Dr. Justin E. Fields, MD
Internal Medicine (Internal Medicine Physician)
- Medicare participating
At a glance
- Medical school
- University of Texas Medical Branch at Galveston (2007)
- Years since graduation
- 19
- In the NPI registry since
- 2007
- Medicare patients seen, 2024
- 354
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2007Medical school: University of Texas Medical Branch at Galveston
- 2007Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Internal Medicine Physician primary
OK license 25774 -
Pediatrics Physician
OK license 25774
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Mercy Hospital Oklahoma City, Inc Oklahoma City, OK
- Norman Regional Norman, OK
Medical groups
- Mercy Clinic Oklahoma Communities (649 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 354
- Services billed
- 2,414
- Patients’ average age
- 74
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 540 | 309 |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 261 | 261 |
| Injection of drug or substance under skin or into muscle | 112 | 26 |
| Administration of influenza virus vaccine | 92 | 91 |
| Influenza vaccine split virus, preservative free | 80 | 80 |
| Administration of pneumococcal vaccine | 50 | 50 |
| Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use | 48 | 48 |
| Established patient office or other outpatient visit, 20-29 minutes | 44 | 41 |
| Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg | 38 | 12 |
| Established patient office or other outpatient visit, 40-54 minutes | 37 | 32 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Atorvastatin Calcium Other prescribers in Norman, OK | 578 |
| Levothyroxine Sodium Other prescribers in Norman, OK | 308 |
| Amlodipine Besylate Other prescribers in Norman, OK | 262 |
| Losartan Potassium Other prescribers in Norman, OK | 252 |
| Omeprazole Other prescribers in Norman, OK | 212 |
| Lisinopril Other prescribers in Norman, OK | 210 |
| Metformin Hcl Other prescribers in Norman, OK | 177 |
| Gabapentin Other prescribers in Norman, OK | 153 |
| Hydrocodone-Acetaminophen (hydrocodone/acetaminophen) Other prescribers in Norman, OK | 144 |
| Metoprolol Succinate Other prescribers in Norman, OK | 130 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 15 companies reported 27 payments worth $518 in total to this clinician.
| Sumitomo Pharma America, Inc. | $96.90 |
|---|---|
| Vanda Pharmaceuticals Inc. | $63.37 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $50.67 |
| Lilly USA, LLC | $44.47 |
| Amgen Inc. | $34.02 |
| Pfizer Inc. | $29.76 |
| AbbVie Inc. | $29.50 |
| GlaxoSmithKline, LLC. | $27.72 |
| Food and Beverage | $518 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.