Katherine Welles Robert , PA-C
Physician Assistant 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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Katherine Robert is listed in NPPES under Physician Assistant.
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NPI assigned on June 5, 2006; this date does not establish years in practice.
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Published CMS data list 3,905 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:
- Atorvastatin Calcium β 297 prescription fills, including refills.
- Levothyroxine Sodium β 277 prescription fills, including refills.
- Lisinopril β 183 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 all 93 records in the table Β· Guide: How to read Medicare Part D prescriber data
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More Part D prescriptions than 95% of clinicians listed under Physician Assistant in Ann Arbor, MI (2024, 259 clinicians with data). Median for this group: 136. Middle half: 34 to 379.
More Part D prescriptions than 90% of clinicians listed under Physician Assistant in Michigan (2024, 3,741 clinicians with data). Median for this group: 302. Middle half: 82 to 1,061.
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 3,498 in 2020 to 3,905 in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2020β2024.
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 Brighton, MI. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 2 distinct group names: Medical Office Of John Vassallo Md Pllc; Regents Of The University Of Michigan. 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
2004
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
8,512 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
$266,780 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: $273.52 across 15 records.
By nature of payment
- Food and Beverage: $273.52 across 15 records.
Reporting-company totals (3 largest of 6)
- AstraZeneca Pharmaceuticals LP: $122.63 across 7 records.
- Eli Lilly and Company: $57.72 across 3 records.
- Novo Nordisk Inc: $34.60 across 2 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
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.
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, βDoes your provider accept Medicare as full payment?β
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)
Katherine Robert 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 Katherine Robert 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
More Part D prescriptions than 95% of clinicians listed under Physician Assistant in Ann Arbor, MI (2024, 259 clinicians with data). Median for this group: 136. Middle half: 34 to 379.
More Part D prescriptions than 90% of clinicians listed under Physician Assistant in Michigan (2024, 3,741 clinicians with data). Median for this group: 302. Middle half: 82 to 1,061.
Part D drug cost
A higher Part D drug cost than 85% of clinicians listed under Physician Assistant in Ann Arbor, MI (2024, 259 clinicians with data). Median for this group: $1,676. Middle half: $257 to $25,084.
A higher Part D drug cost than 80% of clinicians listed under Physician Assistant in Michigan (2024, 3,741 clinicians with data). Median for this group: $6,107. Middle half: $669 to $117,415.
610 active clinicians are listed under Physician Assistant with a practice address in Ann Arbor, MI (6,989 in Michigan).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Ann Arbor
20.7% of these 610 clinicians have the CMS telehealth indicator.
68.2% of these 610 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 increased 12% from 3,498 in 2020 to 3,905 in 2024.
- 2020: 3,498
- 2021: 3,800
- 2022: 3,492
- 2023: 4,237
- 2024: 3,905
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30-day fills
30-day fills increased 11% from 7,663 in 2020 to 8,512 in 2024.
- 2020: 7,663
- 2021: 8,515
- 2022: 7,889
- 2023: 9,224
- 2024: 8,512
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Part D drug cost
Part D drug cost increased 154% from $105,071 in 2020 to $266,780 in 2024.
- 2020: $105,071
- 2021: $162,758
- 2022: $139,994
- 2023: $202,969
- 2024: $266,780
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2025 only.
