Donald S. Clem III, DDS
- Part D claims, 2024
- 528
- Industry payments
- $201
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 220 Laguna Rd, Fullerton, CA 92835-2523
- Practice phone
- Call (714) 441-0436
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Nelson T. Yen Dds, Ms
Dental practice · Fullerton, California
Find Donald Clem's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Donald S. Clem III is a periodontist in Fullerton, California
Donald Clem practices at Nelson T. Yen Dds, Ms in Fullerton, California.
Donald Clem's NPI, 1770673287, was assigned on October 13, 2006. Donald Clem holds California license 29240.
- NPI
- 1770673287NPI Registry (opens in a new tab)
- NPI enumeration date
- October 13, 2006
- NPI status
- Active
- Practice phone
- (714) 441-0436
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Donald S. Clem III practices at Nelson T. Yen Dds, Ms in Fullerton, California
Donald Clem's primary practice is Nelson T. Yen Dds, Ms, at 220 Laguna Rd, Fullerton, CA 92835-2523. The practice phone is (714) 441-0436.
- Nelson T. Yen Dds, Ms220 Laguna Rd, Fullerton, CA 92835-2523Phone(714) 441-0436
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Donald S. Clem III is affiliated with 1 site of care and 1 medical group
Donald Clem's primary practice is Nelson T. Yen Dds, Ms in Fullerton, California. Dmand AI also links Donald Clem to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Donald S. Clem III's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Donald Clem practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Nelson T. Yen Dds, Ms | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Donald S. Clem III is one of 371 periodontists in California
Periodontics is Donald Clem's primary specialty in the NPI Registry, under taxonomy code 1223P0300X. Donald Clem is licensed in California.
Specialties and state licenses
- Periodontist, CaliforniaPrimary
Periodontists near Donald Clem
Counts of periodontists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Donald S. Clem III's patients have a median age of 72
Across all payers, Dmand AI patient panel data puts Donald Clem's median patient age at 72, with 100% women.
Donald Clem's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Donald S. Clem III wrote 528 Medicare Part D claims in 2024
In 2024, Donald Clem wrote 528 Medicare Part D claims for 228 patients. 99% of them were for generic drugs.
Donald Clem's Part D claims by kind of drug, 2024
- Generic525 claims99%
- Brand-name and other3 claims1%
Drug classes CMS tracks in Donald Clem's Part D claims, 2024
- Opioids2%12 of 528 claims
- Antibiotics55%291 of 528 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Donald S. Clem III received $201 in industry payments in 2025
CMS Open Payments shows 6 general payments to Donald Clem from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Straumann USA LLC paid the most, $104. It also lists 1 research payment totaling $35,000 in 2025.
Companies that paid Donald Clem the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Donald S. Clem III's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Donald S. Clem III
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Donald S. Clem III's NPI number?
Donald S. Clem III's NPI number is 1770673287. It was assigned on October 13, 2006, and it is active in the NPI Registry.
What does Donald S. Clem III specialize in?
Donald S. Clem III is a periodontist in Fullerton, California. The primary specialty in the NPI Registry is Periodontist (taxonomy code 1223P0300X).
Where does Donald S. Clem III practice?
Donald Clem practices at 220 Laguna Rd, Fullerton, CA 92835-2523. Donald Clem's primary practice is Nelson T. Yen Dds, Ms in Fullerton, California. Dmand AI also links Donald Clem to 1 medical group.
What is Donald S. Clem III's office phone number?
The practice phone on file for Donald Clem is (714) 441-0436.
What is Donald S. Clem III's medical license number?
Donald Clem holds California license 29240.
Has Donald S. Clem III received payments from drug or device companies?
CMS Open Payments shows $201 in general payments to Donald Clem from 2 companies from 2025 to 2025. The largest total came from Straumann USA LLC.
How long has Donald S. Clem III been practicing?
Donald Clem's NPI was assigned in 2006.
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