Dr. Nathan Rex Duffin , DO
Internal Medicine โข Mesa, AZ
1301 S Crismon Rd
Mesa, AZ 852093767
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 Duffin is listed in NPPES under Internal Medicine.
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NPI assigned on May 30, 2012; this date does not establish years in practice.
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Published CMS data list 523 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:
- 99233 โ Subsequent hospital care with moderate levelof medical decision making: 273 service units.
- 99239 โ Hospital discharge day management: 114 service units.
- 99223 โ Initial hospital care with moderate level of medical decision making: 73 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 4 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 477 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 75 prescription fills, including refills.
- Tamsulosin Hcl โ 40 prescription fills, including refills.
- Lisinopril โ 35 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 23 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 60% of clinicians listed under Internal Medicine in Mesa, AZ (2024, 85 clinicians with data). Median for this group: 796. Middle half: 335 to 1,338.
Close to the middle for Medicare Part B services among 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 758 in 2020 to 523 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
1301 S Crismon Rd
Mesa, AZ 852093767
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: Pulmonary Consultants P.C.. 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
2006
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
184 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 $59,903 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 $46,355 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
505 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
$19,239 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.
Open Payments general payments, program year 2024
All general payments: $112.19 across 2 records.
By nature of payment
- Food and Beverage: $112.19 across 2 records.
Reporting-company totals
- Medtronic, Inc.: $112.19 across 2 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 2024 (published June 30, 2026).
Years since graduation
20 years (graduated 2006)
CMS Doctors and Clinicians data list 2006 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
2012
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
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. Duffin 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. Duffin 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 Mesa and Arizona
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 60% of clinicians listed under Internal Medicine in Mesa, AZ (2024, 85 clinicians with data). Median for this group: 796. Middle half: 335 to 1,338.
Close to the middle for 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 Mesa, AZ (2024, 85 clinicians with data). Median for this group: $79,050. Middle half: $44,083 to $134,535.
Close to the middle for 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 Mesa, AZ (2024, 85 clinicians with data). Median for this group: $61,297. Middle half: $32,555 to $113,097.
Close to the middle for 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
Close to the middle for clinicians listed under Internal Medicine in Mesa, AZ (2024, 91 clinicians with data). Median for this group: 681. Middle half: 161 to 5,024.
Close to the middle for 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
Close to the middle for clinicians listed under Internal Medicine in Mesa, AZ (2024, 91 clinicians with data). Median for this group: $34,477. Middle half: $9,158 to $433,369.
A lower Part D drug cost than 60% 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.
157 active clinicians are listed under Internal Medicine with a practice address in Mesa, AZ (2,856 in Arizona).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Mesa
14.6% of these 157 clinicians have the CMS telehealth indicator.
62.4% of these 157 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 decreased 31% from 758 in 2020 to 523 in 2024.
- 2020: 758
- 2021: 573
- 2022: 644
- 2023: 677
- 2024: 523
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Medicare-allowed amount
Medicare-allowed amount decreased 34% from $90,652 in 2020 to $59,903 in 2024.
- 2020: $90,652
- 2021: $62,766
- 2022: $71,872
- 2023: $82,427
- 2024: $59,903
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Paid by Medicare
Paid by Medicare decreased 35% from $71,126 in 2020 to $46,355 in 2024.
- 2020: $71,126
- 2021: $50,018
- 2022: $56,423
- 2023: $63,593
- 2024: $46,355
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 783% from 54 in 2019 to 477 in 2024.
- 2019: 54
- 2020: 108
- 2022: 40
- 2023: 273
- 2024: 477
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30-day fills
30-day fills increased 601% from 72 in 2019 to 505 in 2024.
- 2019: 72
- 2020: 146
- 2022: 40
- 2023: 384
- 2024: 505
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Part D drug cost
Part D drug cost went from $904 in 2019 to $19,239 in 2024.
- 2019: $904
- 2020: $5,228
- 2022: $327
- 2023: $13,334
- 2024: $19,239
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $33.26 in 2019 to $112.19 in 2024.
