Ernest James Fox , PA
Physician Assistant • Tucson, AZ
5910 N La Cholla Blvd
Tucson, AZ 857413535
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 November 28, 2005; this date does not establish years in practice.
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Published CMS data list 5,792 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:
- Atorvastatin Calcium — 448 prescription fills, including refills.
- Ozempic (Semaglutide) — 383 prescription fills, including refills.
- Metformin Hcl — 342 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 78 records in the table · 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 Tucson, AZ (2024, 155 clinicians with data). Median for this group: 367. Middle half: 123 to 922.
More Part D prescriptions than 95% of clinicians listed under Physician Assistant in Arizona (2024, 1,917 clinicians with data). Median for this group: 260. Middle half: 86 to 858.
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 4,616 in 2020 to 5,792 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
5910 N La Cholla Blvd
Tucson, AZ 857413535
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 Tucson, AZ. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Tucson Endocrine Associates Pllc. 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
2000
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
14,001 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
$2,077,558 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: $323.83 across 16 records.
By nature of payment
- Food and Beverage: $323.83 across 16 records.
Reporting-company totals (3 largest of 13)
- Novo Nordisk Inc: $59.22 across 3 records.
- Medtronic, Inc.: $40.05 across 2 records.
- Madrigal Pharmaceuticals: $33.21 across 1 record.
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
26 years (graduated 2000)
CMS Doctors and Clinicians data list 2000 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
2005
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)
Ernest Fox 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 Ernest Fox 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 Tucson and Arizona
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 Tucson, AZ (2024, 155 clinicians with data). Median for this group: 367. Middle half: 123 to 922.
More Part D prescriptions than 95% of clinicians listed under Physician Assistant in Arizona (2024, 1,917 clinicians with data). Median for this group: 260. Middle half: 86 to 858.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in Tucson, AZ (2024, 155 clinicians with data). Median for this group: $8,322. Middle half: $1,211 to $160,281.
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in Arizona (2024, 1,917 clinicians with data). Median for this group: $4,301. Middle half: $765 to $83,048.
284 active clinicians are listed under Physician Assistant with a practice address in Tucson, AZ (3,673 in Arizona).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Tucson
10.9% of these 284 clinicians have the CMS telehealth indicator.
57.4% of these 284 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 25% from 4,616 in 2020 to 5,792 in 2024.
- 2020: 4,616
- 2021: 4,648
- 2022: 4,531
- 2023: 5,403
- 2024: 5,792
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30-day fills
30-day fills increased 40% from 9,966 in 2020 to 14,001 in 2024.
- 2020: 9,966
- 2021: 10,566
- 2022: 10,600
- 2023: 12,500
- 2024: 14,001
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Part D drug cost
Part D drug cost varied from year to year: $1,963,890 in 2020 and $2,077,558 in 2024.
- 2020: $1,963,890
- 2021: $2,224,170
- 2022: $2,052,298
- 2023: $2,703,147
- 2024: $2,077,558
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $51.11 in 2022 to $323.83 in 2025.
- 2022: $51.11
- 2023: $45.35
- 2024: $67.43
- 2025: $323.83
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 · 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): 16 records totaling $323.83.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
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REZDIFFRA | General | $33.21 |
| Dexcom, Inc. |
Food and Beverage
In-kind items and services
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Dexcom G6 Transmitter | General | $26.33 |
| Xeris Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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RECORLEV | General | $24.96 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Rybelsus | General | $24.64 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $21.38 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
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MINIMED 780G | General | $20.59 |
| Abbott Laboratories |
