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

Mark Johnston Williams, MD

Individual provider Anesthesiology Physician · NPI 1174590947

Mark Johnston Williams, MD practises Anesthesiology in Longview, Texas. Qualified in 1986, 40 years ago. Practices with Northstar Anesthesia III PA, a 399-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
40
Licensed in
TX
In the registry since
2006
Specialties on file
2
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

2901 N 4th St
Longview, TX 75605-5128
Phone: (903) 247-2050
Fax: (903) 934-8280
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence H3845 (TX)
Pain Medicine (Anesthesiology) Physician Taxonomy 207LP2900X · Licence H3845 (TX)

Record details

NPI number1174590947
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 1, 2006
Last updated in NPPESJanuary 31, 2023
Certification dateJanuary 31, 2023

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Also practisesPAIN MANAGEMENT
Medical schoolOTHER
Graduated 1986 (40 years in practice)
Group practice Northstar Anesthesia Iii Pa — 399 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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 patients318
Services billed 347 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Northstar Anesthesia III PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 399 clinicians in the practice; 12 are shown here.

Other providers in Longview