Donald Clem
Periodontics · Fullerton, CANPI 1770673287
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $26,995 of the $38,952 with a category attached, or 69.3%. 13 manufacturers reported payments, led by Geistlich Pharma, North America, Inc. at 47.2% of the total. Reporting peaked in 2023 at $15,877 and has fallen 97.8% since, to $343 in 2025. Among periodontics clinicians in CA with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 88 payments — averaging $442.64 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Geistlich Pharma, North America, Inc.$18K
- Henry Schein, Inc.$9K
- J. Morita USA, Inc.$8K
- Dentsply Sirona Inc$1K
- Nobel Biocare USA$1K
- Straumann USA LLC$901
- plus $1K from 7 others
Across 13 payments — averaging $33,621 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.
- J. Morita USA, Inc.$246K
- Geistlich Pharma, North America, Inc.$191K
What the payments were for
- Consulting fees$5,00013%
- Speaking & faculty fees$26,99569%
- Travel & lodging$1,6154%
- Food & beverage$3,95310%
- Education$1,3333%
- Entertainment$560%
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 |
|---|---|---|
| Geistlich Pharma, North America, Inc. | 17 | $18,369 |
| Henry Schein, Inc. | 5 | $8,520 |
| J. Morita USA, Inc. | 2 | $7,615 |
| Dentsply Sirona Inc | 1 | $1,333 |
| Nobel Biocare USA | 21 | $1,136 |
| Straumann USA LLC | 27 | $901 |
| Salvin Dental Specialties, Inc. | 4 | $391 |
| Biolase, Inc. | 3 | $333 |
| Keystone Dental Inc. | 3 | $174 |
| Zimmer Biomet | 2 | $129 |
| VOCO America Inc. | 1 | $21 |
| Dentsply IH Inc. | 1 | $15 |
| Southern Anesthesia & Surgical, Inc (dba ACE Southern) | 1 | $13 |
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.
- Bio-Gide$12,620
- Bio-Oss$5,000
- OSSIX PLUS$1,333
- Waterlase iPlus, Epic, iLase$328
- NOBELACTIVE$237
- Bio-Materials$134
- Navigator System$125
- NOBELPARALLEL$120
- NOBELSPEEDY$120
- NOBELREPLACE$120
- NOBELPROCERA$120
How this compares
$38,952 in reported general payments places this provider in the 95th percentile of 716 periodontics providers in California.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Amoxicillin | 198 | $902 |
| Diflunisal | 34 | $513 |
| Ibuprofen | 160 | $497 |
| Doxycycline Hyclate | 18 | $184 |
| Azithromycin | 42 | $159 |
Paid to pharmacies, not to this prescriber.
Other periodontics in Fullerton
- Nelson YenFullerton$21K
- Eric ChoFullerton$8K
- Aleksander JovanovicLos Angeles$1.5M
- Chanook AhnLos Angeles$310K
- Neema BakTarzana$264K
- Pilseong KimIrvine$210K
- Stephen JohnSan Carlos$191K
- Oded BahatBeverly Hills$119K
- Jeremy UenoCampbell$89K
- Ehsan RezvanGilroy$56K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.