Dr. Troy W Baker , DO
Allergy & Immunology • Mc Lean, VA
8008 Westpark Dr
Mc Lean, VA 221023109
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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Dr. Troy Baker is listed in NPPES under Allergy & Immunology.
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NPI assigned on January 25, 2007; this date does not establish years in practice.
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Published CMS data list 136 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:
- Azelastine Hcl — 54 prescription fills, including refills.
- Ipratropium Bromide — 52 prescription fills, including refills.
- Epinephrine — 18 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 4 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 65% of clinicians listed under Allergy & Immunology in Virginia (2024, 90 clinicians with data). Median for this group: 221. Middle half: 61 to 654.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 42 in 2020 to 136 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
8008 Westpark Dr
Mc Lean, VA 221023109
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 1 group name: Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc. 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
2005
What Public CMS Data Show
Allergy & Immunology: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
184 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
$4,497 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 $24.05 in 2022
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 2022.
Years since graduation
21 years (graduated 2005)
CMS Doctors and Clinicians data list 2005 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?”
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)
Dr. Baker 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. Baker 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 Mc Lean and Virginia
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 65% of clinicians listed under Allergy & Immunology in Virginia (2024, 90 clinicians with data). Median for this group: 221. Middle half: 61 to 654.
Too few clinicians listed under Allergy & Immunology in Mc Lean have Medicare Part D data for 2024 to compare.
Part D drug cost
A lower Part D drug cost than 80% of clinicians listed under Allergy & Immunology in Virginia (2024, 90 clinicians with data). Median for this group: $90,759. Middle half: $11,674 to $201,390.
Too few clinicians listed under Allergy & Immunology in Mc Lean have Medicare Part D data for 2024 to compare.
5 active clinicians are listed under Allergy & Immunology with a practice address in Mc Lean, VA (136 in Virginia).
Addresses are self-reported to NPPES and may be out of date.
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 224% from 42 in 2020 to 136 in 2024.
- 2020: 42
- 2021: 80
- 2022: 89
- 2023: 162
- 2024: 136
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30-day fills
30-day fills increased 203% from 61 in 2020 to 184 in 2024.
- 2020: 61
- 2021: 87
- 2022: 103
- 2023: 202
- 2024: 184
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Part D drug cost
Part D drug cost increased 91% from $2,353 in 2020 to $4,497 in 2024.
- 2020: $2,353
- 2021: $3,938
- 2022: $7,513
- 2023: $16,708
- 2024: $4,497
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2022 only.
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2022), 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 2022 (payments made January 1 – December 31, 2022): fewer than 11 records totaling $24.05.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
VRAYLAR | General | $24.05 |
Source: CMS Open Payments, program year 2022, 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 |
|---|---|---|---|---|---|
| Azelastine Hcl | Azelastine Hcl | 54 | 2,425 | $912.27 | 26 |
| Ipratropium Bromide | Ipratropium Bromide | 52 | 1,794 | $1,296.16 | 23 |
| Epinephrine | Epinephrine | 18 | 525 | $2,188.44 | 11 |
| Famotidine | Famotidine | 12 | 660 | $100.01 | — |
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: 2021-06-08NUCC Taxonomy Code: 207K00000X
An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.
NUCC Taxonomy Code: 208000000X
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
NUCC Taxonomy Code: 207KA0200X
A physician who specializes in the diagnosis, treatment, and management of allergies.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - ALLERGY/IMMUNOLOGY
I20150722005430
VA
2860637840
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
Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc
13285 Minnieville Rd, Woodbridge, VA 221924018
Phone: 7039862400
Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc
8008 Westpark Dr, Mc Lean, VA 221023109
Phone: 7032876400
Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc
1221 Mercantile Ln, Largo, MD 207745374
Phone: 3016185700
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Pediatrics - Pediatric Allergy/Immunology
Doctor of Medicine (M.D.)
Allergy & Immunology
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 8008 WESTPARK DR, MC LEAN, VA 221023109 (Tel: 7032876559)
Registered at 10105 NADINE DR, VIENNA, VA 221814049
Pediatrics (license number reported to NPPES: OH 58.001854)
NPI status registered as active in NPPES database
Registered at 1505 FRANKLIN RD SW, ROANOKE, VA 240165206 (Tel: 5403437331)
Registered at 1620 ETON WAY, CROFTON, MD 211141527
Recorded as TROY BAKER, D.O.
Allergy & Immunology (license number reported to NPPES: VA 0102204034)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
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Mailing Address
10105 Nadine Dr
Vienna, VA 221814049