Dr. Nathan John Dennison , DO
Internal Medicine โข Phoenix, AZ
500 W Thomas Rd Ste 900a
Phoenix, AZ 850134223
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. Nathan Dennison is listed in NPPES under Internal Medicine.
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NPI assigned on March 24, 2018; this date does not establish years in practice.
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Published CMS data list 376 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99214 โ Established patient outpatient office visit: 161 service units.
- G0439 โ Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit: 64 service units.
- 99213 โ Established patient outpatient office visit: 48 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 7 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 4,028 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ 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 โ 339 prescription fills, including refills.
- Amlodipine Besylate โ 211 prescription fills, including refills.
- Levothyroxine Sodium โ 209 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 90 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Close to the middle for Medicare Part B services among clinicians listed under Internal Medicine in Phoenix, AZ (2024, 373 clinicians with data). Median for this group: 446. Middle half: 159 to 982.
Fewer Medicare Part B services than 60% of clinicians listed under Internal Medicine in Arizona (2024, 1,490 clinicians with data). Median for this group: 660. Middle half: 239 to 1,415.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 30 in 2021 to 376 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021โ2024.
Practice Location & Contact Primary Location
500 W Thomas Rd Ste 900a
Phoenix, AZ 850134223
NPPES lists 1 additional practice-address record in Phoenix, AZ. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Sjhmc Physician Services. 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
2018
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
178 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $41,914 in 2024
The total amount Medicare approved for these services in 2024. 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 โ by Provider and Service, 2024.
Paid by Medicare
About $32,829 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, 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 โ by Provider and Service, 2024.
30-day fills
9,318 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
$428,644 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 โ by Provider and Drug, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019โ2025.
Years since graduation
8 years (graduated 2018)
CMS Doctors and Clinicians data list 2018 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
2018
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, โDoes your provider accept Medicare as full payment?โ
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)
Dr. Dennison 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. Dennison 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 Phoenix and Arizona
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Close to the middle for clinicians listed under Internal Medicine in Phoenix, AZ (2024, 373 clinicians with data). Median for this group: 446. Middle half: 159 to 982.
Fewer Medicare Part B services than 60% of clinicians listed under Internal Medicine in Arizona (2024, 1,490 clinicians with data). Median for this group: 660. Middle half: 239 to 1,415.
Medicare-allowed amount
Close to the middle for clinicians listed under Internal Medicine in Phoenix, AZ (2024, 373 clinicians with data). Median for this group: $44,314. Middle half: $15,627 to $100,914.
A lower Medicare-allowed amount than 60% of clinicians listed under Internal Medicine in Arizona (2024, 1,490 clinicians with data). Median for this group: $65,346. Middle half: $23,883 to $130,469.
Paid by Medicare
Close to the middle for clinicians listed under Internal Medicine in Phoenix, AZ (2024, 373 clinicians with data). Median for this group: $33,348. Middle half: $12,406 to $79,103.
A lower Medicare payment amount than 60% of clinicians listed under Internal Medicine in Arizona (2024, 1,490 clinicians with data). Median for this group: $49,013. Middle half: $18,074 to $101,661.
Medicare Part D prescriptions
More Part D prescriptions than 80% of clinicians listed under Internal Medicine in Phoenix, AZ (2024, 368 clinicians with data). Median for this group: 567. Middle half: 99 to 2,638.
More Part D prescriptions than 70% of clinicians listed under Internal Medicine in Arizona (2024, 1,528 clinicians with data). Median for this group: 880. Middle half: 133 to 4,108.
Part D drug cost
A higher Part D drug cost than 85% of clinicians listed under Internal Medicine in Phoenix, AZ (2024, 368 clinicians with data). Median for this group: $39,009. Middle half: $2,046 to $246,801.
A higher Part D drug cost than 80% of clinicians listed under Internal Medicine in Arizona (2024, 1,528 clinicians with data). Median for this group: $61,022. Middle half: $6,648 to $325,439.
697 active clinicians are listed under Internal Medicine with a practice address in Phoenix, AZ (2,856 in Arizona).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Phoenix
16.6% of these 697 clinicians have the CMS telehealth indicator.
58.8% of these 697 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 1153% from 30 in 2021 to 376 in 2024.
- 2021: 30
- 2022: 471
- 2023: 488
- 2024: 376
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Medicare-allowed amount
Medicare-allowed amount increased 995% from $3,828 in 2021 to $41,914 in 2024.
- 2021: $3,828
- 2022: $47,286
- 2023: $54,902
- 2024: $41,914
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Paid by Medicare
Paid by Medicare increased 972% from $3,062 in 2021 to $32,829 in 2024.
- 2021: $3,062
- 2022: $36,347
- 2023: $42,722
- 2024: $32,829
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 8120% from 49 in 2020 to 4,028 in 2024.
- 2020: 49
- 2021: 49
- 2022: 3,690
- 2023: 4,888
- 2024: 4,028
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30-day fills
30-day fills increased 11236% from 82 in 2020 to 9,318 in 2024.
