Mark Sampson Winslow, DDS
Dentist · Porterville, CA
Mark Sampson Winslow, DDS is a dentist with a practice address in Porterville, California, and NPI 1144621236, issued on Sep 9, 2014. Check the license (California 63899, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark Sampson Winslow
- Credential
- DDS
- Primary taxonomy
- Dentist 122300000X
- License number
- 63899 CA
Self-reported in NPPES; status is on the state search - Practice location
- 365 Pearson Dr, Porterville, CA 93257
- Phone
- (808) 284-2746
- Enumerated
- Sep 9, 2014
- Record last updated
- Sep 9, 2014 (not updated in 12 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest dentist records → All 14,729 in California → Look up another NPI →
Also registered at 365 Pearson Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Sampson Winslow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 63899Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
63% fewer Medicare Part D claims than the average dentist in 2024
32 Medicare Part D claims for 23 beneficiaries, against an average of 86 among the 51,021 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Mark Sampson Winslow among 14,729 dentist records in California
Mark Sampson Winslow, DDS is one of 14,729 dentist records with a practice address in California. 56% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 63% of them.
- NPI issued2014 · 63% of these records are older, 33% newer
- In a Medicare fileYes · 56% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2014 · 73% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 122300000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
28 dentist records list a practice address in Porterville
They are 28 of the 795 NPPES records with a practice address in Porterville, and 14,729 dentist records in California.
All 14,729 in California → Every provider in Porterville → Dentist nationwide →
The 8 dentist records with the nearest ZIP codes
- Koren Borland, DDSPorterville, CA 932571255383352
- Mohamed Gouda, D.D.S.Porterville, CA 932571073662458
- Rene Herrera, DDSPorterville, CA 932571558481721
- David Hor, D.O.Porterville, CA 932571043384100
- Eric Joo, DDSPorterville, CA 932571386922979
- Enoth Kim, DMDPorterville, CA 932571518117324
- Amirali Mirenayat, DDSPorterville, CA 932571326313057
- Melanie Murphy, DDSPorterville, CA 932571922053032
Common questions
What is Mark Sampson Winslow, DDS's NPI number?
Mark Sampson Winslow, DDS's National Provider Identifier (NPI) is 1144621236, issued on Sep 9, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Mark Sampson Winslow, DDS located?
The NPPES record lists a practice address at 365 Pearson Dr, Porterville, CA, 93257. Phone: (808) 284-2746. Providers update this record themselves, so call before visiting.
How can I verify Mark Sampson Winslow, DDS's license?
NPPES lists California license number 63899, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mark Sampson Winslow, DDS prescribe under Medicare Part D?
In 2024, Mark Sampson Winslow, DDS had 32 Medicare Part D claims for 23 beneficiaries; the average among dentist prescribers was 86. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.