Dr. Patrick Michael Chiasson , MD
Surgery โข Tucson, AZ
6230 N La Cholla Blvd Ste 250
Tucson, AZ 857413529
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 April 21, 2006; this date does not establish years in practice.
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Published CMS data list 455 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:
- 99213 โ Established patient outpatient office visit: 119 service units.
- 99214 โ Established patient outpatient office visit: 84 service units.
- 99204 โ New patient outpatient office visit: 77 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 10 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 638 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:
- Omeprazole โ 128 prescription fills, including refills.
- Ondansetron Odt (Ondansetron) โ 118 prescription fills, including refills.
- Celecoxib โ 79 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 13 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 80% of clinicians listed under Surgery in Tucson, AZ (2024, 50 clinicians with data). Median for this group: 239. Middle half: 137 to 398.
More Medicare Part B services than 80% of clinicians listed under Surgery in Arizona (2024, 329 clinicians with data). Median for this group: 205. Middle half: 94 to 355.
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 494 in 2020 to 455 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
6230 N La Cholla Blvd Ste 250
Tucson, AZ 857413529
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: Northwest Allied Physicians Llc. 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
1987
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
175 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 $89,005 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 $68,634 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
908 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
$26,469 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 2025
All general payments: $6,625.03 across 11 records.
By nature of payment
- Consulting Fee: $5,830.00 across 1 record.
- Food and Beverage: $477.20 across 7 records.
- Travel and Lodging: $317.83 across 3 records.
Reporting-company totals (3 largest of 6)
- Ethicon Inc.: $5,895.91 across 3 records.
- INTUITIVE SURGICAL, INC.: $426.09 across 4 records.
- Medical Device Business Services, Inc.: $146.42 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
39 years (graduated 1987)
CMS Doctors and Clinicians data list 1987 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
2006
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. Chiasson 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. Chiasson 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 B services
More Medicare Part B services than 80% of clinicians listed under Surgery in Tucson, AZ (2024, 50 clinicians with data). Median for this group: 239. Middle half: 137 to 398.
More Medicare Part B services than 80% of clinicians listed under Surgery in Arizona (2024, 329 clinicians with data). Median for this group: 205. Middle half: 94 to 355.
Medicare-allowed amount
A higher Medicare-allowed amount than 85% of clinicians listed under Surgery in Tucson, AZ (2024, 50 clinicians with data). Median for this group: $36,739. Middle half: $15,717 to $58,489.
A higher Medicare-allowed amount than 85% of clinicians listed under Surgery in Arizona (2024, 329 clinicians with data). Median for this group: $29,825. Middle half: $11,238 to $59,436.
Paid by Medicare
A higher Medicare payment amount than 85% of clinicians listed under Surgery in Tucson, AZ (2024, 50 clinicians with data). Median for this group: $28,744. Middle half: $11,556 to $46,114.
A higher Medicare payment amount than 85% of clinicians listed under Surgery in Arizona (2024, 329 clinicians with data). Median for this group: $23,099. Middle half: $8,485 to $45,817.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under Surgery in Tucson, AZ (2024, 63 clinicians with data). Median for this group: 42. Middle half: 15 to 146.
More Part D prescriptions than 95% of clinicians listed under Surgery in Arizona (2024, 306 clinicians with data). Median for this group: 51. Middle half: 22 to 131.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Surgery in Tucson, AZ (2024, 63 clinicians with data). Median for this group: $317. Middle half: $49 to $1,236.
A higher Part D drug cost than 95% of clinicians listed under Surgery in Arizona (2024, 306 clinicians with data). Median for this group: $331. Middle half: $98 to $1,126.
179 active clinicians are listed under Surgery with a practice address in Tucson, AZ (760 in Arizona).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Tucson
6.7% of these 179 clinicians have the CMS telehealth indicator.
30.7% of these 179 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 varied from year to year: 494 in 2020 and 455 in 2024.
- 2020: 494
- 2021: 522
- 2022: 396
- 2023: 527
- 2024: 455
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Medicare-allowed amount
Medicare-allowed amount decreased 14% from $103,660 in 2020 to $89,005 in 2024.
- 2020: $103,660
- 2021: $119,320
- 2022: $80,981
- 2023: $124,258
- 2024: $89,005
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Paid by Medicare
Paid by Medicare decreased 15% from $80,733 in 2020 to $68,634 in 2024.
- 2020: $80,733
- 2021: $93,495
- 2022: $61,849
- 2023: $97,012
- 2024: $68,634
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 137% from 269 in 2020 to 638 in 2024.
- 2020: 269
- 2021: 396
- 2022: 554
- 2023: 663
- 2024: 638
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30-day fills
30-day fills increased 158% from 352 in 2020 to 908 in 2024.
- 2020: 352
- 2021: 519
- 2022: 740
- 2023: 879
- 2024: 908
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Part D drug cost
Part D drug cost increased 120% from $12,021 in 2020 to $26,469 in 2024.
- 2020: $12,021
- 2021: $16,117
- 2022: $31,179
- 2023: $32,818
- 2024: $26,469
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $36.91 in 2021 to $6,625.03 in 2025.
