Dr. Aaron Matthew Fields , MD
Anesthesiology โข Dallas, TX
12222 Merit Dr Ste 600
Dallas, TX 752513294
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 August 17, 2007; this date does not establish years in practice.
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Published CMS data list 153 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:
- 76937 โ Ultrasonic guidance for blood vessel access: 36 service units.
- 36620 โ Insertion of artery tube for blood sampling or infusion through skin: 35 service units.
- 64999 โ Other procedure on nervous system: 20 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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More Medicare Part B services than 65% of clinicians listed under Anesthesiology in Dallas, TX (2024, 835 clinicians with data). Median for this group: 90. Middle half: 46 to 193.
More Medicare Part B services than 65% of clinicians listed under Anesthesiology in Texas (2024, 2,454 clinicians with data). Median for this group: 94. Middle half: 41 to 197.
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 149 in 2020 to 153 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
12222 Merit Dr Ste 600
Dallas, TX 752513294
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 3 distinct additional practice-address records in Dallas, TX; Fort Sam Houston, TX; Monroe, WI. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 3 distinct group names: Austin Anesthesiology Group Pllc; The Monroe Clinic, Inc.; U S Anesthesia Partners Of Texas, 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
Texas Tech University Health Science Center School Of Medicine
2003
What Public CMS Data Show
Anesthesiology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
125 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 $6,752 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 $5,385 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.
Open Payments general payments, program year 2025
All general payments: $50.52 across 3 records.
By nature of payment
- Food and Beverage: $50.52 across 3 records.
Reporting-company totals
- GlaxoSmithKline, LLC.: $50.52 across 3 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
23 years (graduated 2003)
CMS Doctors and Clinicians data list 2003 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
2007
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. Fields 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. Fields 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 Dallas and Texas
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 65% of clinicians listed under Anesthesiology in Dallas, TX (2024, 835 clinicians with data). Median for this group: 90. Middle half: 46 to 193.
More Medicare Part B services than 65% of clinicians listed under Anesthesiology in Texas (2024, 2,454 clinicians with data). Median for this group: 94. Middle half: 41 to 197.
Medicare-allowed amount
A lower Medicare-allowed amount than 70% of clinicians listed under Anesthesiology in Dallas, TX (2024, 835 clinicians with data). Median for this group: $12,189. Middle half: $5,790 to $24,581.
A lower Medicare-allowed amount than 65% of clinicians listed under Anesthesiology in Texas (2024, 2,454 clinicians with data). Median for this group: $10,803. Middle half: $4,556 to $22,244.
Paid by Medicare
A lower Medicare payment amount than 70% of clinicians listed under Anesthesiology in Dallas, TX (2024, 835 clinicians with data). Median for this group: $9,678. Middle half: $4,616 to $19,316.
A lower Medicare payment amount than 65% of clinicians listed under Anesthesiology in Texas (2024, 2,454 clinicians with data). Median for this group: $8,494. Middle half: $3,590 to $17,455.
1,394 active clinicians are listed under Anesthesiology with a practice address in Dallas, TX (4,638 in Texas).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Dallas
0.6% of these 1,394 clinicians have the CMS telehealth indicator.
77.3% of these 1,394 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: 149 in 2020 and 153 in 2024.
- 2020: 149
- 2021: 225
- 2022: 304
- 2023: 125
- 2024: 153
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Medicare-allowed amount
Medicare-allowed amount decreased 49% from $13,157 in 2020 to $6,752 in 2024.
- 2020: $13,157
- 2021: $14,342
- 2022: $22,572
- 2023: $9,751
- 2024: $6,752
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Paid by Medicare
Paid by Medicare decreased 48% from $10,377 in 2020 to $5,385 in 2024.
- 2020: $10,377
- 2021: $11,485
- 2022: $18,040
- 2023: $7,581
- 2024: $5,385
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $167.27 in 2019 to $50.52 in 2025.
