Dr. David F. Johnson, MD
Endocrinology & Diabetes (Endocrinology, Diabetes & Metabolism Physician)
1045 N 30th St
Billings, MT 59101
Who else practices at this address →
Yellowstone County is a federal mental health shortage area. About shortage areas
- Medicare participating
At a glance
- Medical school
- Un of California, Irvine, College of Medicine (1987)
- Years since graduation
- 39
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 521
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
- 1987Medical school: Un of California, Irvine, College of Medicine
- 2006Registered 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
-
Endocrinology, Diabetes & Metabolism Physician primary
MT license 7381
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Billings Clinic Hospital Billings, MT
- Sheridan Memorial Hospital Sheridan, WY
- Powell Valley Hospital Powell, WY
- Glendive Medical Center Glendive, MT
- Beartooth Billings Clinic Red Lodge, MT
Medical groups
- Billings Clinic Specialty Supplies and Services, LLC (824 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
- 521
- Services billed
- 1,079
- Patients’ average age
- 73
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 401 | 318 |
| Established patient office or other outpatient visit, 40-54 minutes | 164 | 143 |
| Established patient office or other outpatient visit, 20-29 minutes | 74 | 70 |
| New patient office or other outpatient visit, 60-74 minutes | 54 | 54 |
| New patient office or other outpatient visit, 45-59 minutes | 32 | 32 |
| Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report | 21 | 15 |
| Fine needle aspiration biopsy using ultrasound guidance, first growth | 14 | 13 |
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 |
|---|---|
| Levothyroxine Sodium Other prescribers in Billings, MT | 782 |
| Synthroid (levothyroxine sodium) Other prescribers in Billings, MT | 151 |
| Methimazole Other prescribers in Billings, MT | 125 |
| Levoxyl (levothyroxine sodium) Other prescribers in Billings, MT | 96 |
| Liothyronine Sodium Other prescribers in Billings, MT | 87 |
| Hydrocortisone Other prescribers in Billings, MT | 87 |
| Testosterone Other prescribers in Billings, MT | 83 |
| Ozempic (semaglutide) Other prescribers in Billings, MT | 64 |
| Alendronate Sodium Other prescribers in Billings, MT | 55 |
| Calcitonin-Salmon (calcitonin,salmon,synthetic) Other prescribers in Billings, MT | 48 |
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, 3 companies reported 5 payments worth $223 in total to this clinician.
| Madrigal Pharmaceuticals | $150 |
|---|---|
| Novartis Pharmaceuticals Corporation | $45.49 |
| Sanofi-aventis U.S. LLC | $27.13 |
| Food and Beverage | $223 |
|---|
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.
Industry-funded research
Named as a principal investigator on 4 industry-funded studies in 2025, from 2 companies. The companies reported $236,432 in research payments for these studies, mostly to the institutions running them.
- A Study to Assess the Safety and Efficacy of Oral Armour Thyroid Compared to Synthetic T4 for the Treatment of Primary Hypothyroidism in Adult Participants
AbbVie Inc. · Active, not recruiting · NCT06345339 - A Study of Tirzepatide (LY3298176) on the Reduction on Morbidity and Mortality in Adults With Obesity
Eli Lilly and Company · Active, not recruiting · NCT05556512 - A Study of Tirzepatide (LY3298176) Compared With Dulaglutide on Major Cardiovascular Events in Participants With Type 2 Diabetes
Eli Lilly and Company · Completed · NCT04255433 - M21-341 - A Study to Assess the Safety and Efficacy of Oral Armour Thyroid Compared to Synthetic T4 for the Treatment of Primary Hypothyroidism in Adult Participants
AbbVie Inc.
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.