.)
Dermatology - MOHS-Micrographic Surgery
Doctor of Medicine (M.D.)
Dermatology
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 636 RAYMOND DR STE 200, NAPERVILLE, IL 605639791 (Tel: 6303156500)
Registered at 636 RAYMOND DR STE 200, NAPERVILLE, IL 605639791 (Tel: 6303156500)
NPI status registered as active in NPPES database
Registered at 636 NAPERVILLE RD, NAPERVILLE, IL 60563 (Tel: 6303156500)
Registered at 636 NAPERVILLE RD, NAPERVILLE, IL 60563 (Tel: 6303156500)
Recorded as COLLEEN KEEGAN, D.O.
Dermatology (license number reported to NPPES: IL 036-076923)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Dermatology Specialists in Naperville
- Dr. Lauren Taglia, MD PHD
- Dr. Shruthi Reddy, MD
- Dr. Andrew Johnson, MD
- Dr. Andia Renz, MD
- Dr. Anthony Peterson, MD
- Dr. Anthony Janiga, MD
Mailing Address
636 Raymond Dr Ste 200
Naperville, IL 605639791
Phone: 6303156500