- 2021: $36.91
- 2022: $12,135.58
- 2023: $9,277.81
- 2024: $17,719.64
- 2025: $6,625.03
Sources: CMS Medicare Physician & Other Practitioners (2024), 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 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 2025 (payments made January 1 โ December 31, 2025): 11 records totaling $6,625.03.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Ethicon Inc. |
Consulting Fee
Cash or cash equivalent
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โ | General | $5,830.00 |
| INTUITIVE SURGICAL, INC. |
Travel and Lodging
In-kind items and services
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Da Vinci Surgical System | General | $215.83 |
| Medical Device Business Services, Inc. |
Food and Beverage
In-kind items and services
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Echelon Flex | General | $146.42 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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โ | General | $115.13 |
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $108.26 |
| INTUITIVE SURGICAL, INC. |
Travel and Lodging
In-kind items and services
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Da Vinci Surgical System | General | $83.00 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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Harmonic | General | $58.70 |
| Olympus America Inc. |
Food and Beverage
In-kind items and services
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VISERA 4K UHD CAMERA CONTROL UNIT | General | $23.61 |
| INTUITIVE SURGICAL, INC. |
Travel and Lodging
In-kind items and services
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Da Vinci Surgical System | General | $19.00 |
| Phathom Pharmaceuticals, Inc. |
Food and Beverage
Cash or cash equivalent
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VOQUEZNA | General | $17.87 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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Enseal | General | $7.21 |
Source: CMS Open Payments, program year 2025, 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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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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119 | 79 | $200.00 | $89.60 |
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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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84 | 70 | $296.00 | $126.31 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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77 | 77 | $456.00 | $164.56 |
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43239
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope
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50 | 50 | $739.00 | $125.30 |
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91035
Monitoring and recording of esophageal function through a capsule attached to the esophagus wall
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31 | 31 | $233.00 | $78.79 |
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43235
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope
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28 | 28 | $649.00 | $110.26 |
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91010
Study of esophagus to assess movement
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21 | 21 | $190.00 | $62.59 |
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43282
Repair of hernia of muscle at esophagus and stomach with implantation of mesh using an endoscope
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20 | 20 | $4917.05 | $1677.19 |
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43249
Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm
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13 | 12 | $466.00 | $149.14 |
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47562
Removal of gallbladder using an endoscope
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12 | 12 | $1969.00 | $539.12 |
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 |
|---|---|---|---|---|---|
| Omeprazole | Omeprazole | 128 | 6,978 | $2,021.34 | 58 |
| Ondansetron Odt | Ondansetron | 118 | 1,257 | $1,920.33 | 90 |
| Celecoxib | Celecoxib | 79 | 338 | $301.11 | 75 |
| Famotidine | Famotidine | 62 | 3,629 | $861.27 | 25 |
| Pantoprazole Sodium | Pantoprazole Sodium | 58 | 3,674 | $700.37 | 23 |
| Ursodiol | Ursodiol | 48 | 1,890 | $3,346.00 | 17 |
| Aprepitant | Aprepitant | 43 | 256 | $1,992.69 | 40 |
| Oxycodone Hcl | Oxycodone Hcl | 23 | 65 | $61.70 | 20 |
| Eliquis | Apixaban | 20 | 600 | $11,845.11 | 20 |
| Sucralfate | Sucralfate | 18 | 520 | $1,380.87 | 12 |
| Scopolamine | Scopolamine | 18 | 80 | $270.84 | 17 |
| Ondansetron Hcl | Ondansetron Hcl | 12 | 75 | $91.75 | โ |
| Colestipol Hcl | Colestipol Hcl | 11 | 910 | $1,675.84 | 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
Self-certified to NPPES: 2021-11-18NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
NUCC Taxonomy Code: 174400000X
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GENERAL SURGERY
I20051025000313
AZ
1456336072
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
Northwest Allied Physicians Llc
6130 N La Cholla Blvd, Tucson, AZ 857413698
Northwest Allied Physicians Llc
6200 N La Cholla Blvd, Tucson, AZ 857413529
Phone: 5204698100
Northwest Allied Physicians Llc
8333 N Silverbell Rd, Tucson, AZ 857437371
Phone: 5202027770
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner - Family
Family Nurse Practitioner
Surgery
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant (Certified)
Dietitian, Registered
Registered Dietitian, CSOWM
Nurse Practitioner - Family
Family Nurse Practitioner
Colon & Rectal Surgery
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 6230 N LA CHOLLA BLVD STE 250, TUCSON, AZ 857413529 (Tel: 5202198690)
Registered at 6230 N LA CHOLLA BLVD STE 250, TUCSON, AZ 857413529 (Tel: 5202198690)
NPI status registered as active in NPPES database
Registered at 6320 N LA CHOLLA BLVD, SUITE 380, TUCSON, AZ 85741 (Tel: 5202198690)
Registered at 6320 N LA CHOLLA BLVD, SUITE 380, TUCSON, AZ 85741 (Tel: 5202198690)
Recorded as PATRICK CHIASSON, MD
Specialist (license number reported to NPPES: AZ 29820)
NPI status registered as active in NPPES database
Registered at 6320 N LA CHOLLA BLVD, SUITE 380, TUCSON, AZ 85741 (Tel: 5202198690)
Registered at 6320 N LA CHOLLA BLVD, SUITE 380, TUCSON, AZ 85741 (Tel: 5202198690)
Recorded as PATRICK CHIASSON, MD
Specialist (license number reported to NPPES: AZ 29820)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Surgery Specialists in Tucson
- Dr. Lindsey Butts, DO
- Michelle Chang
- Dr. James Chababi, MD
- Dr. Kelly Favre, MD
- Dr. Tony Friday, MD
- Dr. Christine Lovato, MD
Mailing Address
6230 N La Cholla Blvd Ste 250
Tucson, AZ 857413529
Phone: 5202198690