Katherine Trefzger Baker, FNP-C
- Medicare patients, 2024
- 79
- Part D claims, 2024
- 526
- Hospital affiliations
- 1
- Industry payments
- $197
- Medical group
- 1
- Practice address
- 15225 Healthcote Boulevard, Haymarket, VA 20169
- Practice phone
- Call (571) 284-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Katherine Baker's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Katherine Trefzger Baker is a family nurse practitioner in Haymarket, Virginia
Katherine Baker practices at UVA Health Haymarket Medical Center in Haymarket, Virginia, part of University of Virginia.
Katherine Baker's NPI, 1962520411, was assigned on March 26, 2007. Katherine Baker holds Virginia license 0001114394.
- NPI
- 1962520411NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5294891669
- NPI enumeration date
- March 26, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (571) 284-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Katherine Trefzger Baker practices at UVA Health Haymarket Medical Center in Haymarket, Virginia
Katherine Baker's primary practice is UVA Health Haymarket Medical Center, at 15225 Healthcote Boulevard, Haymarket, VA 20169 in Prince William County. The practice phone is (571) 284-1000.
- UVA Health Haymarket Medical Center15225 Healthcote Boulevard, Haymarket, VA 20169 · Prince William CountyPhone(571) 284-1000
Source: Dmand AI Affiliation Data
Katherine Trefzger Baker is affiliated with 2 sites of care and 1 medical group
Katherine Baker's primary practice is UVA Health Haymarket Medical Center in Haymarket, Virginia, part of University of Virginia. The medical group on file is Gainesville Family Practice. Dmand AI also links Katherine Baker to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Katherine Trefzger Baker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Katherine Baker practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UVA Health Haymarket Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Katherine Trefzger Baker is one of 4,876 family nurse practitioners in Virginia
Family is Katherine Baker's primary specialty in the NPI Registry, under taxonomy code 363LF0000X. Katherine Baker is licensed in Virginia.
Specialties and state licenses
- Family nurse practitioner, VirginiaPrimary
Family nurse practitioners near Katherine Baker
Counts of family nurse practitioners with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Katherine Trefzger Baker treated 79 Medicare patients in 2024, average age 74
CMS counts 79 Medicare patients who saw Katherine Baker in 2024. The largest group is 65 to 74, with 43 patients. 70% of them have high blood pressure, and 68% have high cholesterol. Their average risk score is 0.64, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Katherine Baker's median patient age at 51, with 78% women.
Katherine Baker's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Katherine Baker's Medicare patients by sex, 2024
- Women6481%
- Men1519%
Chronic conditions among Katherine Baker's Medicare patients, 2024
- High blood pressure70%
- High cholesterol68%
- Arthritis32%
- Anxiety23%
- Diabetes19%
- Mood disorders18%
- Depression16%
- Ischemic heart disease16%
Share of Medicare patients with each condition. A patient can have several.
Katherine Baker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women78%
- Men20%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Katherine Trefzger Baker wrote 526 Medicare Part D claims in 2024
In 2024, Katherine Baker wrote 526 Medicare Part D claims for 73 patients. 93% of them were for generic drugs.
Katherine Baker's Part D claims by kind of drug, 2024
- Generic487 claims93%
- Brand-name39 claims7%
Drug classes CMS tracks in Katherine Baker's Part D claims, 2024
- Antibiotics6%33 of 526 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Katherine Trefzger Baker takes part in Medicare
Katherine Baker accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Katherine Trefzger Baker received $197 in industry payments in 2025
CMS Open Payments shows 8 general payments to Katherine Baker from 3 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $153.
Companies that paid Katherine Baker the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Katherine Trefzger Baker's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Katherine Trefzger Baker
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Katherine Trefzger Baker's NPI number?
Katherine Trefzger Baker's NPI number is 1962520411. It was assigned on March 26, 2007, and it is active in the NPI Registry.
What does Katherine Trefzger Baker specialize in?
Katherine Trefzger Baker is a family nurse practitioner in Haymarket, Virginia. The primary specialty in the NPI Registry is Family Nurse Practitioner (taxonomy code 363LF0000X).
Where does Katherine Trefzger Baker practice?
Katherine Baker practices at 15225 Healthcote Boulevard, Haymarket, VA 20169. Katherine Baker's primary practice is UVA Health Haymarket Medical Center in Haymarket, Virginia, part of University of Virginia. Dmand AI also links Katherine Baker to 1 group practice or clinic.
What is Katherine Trefzger Baker's office phone number?
The practice phone on file for Katherine Baker is (571) 284-1000.
What is Katherine Trefzger Baker's medical license number?
Katherine Baker holds Virginia license 0001114394.
Which hospitals is Katherine Trefzger Baker affiliated with?
Katherine Baker practices at UVA Health Haymarket Medical Center in Haymarket, Virginia.
What medical group is Katherine Trefzger Baker part of?
Katherine Baker is linked to Gainesville Family Practice.
Does Katherine Trefzger Baker accept Medicare?
Yes. CMS lists Katherine Baker as accepting Medicare assignment.
How many Medicare patients does Katherine Trefzger Baker see?
CMS counts 79 Medicare patients who saw Katherine Baker in 2024, with an average age of 74.
Has Katherine Trefzger Baker received payments from drug or device companies?
CMS Open Payments shows $197 in general payments to Katherine Baker from 3 companies from 2025 to 2025. The largest total came from Novo Nordisk Inc.
How long has Katherine Trefzger Baker been practicing?
Katherine Baker graduated from medical school in 1998, 28 years ago.
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