Mark Christiansen
Endocrinology, Diabetes & Metabolism · Walnut Creek, CANPI 1821108218
Payments from drug & device makers
What this record shows
The money is spread across several categories — consulting fees (48.2%), food and beverage and travel and lodging — rather than concentrated in one kind of arrangement. 10 manufacturers reported payments, led by Mannkind Corporation at 48.4% of the total. Reporting peaked in 2021 at $2,299 and has fallen 98.6% since, to $32 in 2025.
Across 34 payments — averaging $137.28 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Mannkind Corporation$2K
- Medtronic$1K
- Novo Nordisk$290
- Tandem Diabetes Care, Inc.$249
- Dexcom, Inc.$239
- Radius Health, Inc.$142
- plus $226 from 4 others
Across 3,758 payments — averaging $6139.68 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.
- Dexcom, Inc.$5.6M
- Senseonics, Incorporated$3.7M
- Medtronic$2.8M
- Eli Lilly$2.8M
- Abbott$2.3M
- Novo Nordisk AS$1.6M
- plus $4.2M from 14 others
What the payments were for
- Consulting fees$2,25048%
- Travel & lodging$60213%
- Food & beverage$1,52533%
- Education$2906%
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 |
|---|---|---|
| Mannkind Corporation | 2 | $2,261 |
| Medtronic(2 entities) | 10 | $1,261 |
| Novo Nordisk | 9 | $290 |
| Tandem Diabetes Care, Inc. | 2 | $249 |
| Dexcom, Inc. | 4 | $239 |
| Radius Health, Inc. | 2 | $142 |
| AstraZeneca | 1 | $108 |
| Boehringer Ingelheim | 1 | $42 |
| Senseonics, Incorporated | 1 | $40 |
| Ascensia Diabetes Care US Inc. | 2 | $36 |
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.
- AFREZZA$2,250
- MINIMED 780G$635
- Minimed 670G System$494
- t:slim X2 Insulin Pump with Control-IQ$249
- Tymlos$104
How this compares
$4,668 in reported general payments places this provider in the 70th percentile of 952 endocrinology, diabetes & metabolism providers in California.
See all endocrinology, diabetes & metabolism providers in California →
Other endocrinology, diabetes & metabolism in Walnut Creek
- Juan FriasSan Diego$1.4M
- Joselito CabaccanSan Jose$1.4M
- Daniel NadeauNewport Beach$1.2M
- Yehuda HandelsmanTarzana$1M
- Helen BaronRancho Mirage$958K
- Ken FujiokaSan Diego$747K
- Minou TranPico Rivera$663K
- James ChuMonterey$639K
- Anthony HeaneyLos Angeles$588K
- Daniel Einhornla Jolla$578K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.