Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mark Thomas Ash, DDS

Individual provider Oral and Maxillofacial Surgery (Dentist) · NPI 1164045738

Mark Thomas Ash, DDS practises Oral Surgery in Duluth, Minnesota. Graduated from University of Michigan School of Dentistry in 2020, 6 years ago. Practices with Northern Oral and Maxillofacial Surgeons PA, a 7-clinician group and works from 4 locations. Licensed in Minnesota and Wisconsin.

Years since qualifying
6
Trained at
University of Michigan School of Dentistry
Licensed in
MN, WI
In the registry since
2020
Specialties on file
2
What do these letters mean?
DDS — Doctor of Dental Surgery
A dentist. DDS and DMD are the same qualification — universities choose which title to award.

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Practice location Address checks out

3617 W Arrowhead Rd
Duluth, MN 55811-4132
Phone: (218) 722-8377
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 3899 Highway 73 Ste 5-6, Hibbing, MN 55746-8348 — (218) 293-0691
  • 515 Delaware St Se, Minneapolis, MN 55455-0357 — (612) 301-2233
  • 503 Belknap St, Superior, WI 54880-2932 — (715) 564-4081

Specialties & licences

Oral and Maxillofacial Surgery (Dentist) (primary) Taxonomy 1223S0112X · Licence D14360 (MN)
Oral and Maxillofacial Surgery (Dentist) Taxonomy 1223S0112X · Licence 6001917-15 (WI)

Record details

NPI number1164045738
Entity typeIndividual (Type 1)
GenderMale
Credentials DDS
Sole proprietorYes
NPI enumeratedMay 18, 2020
Last updated in NPPESAugust 22, 2025
Certification dateAugust 22, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORAL SURGERY
Medical schoolUNIVERSITY OF MICHIGAN SCHOOL OF DENTISTRY
Graduated 2020 (6 years in practice)
Group practice Northern Oral And Maxillofacial Surgeons Pa — 7 clinicians
Accepts Medicare assignment Not indicated
Practice locations2 on file with Medicare

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $343 5 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Northern Oral and Maxillofacial Surgeons PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 7 clinicians in the practice; 5 are shown here.

Other providers in Duluth