Physician Profile
Unclaimed ProfileAbout WILLIAMS
Based in Longview, TX, Mark Johnston Williams, M.D. is listed in the NPI registry under anesthesiology. Mark is also listed as specialising in anesthesiology — pain medicine.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What kind of doctor is Dr. Williams?
Dr. Williams is an anesthesiology in Longview, TX. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “ANESTHESIOLOGY”.
NPI registry
What is Dr. Williams's address?
Dr. Williams is listed at 2901 N. 4TH ST., Longview, TX 75605. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Williams?
The number on file is (903) 247-2050. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Williams?
Dr. Williams's National Provider Identifier is 1174590947. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Williams train?
Dr. Williams attended Other, graduating in 1986. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Williams have?
Dr. Williams has 40 years experience. Calculated from a graduation year of 1986, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Williams perform?
According to Medicare billing data, Dr. Williams provides treatments such as anesthesia for x-ray on artery of brain, heart, or chest and anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Williams's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Williams. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (903) 247-2050
- Email not available
Practice Locations
2901 N. 4TH ST.
Longview, TX 75605
Procedures Most Often Billed to Medicare
137 services · 137 patients · 10 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Anesthesia for x-ray on artery of brain, heart, or chest | Anaesthesia | 01926 |
19 |
| Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope | Anaesthesia | 00731 |
17 |
| Anesthesia for other procedure on skin of arms, legs, and front body | Anaesthesia | 00400 |
16 |
| Anesthesia for other procedure on urinary system through urethra | Anaesthesia | 00910 |
15 |
| Anesthesia for exam of colon using an endoscope | Anaesthesia | 00812 |
13 |
| Anesthesia for procedure for total knee joint replacement | Anaesthesia | 01402 |
12 |
| Anesthesia for other procedure on large bowel using an endoscope | Anaesthesia | 00811 |
12 |
| Anesthesia for other procedure on upper abdomen | Anaesthesia | 00790 |
11 |
| Anesthesia for procedure to assess heart electrical activity | Anaesthesia | 00537 |
11 |
| Anesthesia for lens surgery | Anaesthesia | 00142 |
11 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Is this your profile?
Verify your identity to control how patients — and AI assistants — describe you.
Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other anesthesiology specialists at this location 4
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 5
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 29 related providers in 4 groups
Other anesthesiology specialists in Longview 6
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1986 at Other 7
Providers who graduated from the same medical school in the same year.
Also performs Anesthesia for x-ray on artery of brain, heart, or chest 8
Providers in TX who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.