Food and Beverage
In-kind items and services
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FREESTYLE LIBRE 3 | General | $19.57 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
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MINIMED 780G | General | $19.46 |
| Amphastar Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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— | General | $19.17 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Ozempic | General | $18.35 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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EVENITY | General | $18.13 |
| Sequel Med Tech, LLC |
Food and Beverage
In-kind items and services
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TWIIST | General | $16.50 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Rybelsus | General | $16.23 |
| Amneal Pharmaceuticals LLC |
Food and Beverage
In-kind items and services
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UNITHROID | General | $15.82 |
| BETA BIONICS, INC. |
Food and Beverage
In-kind items and services
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iLet Bionic Pancreas | General | $15.60 |
| CeQur Corporation |
Food and Beverage
Cash or cash equivalent
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CeQur Simplicity | General | $13.89 |
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 | 448 | 37,117 | $4,604.05 | 135 |
| Ozempic | Semaglutide | 383 | 16,980 | $535,933.85 | 89 |
| Metformin Hcl | Metformin Hcl | 342 | 29,986 | $3,226.78 | 115 |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 326 | 26,292 | $71,211.92 | 119 |
| Nano 2nd Gen Pen Needle | Pen Needle, Diabetic | 251 | 17,716 | $30,895.68 | 97 |
| Levothyroxine Sodium | Levothyroxine Sodium | 238 | 19,661 | $2,391.12 | 74 |
| Glipizide | Glipizide | 222 | 19,224 | $2,700.47 | 78 |
| Jardiance | Empagliflozin | 180 | 8,601 | $171,239.56 | 32 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 178 | 14,538 | $3,050.91 | 62 |
| Lisinopril | Lisinopril | 176 | 15,146 | $1,340.91 | 58 |
| Pioglitazone Hcl | Pioglitazone Hcl | 161 | 13,421 | $1,930.36 | 48 |
| Metformin Hcl Er | Metformin Hcl | 158 | 13,234 | $1,607.80 | 55 |
| Humalog Kwikpen U-100 | Insulin Lispro | 136 | 10,074 | $47,482.87 | 53 |
| Trulicity | Dulaglutide | 131 | 6,244 | $205,424.52 | 35 |
| Ezetimibe | Ezetimibe | 121 | 10,140 | $2,593.95 | 42 |
| Losartan Potassium | Losartan Potassium | 120 | 10,292 | $1,107.20 | 39 |
| Lantus | Insulin Glargine,hum.Rec.Anlog | 105 | 6,229 | $20,009.29 | 31 |
| Novolog Flexpen | Insulin Aspart | 94 | 6,794 | $33,059.94 | 34 |
| Humalog | Insulin Lispro | 87 | 5,709 | $20,019.87 | 26 |
| Insulin Lispro Kwikpen U-100 | Insulin Lispro | 85 | 5,321 | $25,034.69 | 34 |
| Amlodipine Besylate | Amlodipine Besylate | 78 | 7,020 | $580.24 | 27 |
| Humalog Mix 75-25 Kwikpen | Insulin Lispro Protamin/Lispro | 78 | 4,022 | $21,497.31 | 22 |
| Rybelsus | Semaglutide | 75 | 4,650 | $145,214.68 | 21 |
| Tresiba Flextouch U-100 | Insulin Degludec | 69 | 5,206 | $65,401.77 | 25 |
| Insulin Lispro | Insulin Lispro | 68 | 3,395 | $4,889.80 | 17 |
(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: 2021-09-17NUCC 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
I20070515000153
AZ
3375640006
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
Tucson Endocrine Associates Pllc
5910 N La Cholla Blvd, Tucson, AZ 857413535
Phone: 5202970404
Tucson Endocrine Associates Pllc
1773 W St Marys Rd, Tucson, AZ 857452654
Phone: 5202970404
Secondary Practice Locations
1773 W Saint Marys Rd Ste 202
Tucson, AZ 857452654
Phone: 5202970404
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine - Endocrinology, Diabetes & Metabolism
Physician Assistant
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Master of Science in Nursing, Advanced Practice Registered Nurse, Family Nurse Practitioner (Certified)
Physician Assistant - Medical
Physician Assistant (Certified)
Nurse Practitioner - Family
Family Nurse Practitioner
Internal Medicine - Endocrinology, Diabetes & Metabolism
Doctor of Medicine (M.D.), FACP
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 5910 N LA CHOLLA BLVD, TUCSON, AZ 857413535 (Tel: 5202970404)
NPI status registered as active in NPPES database
Registered at 6050 N CORONA RD, SUITE 1, TUCSON, AZ 857041096 (Tel: 5202970404)
Registered at PO BOX 43160, TUCSON, AZ 857333160 (Tel: 5207223777)
Recorded as ERNEST FOX, PA
Physician Assistant
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Tucson
- Michael Klauder, PA
- Stephanie Biondo, PA
- Brittany Kasprzyk, PA-C
- Hossai Shah, PA
- Stephen Skiano, PA-C
- Rhetta Yuill, PA
Mailing Address
Po Box 43160
Tucson, AZ 857333160
Phone: 5207223777