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): 15 records totaling $273.52.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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KISUNLA | General | $23.07 |
| Exact Sciences Corporation |
Food and Beverage
In-kind items and services
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Cologuard Collection Kit | General | $22.00 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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BREZTRI | General | $20.84 |
| Bayer Healthcare Pharmaceuticals Inc. |
Food and Beverage
In-kind items and services
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Kerendia | General | $19.50 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Wegovy | General | $18.44 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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AIRSUPRA | General | $18.14 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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BREZTRI | General | $17.98 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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BREZTRI | General | $17.80 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $17.59 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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AIRSUPRA | General | $17.35 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
OTEZLA | General | $17.07 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $17.06 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Rybelsus | General | $16.16 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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BREZTRI | General | $15.37 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
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FARXIGA | General | $15.15 |
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 |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 297 | 21,459 | $3,408.20 | 70 |
| Levothyroxine Sodium | Levothyroxine Sodium | 277 | 20,920 | $3,208.66 | 69 |
| Lisinopril | Lisinopril | 183 | 14,456 | $1,599.48 | 48 |
| Losartan Potassium | Losartan Potassium | 160 | 12,853 | $2,400.14 | 52 |
| Amlodipine Besylate | Amlodipine Besylate | 154 | 11,162 | $1,200.12 | 37 |
| Omeprazole | Omeprazole | 149 | 10,948 | $1,926.38 | 41 |
| Metoprolol Succinate | Metoprolol Succinate | 127 | 9,846 | $2,139.61 | 35 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 99 | 8,751 | $1,549.77 | 35 |
| Metformin Hcl | Metformin Hcl | 91 | 7,222 | $1,101.00 | 31 |
| Sertraline Hcl | Sertraline Hcl | 88 | 6,608 | $596.16 | 23 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 85 | 2,394 | $1,903.05 | 17 |
| Fluticasone Propionate | Fluticasone Propionate | 77 | 3,960 | $1,552.13 | 28 |
| Gabapentin | Gabapentin | 67 | 4,429 | $1,329.30 | 26 |
| Prednisone | Prednisone | 66 | 1,262 | $307.36 | 35 |
| Metformin Hcl Er | Metformin Hcl | 65 | 4,472 | $1,112.70 | 16 |
| Hydrochlorothiazide | Hydrochlorothiazide | 63 | 5,180 | $367.90 | 19 |
| Jardiance | Empagliflozin | 59 | 3,159 | $60,044.48 | 15 |
| Montelukast Sodium | Montelukast Sodium | 56 | 3,652 | $1,021.70 | 14 |
| Triamterene-Hydrochlorothiazid | Triamterene/Hydrochlorothiazid | 54 | 3,420 | $534.19 | 11 |
| Simvastatin | Simvastatin | 53 | 4,349 | $551.46 | 15 |
| Potassium Chloride | Potassium Chloride | 50 | 2,545 | $1,300.75 | 11 |
| Trazodone Hcl | Trazodone Hcl | 49 | 2,730 | $569.36 | 11 |
| Tramadol Hcl | Tramadol Hcl | 47 | 1,387 | $265.63 | 15 |
| Escitalopram Oxalate | Escitalopram Oxalate | 47 | 3,917 | $712.23 | 16 |
| Bupropion Xl | Bupropion Hcl | 47 | 3,210 | $1,154.74 | β |
(top 25 shown)
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: 2026-03-18NUCC 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.
NUCC Taxonomy Code: 363AM0700X
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20060620000106
MI
0547272296
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
Regents Of The University Of Michigan
1500 E Medical Ctr Dr, Ann Arbor, MI 481095000
Phone: 7349364000
Medical Office Of John Vassallo Md Pllc
4354 E Grand River Ave, Howell, MI 488438554
Phone: 5175400709
Secondary Practice Locations
2209 Euler Rd
Brighton, MI 481146815
Phone: 5175400709
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Obstetrics & Gynecology
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant (Certified)
Anesthesiology
Doctor of Medicine (M.D.)
Radiology - Radiation Oncology
Doctor of Medicine (M.D.)
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)
Physician Assistant
Physician Assistant (Certified)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 1500 E MEDICAL CENTER DR, ANN ARBOR, MI 481095000 (Tel: 7349365000)
Registered at 3621 S STATE ST, ANN ARBOR, MI 481081633 (Tel: 7346475299)
Recorded as KATHERINE ROBERT, PA-C
NPI status registered as active in NPPES database
Registered at 2209 EULER RD, BRIGHTON, MI 481146815 (Tel: 8102257960)
Registered at 3837 SILVER CHARM LN, HOWELL, MI 488439215 (Tel: 8102257960)
Recorded as KATHARINE ROBERT, P.A.
Physician Assistant (license number reported to NPPES: MI 5601004290)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Ann Arbor
- Teresa Lamoureaux, PA
- Deborah Rutherford, PA
- Chantal Lindsay, PA-C
- Lauren Northway, PA
- Daniel Sutherland, PA-C
- Chelsey Quinlan, PA-C
Mailing Address
3621 S State St
Ann Arbor, MI 481081633
Phone: 7346475299