Diana Lynn Losak , PA-C
Physician Assistant • Plano, TX
4716 Alliance Boulevard, Ste 700
Plano, TX 750935389
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 27, 2013; this date does not establish years in practice.
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Published CMS data list 3,055 Original Medicare Part B services in 2022.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022. Published rows only; this is not a quality measure.
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Published Part B service records, 2022:
- 17003 — Destruction of precancer skin growth, 2-14 growths: 1,363 service units.
- 99213 — Established patient outpatient office visit: 576 service units.
- 17000 — Destruction of precancer skin growth, 1 growth: 338 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2021 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2022). CPT notice
See all 14 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 156 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:
- Triamcinolone Acetonide — 22 prescription fills, including refills.
- Mupirocin — 21 prescription fills, including refills.
- Doxycycline Hyclate — 20 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 10 records in the table · Guide: How to read Medicare Part D prescriber data
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Close to the middle for Part D prescriptions among clinicians listed under Physician Assistant in Plano, TX (2024, 82 clinicians with data). Median for this group: 222. Middle half: 49 to 493.
Fewer Part D prescriptions than 60% of clinicians listed under Physician Assistant in Texas (2024, 4,882 clinicians with data). Median for this group: 261. Middle half: 73 to 938.
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 B services went from 2,708 in 2018 to 3,055 in 2022.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2018–2022.
Practice Location & Contact Primary Location
4716 Alliance Boulevard
Ste 700
Plano, TX 750935389
CMS Doctors and Clinicians lists 1 group name: James H Herndon Jr Md Pa. 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
2012
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $121,271 in 2022
The total amount Medicare approved for these services in 2022. 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, 2022.
Paid by Medicare
About $83,227 in 2022
The part of the Medicare-allowed amount that Medicare itself paid in 2022, 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, 2022.
30-day fills
179 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
$63,605 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.
Open Payments general payments, program year 2025
All general payments: $2,885.35 across 131 records.
By nature of payment
- Food and Beverage: $2,885.35 across 131 records.
Reporting-company totals (3 largest of 20)
- LEO Pharma Inc.: $417.17 across 12 records.
- Sanofi and Genzyme US Companies: $331.06 across 10 records.
- SUN PHARMACEUTICAL INDUSTRIES INC.: $304.26 across 14 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
14 years (graduated 2012)
CMS Doctors and Clinicians data list 2012 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
2013
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)
Diana Losak 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 Diana Losak 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 Plano and Texas
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Close to the middle for clinicians listed under Physician Assistant in Plano, TX (2024, 82 clinicians with data). Median for this group: 222. Middle half: 49 to 493.
Fewer Part D prescriptions than 60% of clinicians listed under Physician Assistant in Texas (2024, 4,882 clinicians with data). Median for this group: 261. Middle half: 73 to 938.
Part D drug cost
A higher Part D drug cost than 80% of clinicians listed under Physician Assistant in Plano, TX (2024, 82 clinicians with data). Median for this group: $6,381. Middle half: $493 to $33,995.
A higher Part D drug cost than 65% of clinicians listed under Physician Assistant in Texas (2024, 4,882 clinicians with data). Median for this group: $7,999. Middle half: $749 to $103,240.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Diana Losak are from 2022.
227 active clinicians are listed under Physician Assistant with a practice address in Plano, TX (11,008 in Texas).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Plano
15.4% of these 227 clinicians have the CMS telehealth indicator.
46.7% of these 227 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 13% from 2,708 in 2018 to 3,055 in 2022.
- 2018: 2,708
- 2019: 2,918
- 2020: 2,390
- 2021: 3,129
- 2022: 3,055
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Medicare-allowed amount
Medicare-allowed amount increased 35% from $89,865 in 2018 to $121,271 in 2022.
- 2018: $89,865
- 2019: $101,699
- 2020: $83,123
- 2021: $126,065
- 2022: $121,271
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Paid by Medicare
Paid by Medicare increased 32% from $62,865 in 2018 to $83,227 in 2022.
- 2018: $62,865
- 2019: $71,059
- 2020: $56,787
- 2021: $87,066
- 2022: $83,227
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 64% from 436 in 2020 to 156 in 2024.
- 2020: 436
- 2021: 478
- 2022: 497
- 2023: 155
- 2024: 156
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30-day fills
30-day fills decreased 62% from 465 in 2020 to 179 in 2024.
- 2020: 465
- 2021: 532
- 2022: 525
- 2023: 182
- 2024: 179
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Part D drug cost
Part D drug cost increased 362% from $13,766 in 2020 to $63,605 in 2024.
- 2020: $13,766
- 2021: $120,348
- 2022: $100,760
- 2023: $6,408
- 2024: $63,605
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $107.30 in 2022 to $2,885.35 in 2025.