- 2020: 82
- 2021: 120
- 2022: 7,497
- 2023: 10,567
- 2024: 9,318
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Part D drug cost
Part D drug cost increased 6682% from $6,320 in 2020 to $428,644 in 2024.
- 2020: $6,320
- 2021: $1,207
- 2022: $307,733
- 2023: $490,875
- 2024: $428,644
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2020โ2023 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 โ by Provider and Service data, 2021โ2024; 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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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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161 | 101 | $292.45 | $123.86 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
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64 | 64 | $319.00 | $126.16 |
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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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48 | 42 | $192.10 | $86.78 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
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44 | 34 | $403.00 | $175.34 |
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83036
Hemoglobin a1c level
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27 | 21 | $21.00 | $9.52 |
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G0008
Administration of influenza virus vaccine
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17 | 17 | $67.00 | $31.38 |
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90653
Influenza vaccine, inactivated
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15 | 15 | $235.00 | $81.82 |
Source: CMS Part B by Provider and Service, 2024; 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 |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 339 | 27,775 | $2,877.73 | 111 |
| Amlodipine Besylate | Amlodipine Besylate | 211 | 16,836 | $1,080.15 | 66 |
| Levothyroxine Sodium | Levothyroxine Sodium | 209 | 15,878 | $2,172.66 | 52 |
| Lisinopril | Lisinopril | 176 | 12,979 | $1,085.60 | 46 |
| Metformin Hcl | Metformin Hcl | 175 | 13,097 | $1,193.64 | 46 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 145 | 4,749 | $3,427.54 | 41 |
| Omeprazole | Omeprazole | 135 | 9,734 | $1,998.07 | 40 |
| Pantoprazole Sodium | Pantoprazole Sodium | 125 | 9,416 | $1,591.03 | 40 |
| Gabapentin | Gabapentin | 124 | 8,404 | $2,642.20 | 35 |
| Losartan Potassium | Losartan Potassium | 119 | 9,914 | $1,069.88 | 42 |
| Tamsulosin Hcl | Tamsulosin Hcl | 87 | 7,260 | $897.64 | 28 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 80 | 6,840 | $572.88 | 22 |
| Montelukast Sodium | Montelukast Sodium | 77 | 5,748 | $819.19 | 24 |
| Fluticasone Propionate | Fluticasone Propionate | 73 | 4,055 | $1,327.96 | 31 |
| Metoprolol Succinate | Metoprolol Succinate | 70 | 4,740 | $706.48 | 21 |
| Metoprolol Tartrate | Metoprolol Tartrate | 67 | 5,100 | $318.00 | 23 |
| Famotidine | Famotidine | 66 | 5,221 | $1,231.55 | 24 |
| Simvastatin | Simvastatin | 65 | 4,353 | $429.08 | 13 |
| Duloxetine Hcl | Duloxetine Hcl | 64 | 4,422 | $1,589.01 | 14 |
| Allopurinol | Allopurinol | 52 | 2,796 | $394.66 | 14 |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 51 | 2,619 | $8,750.81 | 13 |
| Alendronate Sodium | Alendronate Sodium | 50 | 3,888 | $296.30 | 14 |
| Mounjaro | Tirzepatide | 48 | 1,570 | $59,637.01 | โ |
| Jardiance | Empagliflozin | 47 | 3,210 | $58,614.86 | 13 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 46 | 1,357 | $947.95 | โ |
(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: 2024-12-13NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20210806000247
AZ
1951705300
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
Sjhmc Physician Services
500 W Thomas Rd, Phoenix, AZ 850134223
Phone: 6024063540
Secondary Practice Locations
350 W Thomas Rd
Phoenix, AZ 850134409
Phone: 6024065590
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
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Osteopathic Medicine (D.O.)
Internal Medicine
Nurse Practitioner - Adult Health
Adult Nurse Practitioner
Psychiatry & Neurology - Neurology
Doctor of Medicine (M.D.)
Family Medicine
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 500 W THOMAS RD STE 900A, PHOENIX, AZ 850134223 (Tel: 6024063540)
Registered at PO BOX 33269, PHOENIX, AZ 850673269 (Tel: 6024064786)
Internal Medicine (license number reported to NPPES: AZ 009133)
NPI status registered as active in NPPES database
Registered at 350 W THOMAS RD, PHOENIX, AZ 850134409 (Tel: 6024063540)
Registered at 350 W THOMAS RD, PHOENIX, AZ 850134409 (Tel: 6024063540)
Recorded as NATHAN DENNISON, DO
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Phoenix
- Dr. Alexander Renpenning Carrasco, MD
- Dr. Spogmai Khan, MD
- Dr. Patrick Haarhues, MD
- Dr. Divya Pramod Nimmatoori, MD
- Dr. Dru Dethlefs, DO
- Dr. Kenneth Levy, MD
Mailing Address
Po Box 33269
Phoenix, AZ 850673269
Phone: 6024064786