- 2019: $33.26
- 2021: $88.47
- 2023: $212.34
- 2024: $112.19
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (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.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2024 (payments made January 1 โ December 31, 2024): fewer than 11 records totaling $112.19.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
|
KYPHON EXPRESS II KYPHOPAK TRAY | General | $70.53 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
|
KYPHON EXPRESS II KYPHOPAK TRAY | General | $41.66 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ2023 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, 2017โ2024; 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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99233
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
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273 | 116 | $232.29 | $113.29 |
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99239
Hospital discharge day management, more than 30 minutes
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114 | 112 | $217.74 | $109.32 |
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99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
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73 | 72 | $308.52 | $163.89 |
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99497
Advance care planning, first 30 minutes
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63 | 63 | $155.00 | $72.20 |
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 | 75 | 2,430 | $809.53 | 23 |
| Tamsulosin Hcl | Tamsulosin Hcl | 40 | 1,200 | $578.08 | โ |
| Lisinopril | Lisinopril | 35 | 1,050 | $279.02 | 12 |
| Levothyroxine Sodium | Levothyroxine Sodium | 27 | 870 | $359.04 | โ |
| Metformin Hcl | Metformin Hcl | 24 | 980 | $357.68 | โ |
| Amlodipine Besylate | Amlodipine Besylate | 22 | 720 | $216.24 | โ |
| Trazodone Hcl | Trazodone Hcl | 22 | 704 | $371.96 | โ |
| Metoprolol Tartrate | Metoprolol Tartrate | 21 | 630 | $140.55 | โ |
| Mirtazapine | Mirtazapine | 21 | 690 | $342.88 | โ |
| Gabapentin | Gabapentin | 20 | 584 | $144.22 | โ |
| Latanoprost | Latanoprost | 18 | 484 | $715.74 | โ |
| Lovastatin | Lovastatin | 17 | 510 | $417.35 | โ |
| Metoprolol Succinate | Metoprolol Succinate | 17 | 570 | $293.63 | โ |
| Hydrochlorothiazide | Hydrochlorothiazide | 13 | 390 | $70.50 | โ |
| Zolpidem Tartrate | Zolpidem Tartrate | 13 | 390 | $114.51 | โ |
| Eliquis | Apixaban | 13 | 390 | $5,981.94 | โ |
| Quetiapine Fumarate | Quetiapine Fumarate | 12 | 360 | $172.61 | โ |
| Flecainide Acetate | Flecainide Acetate | 12 | 360 | $173.88 | โ |
| Xarelto | Rivaroxaban | 11 | 330 | $6,999.47 | โ |
| Omeprazole | Omeprazole | 11 | 330 | $107.97 | โ |
| Isosorbide Dinitrate | Isosorbide Dinitrate | 11 | 330 | $425.81 | โ |
| Amiodarone Hcl | Amiodarone Hcl | 11 | 330 | $101.81 | โ |
| Venlafaxine Hcl | Venlafaxine Hcl | 11 | 330 | $64.28 | โ |
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
NUCC 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.
NUCC Taxonomy Code: 390200000X
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20150603002592
AZ
8921329814
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
Pulmonary Consultants P.c.
6750 E Baywood Ave, Mesa, AZ 852061749
Phone: 4808357111112
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
Doctor of Osteopathic Medicine (D.O.)
Hospitalist
Doctor of Osteopathic Medicine (D.O.)
Anesthesiology
Doctor of Osteopathic Medicine (D.O.)
Surgery
Doctor of Osteopathic Medicine (D.O.)
Physician Assistant
Physician Assistant (Certified)
Nurse Anesthetist, Certified Registered
Career & Practice History
NPI enumerated May 30, 2012.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Mesa
- Dr. Robert Arashahi, MD
- Dr. Sai Prashanth Haranath, MD
- Dr. Sheryl Spadone, MD
- Dr. Prashant Khetpal, MD
- Dr. Mahmood Shahlapour, MD
- Dr. Ahmad Atallah, MD, MA
Mailing Address
1301 S Crismon Rd
Mesa, AZ 852093767