Dr. Michael R. Nannenga, MD
Endocrinology & Diabetes (Endocrinology, Diabetes & Metabolism Physician)
- Medicare participating
At a glance
- Medical school
- Indiana University School of Medicine (2005)
- Years since graduation
- 21
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 507
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
- 2005Medical school: Indiana University School 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
TN license MD46522 -
Internal Medicine Physician
TN license MD46522
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Wellmont Holston Valley Medical Center Kingsport, TN
- Clinch Valley Medical Center Richlands, VA
Medical groups
- Holston Medical Group PC (238 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
- 507
- Services billed
- 924
- Patients’ average age
- 73
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 582 | 366 |
| Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report | 122 | 57 |
| Established patient office or other outpatient visit, 20-29 minutes | 101 | 99 |
| New patient office or other outpatient visit, 45-59 minutes | 58 | 58 |
| Insertion of needle into vein for collection of blood sample | 43 | 42 |
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 Kingsport, TN | 1,507 |
| Methimazole Other prescribers in Kingsport, TN | 352 |
| Synthroid (levothyroxine sodium) Other prescribers in Kingsport, TN | 310 |
| Lantus Solostar (insulin glargine,hum.rec.anlog) Other prescribers in Kingsport, TN | 258 |
| Ozempic (semaglutide) Other prescribers in Kingsport, TN | 219 |
| Metformin Hcl Er (metformin hcl) Other prescribers in Kingsport, TN | 187 |
| Novolog Flexpen (insulin aspart) Other prescribers in Kingsport, TN | 173 |
| Mounjaro (tirzepatide) Other prescribers in Kingsport, TN | 172 |
| Metformin Hcl Other prescribers in Kingsport, TN | 168 |
| Jardiance (empagliflozin) Other prescribers in Kingsport, TN | 145 |
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, 1 companies reported 2 payments worth $36.44 in total to this clinician.
| Novo Nordisk Inc | $36.44 |
|---|
| Food and Beverage | $36.44 |
|---|
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.