- 2019: $167.27
- 2020: $15.96
- 2021: $13.66
- 2023: $57.38
- 2025: $50.52
Sources: CMS Medicare Physician & Other Practitioners (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): fewer than 11 records totaling $50.52.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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BEXSERO | General | $18.11 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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AREXVY | General | $17.40 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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SHINGRIX | General | $15.01 |
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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76937
Ultrasonic guidance for blood vessel access
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36 | 34 | $385.00 | $13.03 |
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36620
Insertion of artery tube for blood sampling or infusion through skin
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35 | 35 | $714.00 | $41.40 |
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64999
Other procedure on nervous system
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20 | 20 | $991.65 | $56.03 |
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76942
Ultrasonic guidance for needle placement
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19 | 19 | $1067.00 | $28.34 |
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64447
Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve)
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18 | 18 | $1666.00 | $37.98 |
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64488
Injection of local anesthetic for abdominal wall pain control on both sides using imaging guidance
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13 | 13 | $1395.00 | $64.69 |
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00731
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope
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12 | 12 | $2327.25 | $137.51 |
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.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2025-06-09NUCC Taxonomy Code: 207L00000X
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
NUCC Taxonomy Code: 207L00000X
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
NUCC Taxonomy Code: 207LC0200X
An anesthesiologist, who specializes in critical care medicine diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - ANESTHESIOLOGY
I20250528000711
WI
3476875345
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
U S Anesthesia Partners Of Texas, Pa
1139 E Sonterra Blvd, San Antonio, TX 782584347
Phone: 2106382100
The Monroe Clinic, Inc.
2009 5th St, Monroe, WI 535661546
Phone: 6083242000
U S Anesthesia Partners Of Texas, Pa
7930 Floyd Curl Dr, San Antonio, TX 782293925
Phone: 2102975000
U S Anesthesia Partners Of Texas, Pa
8811 Village Dr, San Antonio, TX 782175415
Phone: 2102972000
U S Anesthesia Partners Of Texas, Pa
520 Madison Oak Dr, San Antonio, TX 782583913
Phone: 2102974000
U S Anesthesia Partners Of Texas, Pa
12412 Judson Rd, Live Oak, TX 782333255
Phone: 2107577000
U S Anesthesia Partners Of Texas, Pa
100 Medical Dr, Lake Jackson, TX 775665674
Phone: 7134967555
Austin Anesthesiology Group Pllc
1109 Rock Prairie Rd, College Station, TX 778458651
Phone: 9796945200
U S Anesthesia Partners Of Texas, Pa
9250 Pinecroft Dr, Shenandoah, TX 773803218
Phone: 7136204000
U S Anesthesia Partners Of Texas, Pa
111 Dallas St, San Antonio, TX 782051201
Phone: 2102977000
Secondary Practice Locations
3551 Roger Brooke Dr, Mche-Qd (Creds)
Fort Sam Houston, TX 782344504
Phone: 2109162316
6606 Lbj Fwy Ste 200
Dallas, TX 752406524
Phone: 9727155000
515 22nd Ave
Monroe, WI 535661569
Phone: 6083241000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Anesthesiology
Doctor of Medicine (M.D.)
Anesthesiology
Doctor of Medicine (M.D.)
Nurse Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Anesthesiology
Doctor of Medicine (M.D.)
Anesthesiology
Doctor of Medicine (M.D.)
Anesthesiologist Assistant
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Anesthesiology (license number reported to NPPES: WI 48532-020)
Registered at 12222 MERIT DR STE 600, DALLAS, TX 752513294 (Tel: 9727155000)
Registered at 6606 LBJ FWY STE 200, DALLAS, TX 752406524 (Tel: 9727155000)
Registered at PO BOX 840853, DALLAS, TX 752845116 (Tel: 9722331999)
Anesthesiology (license number reported to NPPES: WI 48532-020)
Anesthesiology (license number reported to NPPES: TX Q0255)
NPI status registered as active in NPPES database
Registered at 3551 ROGER BROOKE DR, MCHE-QD (CREDS), FORT SAM HOUSTON, TX 782344504 (Tel: 2109162316)
Registered at 413 ARGO AVE, SAN ANTONIO, TX 782095116 (Tel: 2106305124)
Recorded as AARON FIELDS, MD
Anesthesiology (license number reported to NPPES: WI 48532-020)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Anesthesiology Specialists in Dallas
- Dr. Austin Street, MD
- Dr. Fallon Ngo, DO
- Dr. Kirbie Broughton, MD
- Dr. Duane Hilliard, MD
- Dr. Houman Koopaei, MD
- Dr. Joy Gathe-Ghermay, MD
Mailing Address
Po Box 840853
Dallas, TX 752845116
Phone: 9722331999