Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mark David Koone, MD

Individual provider Dermatology Physician · NPI 1720055833

Mark David Koone, MD is a Dermatology in Sherman, Texas. Graduated from Baylor College of Medicine in 1982, 44 years ago. Practices with Pdp of Texas, PLLC, a 60-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
44
Trained at
Baylor College of Medicine
Licensed in
TX
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

230 E Sycamore St Ste 305
Sherman, TX 75090-5013
Phone: (903) 771-4613
Fax: (903) 698-6376
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Dermatology Physician (primary) Taxonomy 207N00000X · Licence H1976 (TX)

Record details

NPI number1720055833
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 7, 2006
Last updated in NPPESJuly 29, 2025
Certification dateJuly 29, 2025
Mailing address9900 N Central Expy Ste 500, Dallas, TX 75231-0928

Medicare enrollment

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

Medicare specialtyDERMATOLOGY
Medical schoolBAYLOR COLLEGE OF MEDICINE
Graduated 1982 (44 years in practice)
Group practice Pdp Of Texas, Pllc — 60 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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