Mark Johnston Williams, MD - Medicare Anesthesiology in Longview, TX

Mark Johnston Williams, MD is a medicare enrolled "Anesthesiology" physician in Longview, Texas. He graduated from medical school in 1986 and has 38 years of diverse experience with area of expertise as Anesthesiology. He is a member of the group practice Northstar Anesthesia Iii Pa and his current practice location is 2901 N. 4th St., Longview, Texas. You can reach out to his office (for appointments etc.) via phone at (903) 247-2050.

Mark Johnston Williams is licensed to practice in Texas (license number H3845) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1174590947.

Contact Information

Mark Johnston Williams, MD
2901 N. 4th St.,
Longview, TX 75605-5128
(903) 247-2050
(903) 934-8280



Physician's Profile

Full NameMark Johnston Williams
GenderMale
SpecialityAnesthesiology
Experience38 Years
Location2901 N. 4th St., Longview, Texas
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Mark Johnston Williams graduated from medical school in 1986
  NPI Data:
  • NPI Number: 1174590947
  • Provider Enumeration Date: 03/01/2006
  • Last Update Date: 01/31/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 7517931207
  • Enrollment ID: I20050805000755

Medical Identifiers

Medical identifiers for Mark Johnston Williams such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1174590947NPI-NPPES
138869601MedicaidTX

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207L00000XAnesthesiology H3845 (Texas)Primary
207LP2900XAnesthesiology - Pain Medicine H3845 (Texas)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Longview Regional Medical CenterLongview, TXHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Northstar Anesthesia Iii Pa0042630501335

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Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Mark Johnston Williams allows following entities to bill medicare on his behalf.
Entity NameHorizon Anesthesia Associates
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1811982481
PECOS PAC ID: 5294725701
Enrollment ID: O20040517000478

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Entity NameTexas Ams Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1174926125
PECOS PAC ID: 9133441769
Enrollment ID: O20141209001912

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Entity NameNorthstar Anesthesia Iii Pa
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1356968952
PECOS PAC ID: 0042630501
Enrollment ID: O20201022000080

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Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Mark Johnston Williams is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Mark Johnston Williams, MD
Po Box 614,
Longview, TX 75606-0614

Ph: (903) 247-2050
Mark Johnston Williams, MD
2901 N. 4th St.,
Longview, TX 75605-5128

Ph: (903) 247-2050

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Anesthesiology Doctors in Longview, TX

Sayojirao Venkata Kodali, MD
Anesthesiology
Medicare: Accepting Medicare Assignments
Practice Location: 906 Judson Rd, Longview, TX 75601
Phone: 903-655-1313    Fax: 903-657-6067
Roger Seth Baker, MD
Anesthesiology
Medicare: Accepting Medicare Assignments
Practice Location: 2901 N. 4th St, Longview, TX 75605
Phone: 903-247-2050    Fax: 903-934-8280
Stanley Tunstall, M.D.
Anesthesiology
Medicare: Accepting Medicare Assignments
Practice Location: 2901 N. 4th St, Longview, TX 75605
Phone: 903-247-2050    Fax: 903-934-8280
Allen Ross Morton, M.D.
Anesthesiology
Medicare: Not Enrolled in Medicare
Practice Location: 703 E Marshall Ave, #4002, Longview, TX 75601
Phone: 903-247-2050    Fax: 903-247-2054
Mr. Michael Christopher Roberts, MD
Anesthesiology
Medicare: Accepting Medicare Assignments
Practice Location: 906 Judson Rd, Longview, TX 75601
Phone: 903-655-1313    Fax: 903-657-6067
Lamont Steven Berg, M.D.
Anesthesiology
Medicare: Accepting Medicare Assignments
Practice Location: 703 E Marshall Ave, #4002, Longview, TX 75601
Phone: 903-247-2050    Fax: 903-247-2054

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