Dr. Ruby Kwak , MD
Dermatology β’ Ann Arbor, MI
1500 E Medical Center Dr
Ann Arbor, MI 481095000
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 March 29, 2021; this date does not establish years in practice.
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Published CMS data list 16 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Ketoconazole β 16 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table Β· Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 85% of clinicians listed under Dermatology in Ann Arbor, MI (2024, 38 clinicians with data). Median for this group: 252. Middle half: 110 to 529.
Fewer Part D prescriptions than 95% of clinicians listed under Dermatology in Michigan (2024, 335 clinicians with data). Median for this group: 655. Middle half: 288 to 1,177.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 44 in 2023 to 16 in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2023β2024.
Practice Location & Contact Primary Location
1500 E Medical Center Dr
Ann Arbor, MI 481095000
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 Boston, MA. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
What Public CMS Data Show
Dermatology: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
20 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
$366 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 β by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $516.33 across 11 records.
By nature of payment
- Food and Beverage: $516.33 across 11 records.
Reporting-company totals (3 largest of 6)
- Janssen Pharmaceuticals, Inc: $184.23 across 2 records.
- Sanofi and Genzyme US Companies: $179.33 across 2 records.
- Janssen Pharmaceuticals, Inc: $65.77 across 3 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).
NPI first issued
2021
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, βDoes your provider accept Medicare as full payment?β
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.
Can order Medicare-covered services
CMS lists Dr. Kwak 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 Ann Arbor and Michigan
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 85% of clinicians listed under Dermatology in Ann Arbor, MI (2024, 38 clinicians with data). Median for this group: 252. Middle half: 110 to 529.
Fewer Part D prescriptions than 95% of clinicians listed under Dermatology in Michigan (2024, 335 clinicians with data). Median for this group: 655. Middle half: 288 to 1,177.
Part D drug cost
A lower Part D drug cost than 85% of clinicians listed under Dermatology in Ann Arbor, MI (2024, 38 clinicians with data). Median for this group: $57,620. Middle half: $3,637 to $149,523.
A lower Part D drug cost than 95% of clinicians listed under Dermatology in Michigan (2024, 335 clinicians with data). Median for this group: $90,021. Middle half: $10,648 to $315,967.
56 active clinicians are listed under Dermatology with a practice address in Ann Arbor, MI (471 in Michigan).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Ann Arbor
14.3% of these 56 clinicians have the CMS telehealth indicator.
66.1% of these 56 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 64% from 44 in 2023 to 16 in 2024.
- 2023: 44
- 2024: 16
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30-day fills
30-day fills decreased 59% from 48 in 2023 to 20 in 2024.
- 2023: 48
- 2024: 20
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Part D drug cost
Part D drug cost decreased 92% from $4,493 in 2023 to $366 in 2024.
- 2023: $4,493
- 2024: $366
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $630.64 in 2022 to $516.33 in 2025.
- 2022: $630.64
- 2023: $763.60
- 2024: $536.78
- 2025: $516.33
Sources: 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 Β· 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 β December 31, 2025): 11 records totaling $516.33.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
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DUPIXENT | General | $150.00 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $138.58 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $45.65 |
| Arcutis Biotherapeutics, Inc. |
Food and Beverage
In-kind items and services
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Zoryve | General | $31.52 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
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DUPIXENT | General | $29.33 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $28.69 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $19.61 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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RINVOQ | General | $19.14 |
| Chiesi USA, Inc. |
Food and Beverage
Cash or cash equivalent
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FILSUVEZ | General | $18.69 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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RINVOQ | General | $17.65 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $17.47 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
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 | 16 | 585 | $365.98 | β |
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: 2026-06-23NUCC 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.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSSources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Secondary Practice Locations
55 Fruit St
Boston, MA 021142696
Phone: 6177262000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Radiology - Diagnostic Radiology
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine - Rheumatology
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 3621 S STATE ST, ANN ARBOR, MI 481081633 (Tel: 7346475299)
Dermatology (license number reported to NPPES: MI 4301517523)
Registered at 1500 E MEDICAL CENTER DR, ANN ARBOR, MI 481095000 (Tel: 7349364068)
Registered at 1500 E MEDICAL CENTER DR, ANN ARBOR, MI 481095000 (Tel: 7349364068)
NPI status registered as active in NPPES database
Registered at 55 FRUIT ST, BOSTON, MA 021142696 (Tel: 6177262000)
Registered at 170 BROOKLINE AVE UNIT 510, BOSTON, MA 022153922 (Tel: 8577638375)
Recorded as RUBY KWAK, MD
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Dermatology Specialists in Ann Arbor
- Dr. Albert Cattell, MD
- Dr. Jeffrey Orringer, MD
- Dr. Thomas Hester, MD
- Dr. Sakeena Fatima, MD
- Dr. Rachel Fayne, MD
- Dr. Frank Wang, MD
Mailing Address
3621 S State St
Ann Arbor, MI 481081633
Phone: 7346475299