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

Dr. Mark S Wallis, MD

Individual provider Dermatology Physician · NPI 1861489049

Dr. Mark S Wallis, MD practises Dermatology in Longview, Texas. Graduated from University of Texas Medical School at San Antonio in 1988, 38 years ago. Practices with Wallis Dermatology Associates PLLC, an 11-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
38
Trained at
University of Texas Medical School at San Antonio
Licensed in
TX
In the registry since
2005
Specialties on file
6
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

3535 N Fourth St Ste 400
Longview, TX 75605-0038
Phone: (903) 757-3881
Fax: (903) 757-5948
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

MOHS-Micrographic Surgery Physician (primary) Taxonomy 207ND0101X · Licence H6685 (TX)
Dermatology Physician Taxonomy 207N00000X · Licence H6685 (TX)
Dermatopathology Physician Taxonomy 207ND0900X · Licence H6685 (TX)
Clinical & Laboratory Dermatological Immunology Physician Taxonomy 207NI0002X · Licence H6685 (TX)
Pediatric Dermatology Physician Taxonomy 207NP0225X · Licence H6685 (TX)
Procedural Dermatology Physician Taxonomy 207NS0135X · Licence H6685 (TX)

Record details

NPI number1861489049
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 3, 2005
Last updated in NPPESMarch 7, 2023
Certification dateJuly 21, 2021

Medicare enrollment

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

Medicare specialtyDERMATOLOGY
Medical schoolUNIVERSITY OF TEXAS MEDICAL SCHOOL AT SAN ANTONIO
Graduated 1988 (38 years in practice)
Group practice Wallis Dermatology Associates Pllc — 11 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Melanoma (skin cancer) excision 118 times · 94th percentile
Removal of skin lesions 666 times · 89th percentile
Removal or shaving of skin growth 115 times · 86th percentile
Skin biopsy 127 times · 79th percentile
Removal of skin cancer 462 times · 58th percentile
Removal of nail tissue 1–10 times
Removal of tissue 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients1,676
Services billed 12,459 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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 $2,680 139 payments · a meal or drink at a meeting or visit, not a fee
Education $110 2 payments · educational material or training, 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.

Colleagues at Wallis Dermatology Associates PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Longview