Michael Gardner, MD
Endocrinology, Diabetes & Metabolism · Columbia, MONPI 1841397916
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $31,598 of the $39,931 with a category attached, or 79.1%. Dexcom, Inc. accounts for 86.5% of it on its own, with 6 other manufacturers making up the rest. 2025 is the largest year on record at $13,250, more than ten times the $764 reported in 2019.
Across 51 payments — averaging $782.96 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Dexcom, Inc.$35K
- Biotronik Inc.$4K
- Tandem Diabetes Care, Inc.$752
- Amryt Pharma Holdings Ltd$136
- Johnson & Johnson$73
- Medtronic$55
- plus $20 from 1 others
Across 42 payments — averaging $1290.19 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- CSL Behring$28K
- Chiesi USA, Inc.$26K
What the payments were for
- Speaking & faculty fees$31,59879%
- Travel & lodging$6,84217%
- Food & beverage$1,4704%
- Education$200%
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Dexcom, Inc. | 32 | $34,553 |
| Biotronik Inc. | 12 | $4,342 |
| Tandem Diabetes Care, Inc. | 3 | $752 |
| Amryt Pharma Holdings Ltd | 1 | $136 |
| Johnson & Johnson | 1 | $73 |
| Medtronic | 1 | $55 |
| Bayer | 1 | $20 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
- DEXCOM G7 GSS (161)$34,081
- DEXCOM STELO GLUCOSE BIOSENSOR$13,059
- t-slim insulin pump$732
- MYALEPT$136
How this compares
$39,931 in reported general payments places this provider in the 85th percentile of 182 endocrinology, diabetes & metabolism providers in Missouri.
See all endocrinology, diabetes & metabolism providers in Missouri →
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| JardianceEmpagliflozin | 33 | $22,680 |
| OzempicSemaglutide | 21 | $21,564 |
| Lantus SolostarInsulin Glargine,hum.Rec.Anlog | 53 | $8,016 |
| Humalog Kwikpen U-100Insulin Lispro | 20 | $5,641 |
| HumalogInsulin Lispro | 15 | $3,160 |
| Hydrocortisone | 36 | $2,536 |
| Novolog FlexpenInsulin Aspart | 12 | $2,482 |
| Levothyroxine Sodium | 244 | $2,368 |
| NovologInsulin Aspart | 16 | $1,133 |
| SynthroidLevothyroxine Sodium | 31 | $1,093 |
| Metformin Hcl ErMetformin Hcl | 54 | $783 |
| Fludrocortisone Acetate | 17 | $638 |
| Desmopressin Acetate | 16 | $386 |
| Rosuvastatin Calcium | 23 | $364 |
| Methimazole | 25 | $303 |
Paid to pharmacies, not to this prescriber.
Other endocrinology, diabetes & metabolism in Columbia
- Sonya AddisonColumbia$25K
- Sean HamlettColumbia$6K
- Ralph DudaSpringfield$644K
- Karen Chang-ChenChesterfield$640K
- Alan RaubaJefferson City$594K
- Jerome ThurmanSaint Charles$312K
- Janet McGillSaint Louis$212K
- Megan WoodSt. Louis$207K
- Ralph OiknineChesterfield$144K
- Jonben SvobodaSpringfield$142K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.