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

Dr. Oscar Jack Chastain III, MD

Individual provider Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · NPI 1285635409

Dr. Oscar Jack Chastain III, MD is a Thoracic Surgery in Longview, Texas. Graduated from Baylor College of Medicine in 1980, 46 years ago. Practices with Christus Trinity Clinic, a 1,531-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
46
Trained at
Baylor College of Medicine
Licensed in
TX
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

701 E Marshall Ave Ste 504
Longview, TX 75601-5659
Phone: (903) 315-2777
Fax: (903) 315-2771
Show map & directions

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

Additional practice locations (3)

  • 703 E Marshall Ave Ste 5008, Longview, TX 75601-5557 — (903) 315-4880
  • 707 E Marshall Ave, Longview, TX 75601-5545 — (903) 315-4880
  • 705 E Marshall Ave Ste 5001, Longview, TX 75601-5524 — (903) 315-4880

Specialties & licences

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (primary) Taxonomy 208G00000X · Licence F6524 (TX)

Record details

NPI number1285635409
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 10, 2005
Last updated in NPPESDecember 19, 2023
Certification dateDecember 19, 2023

Medicare enrollment

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

Medicare specialtyTHORACIC SURGERY
Also practisesVASCULAR SURGERY
Medical schoolBAYLOR COLLEGE OF MEDICINE
Graduated 1980 (46 years in practice)
Group practice Christus Trinity Clinic — 1531 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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