- 2022: $107.30
- 2023: $2,771.28
- 2024: $2,479.70
- 2025: $2,885.35
Sources: CMS Medicare Physician & Other Practitioners (2022), 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 · 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 – December 31, 2025): 131 records totaling $2,885.35.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| LEO Pharma Inc. |
Food and Beverage
In-kind items and services
|
ANZUPGO | General | $109.01 |
| Galderma Laboratories, L.P. |
Food and Beverage
In-kind items and services
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NEMLUVIO | General | $81.67 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
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DUPIXENT | General | $47.03 |
| LEO Pharma Inc. |
Food and Beverage
In-kind items and services
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ADBRY | General | $45.22 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $44.49 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
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DUPIXENT | General | $44.18 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $40.76 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $39.37 |
| SUN PHARMACEUTICAL INDUSTRIES INC. |
Food and Beverage
In-kind items and services
|
ILUMYA | General | $36.71 |
| SUN PHARMACEUTICAL INDUSTRIES INC. |
Food and Beverage
In-kind items and services
|
ILUMYA | General | $34.60 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $32.65 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
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Rhapsido | General | $32.47 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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TALTZ | General | $32.46 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
|
— | General | $30.91 |
| SUN PHARMACEUTICAL INDUSTRIES INC. |
Food and Beverage
In-kind items and services
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ILUMYA | General | $30.68 |
| LEO Pharma Inc. |
Food and Beverage
In-kind items and services
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ADBRY | General | $30.44 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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DUPIXENT | General | $30.05 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
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DUPIXENT | General | $29.93 |
| UCB, Inc. |
Food and Beverage
In-kind items and services
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Bimzelx | General | $29.76 |
| LEO Pharma Inc. |
Food and Beverage
In-kind items and services
|
ADBRY | General | $29.44 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
|
TREMFYA | General | $29.27 |
| LEO Pharma Inc. |
Food and Beverage
In-kind items and services
|
ADBRY | General | $29.04 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $28.86 |
| LEO Pharma Inc. |
Food and Beverage
In-kind items and services
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ADBRY | General | $28.64 |
| SUN PHARMACEUTICAL INDUSTRIES INC. |
Food and Beverage
In-kind items and services
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ILUMYA | General | $28.53 |
(top 25 shown)
Source: CMS Open Payments, program year 2025, 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 2016–2021 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, 2017–2022; 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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1,363 | 209 | $23.71 | $5.61 |
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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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576 | 416 | $121.30 | $74.38 |
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17000
Destruction of precancer skin growth, 1 growth
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338 | 246 | $174.96 | $49.18 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
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227 | 196 | $88.78 | $45.97 |
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17110
Destruction of skin growth, 1-14 growths
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188 | 155 | $229.03 | $92.22 |
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11102
Biopsy of related skin growth, first growth
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168 | 147 | $297.49 | $80.52 |
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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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44 | 44 | $197.21 | $91.93 |
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11900
Injection into skin growth, 1-7 growths
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31 | 24 | $131.56 | $43.83 |
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17004
Destruction of precancer skin growth, 15 or more growths
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29 | 20 | $449.58 | $139.64 |
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11103
Biopsy of related skin growth, each additional growth
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27 | 23 | $148.01 | $42.45 |
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J3301
Injection, triamcinolone acetonide, not otherwise specified, 10 mg
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21 | 14 | $10.00 | $1.12 |
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99202
New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more
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18 | 18 | $132.47 | $59.62 |
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J9260
Injection, methotrexate sodium, 50 mg
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14 | 11 | $12.00 | $2.24 |
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10060
Simple or single drainage of skin abscess
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11 | 11 | $236.70 | $102.90 |
Source: CMS Part B by Provider and Service, 2022; 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 |
|---|---|---|---|---|---|
| Triamcinolone Acetonide | Triamcinolone Acetonide | 22 | 648 | $229.50 | 22 |
| Mupirocin | Mupirocin | 21 | 544 | $155.88 | 17 |
| Doxycycline Hyclate | Doxycycline Hyclate | 20 | 717 | $376.53 | 12 |
| Desonide | Desonide | 17 | 457 | $511.83 | 13 |
| Dupixent Pen | Dupilumab | 15 | 448 | $61,176.01 | — |
| Clobetasol Propionate | Clobetasol Propionate | 13 | 358 | $490.07 | — |
| Mometasone Furoate | Mometasone Furoate | 13 | 342 | $277.27 | 13 |
| Ketoconazole | Ketoconazole | 12 | 387 | $181.33 | — |
| Doxycycline Monohydrate | Doxycycline Monohydrate | 12 | 360 | $82.63 | — |
| Valacyclovir | Valacyclovir Hcl | 11 | 488 | $124.34 | — |
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: 2022-04-05NUCC 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.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20140930002870
TX
9234359910
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
James H Herndon Jr Md Pa
8230 Walnut Hill Ln, Dallas, TX 752314435
Phone: 2147395821
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 4716 ALLIANCE BOULEVARD, STE 700, PLANO, TX 750935389 (Tel: 4698006069)
Registered at 4716 ALLIANCE BLVD STE 700, PLANO, TX 750935389 (Tel: 4698006069)
NPI status registered as active in NPPES database
Registered at 12606 GREENVILLE AVE STE 200, DALLAS, TX 752431923 (Tel: 2142920073)
Registered at 12606 GREENVILLE AVE STE 200, DALLAS, TX 752431923 (Tel: 2142920073)
Recorded as DIANA LOSAK, PA-C
Physician Assistant (license number reported to NPPES: TX PA08206)
NPI status registered as active in NPPES database
Registered at 12606 GREENVILLE AVE STE 200, DALLAS, TX 752431923 (Tel: 2142920073)
Registered at 12606 GREENVILLE AVE STE 200, DALLAS, TX 752431923 (Tel: 2142920073)
Recorded as DIANA BARKSDALE, PA-C
Physician Assistant (license number reported to NPPES: TX PA08206)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Plano
- Katherine Mcdonell, PA-C
- Mary Mckee, PA
- Kimberly Subias
- Shauna Boyd, PA-C
- Alexandra Blaeser, PA-C
- Megan Calder
Mailing Address
4716 Alliance Blvd Ste 700
Plano, TX 750935389
Phone: 4698006069