DR. JOHN WILLIAMSON M.D.
NPI 1922069186
Pain Medicine - Pain Medicine in Huntsville, TX

Q: What is John Williamson's NPI number?

The NPI number for John Williamson is 1922069186. It was assigned to this individual provider in the NPPES registry on March 29, 2006.

Q: What is John Williamson's specialty?

The primary specialty registered for this NPI is Pain Medicine with taxonomy code 208VP0000X.

Q: When was this NPI record last updated?

The NPPES record for John Williamson was last updated on December 11, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 29, 2006PECOS EnrolledAccepts Medicare Assignment

133 MEDICAL PARK LN STE B, HUNTSVILLE, TX 77340(936) 730-8833(936) 730-8866 Get Directions Write a Review

NPPES record last updated: December 11, 2019. Verified against the NPPES registry weekly; last sync: November 01, 2026.

On this page

About Dr. John Williamson M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JOHN WILLIAMSON M.D. (NPI 1922069186) is an individual pain medicine provider in Huntsville, Texas, licensed in Texas (J2414) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Huntsville Memorial Hospital, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1922069186

Entity TypeIndividualMale

Primary Taxonomy208VP0000X

Provider Legal NameDR. JOHN WILLIAMSONCredential: M.D.

Location Address133 MEDICAL PARK LN STE BHuntsville, TX 77340-4979

Mailing Address4400 Fm 1061Amarillo, TX 79124-4716

Phone(936) 730-8833

Fax(936) 730-8866

Sole ProprietorNo

Medical School CMSOtherGraduated 1991

Enumeration DateMarch 29, 2006

Last NPPES UpdateDecember 11, 2019

✔ NPI 1922069186 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPain Medicine · Pain MedicineAllopathic & Osteopathic Physicians

Taxonomy Code208VP0000X

License✔ Licensed in TX · J2414

Definition

Pain Medicine is a primary medical specialty based on a distinct body of knowledge and a well-defined scope of clinical practice that is founded on science, research and education. It is concerned with the study of pain, the prevention of pain, and the evaluation, treatment, and rehabilitation of persons in pain. A comprehensive evaluation incorporates the physical, psychological, cognitive and socio-cultural contributions to pain. The treatment protocol may include pharmacological, invasive, behavioral, cognitive, rehabilitative and complementary strategies provided in a concurrent focused and patient specific manner. The pain medicine physician often serves the patient as a frontline physician regarding their pain, but also may serve as a consultant to other physicians, direct an interdisciplinary/multidisciplinary treatment team, conduct research, or advocate for the patient's pain care with public and private agencies. The Pain Medicine physician may work in variety of settings including office, clinic, hospital, university, or governmental/public agencies.

133 MEDICAL PARK LN STE B, Huntsville, TX 77340

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Secondary Practice Locations 2

Location 11020 Riverwood Ct Ste 200Conroe, TX 77304-2974 · Phone (936) 756-3444 · Fax (936) 756-3452

Location 21901 Medi Park, Suite 2002Amarillo, TX 79106-2110 · Phone (806) 353-4699 · Fax (806) 353-4551

Other Identifiers 1

Medicaid141581201TX

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. John Williamson M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1254236151

PECOS Enrollment IDI20100218000248

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show John Williamson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Stephen M. Sims, MD, PA

Same address

Pain Medicine

133 MEDICAL PARK LN, STE B
Huntsville, TX 77340

Reassigned Medicare billing, Texas enrollment
4 clinicians in this Medicare group

NPI 1235148172 (936) 730-8833

Conroe Ambulatory Anesthesia PA

29 mi

Anesthesiology

1020 RIVERWOOD CT STE 200
Conroe, TX 77304

Reassigned Medicare billing, Texas enrollment
19 clinicians in this Medicare group

NPI 1457482937 (936) 730-8833

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 29

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml Q9967

Low osmolar contrast material with 300-399 mg/ml iodine concentration is a diagnostic tool used in imaging procedures. It helps to enhance the visibility of specific areas in the body, aiding in accurate diagnosis. It's safe and generally well-tolerated by patients.

7,130 services87 patients

Injection, propofol, 10 mg J2704

Propofol is a medication given via injection to help you relax or sleep during surgery or other medical procedures. The 10 mg dosage refers to the amount of medication you'll receive. It's administered by a healthcare professional and monitored closely for safety.

2,330 services90 patients

Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301

Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.

492 services70 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

410 services145 patients

Testing for presence of drug, by chemistry analyzers 80307

Chemistry analyzers are used to detect the presence of drugs in your system. This test involves taking a small sample of your blood or urine. The sample is then analyzed for specific substances. The results help in understanding your health condition better.

196 services107 patients

Drug test(s), definitive, utilizing (1) drug identification methods able to identify individual drugs and distinguish between structural isomers (but not necessarily stereoisomers), including, but not limited to gc/ms (any type, single or tandem) and lc/ms G0482

A definitive drug test identifies specific drugs in your system. Advanced methods like GC/MS (Gas Chromatography/Mass Spectrometry) and LC/MS (Liquid Chromatography/Mass Spectrometry) are used. These can distinguish between similar drugs, providing precise results.

196 services107 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

140 services88 patients

Injection, methylprednisolone acetate, 40 mg J1030

Methylprednisolone acetate is a medication given through an injection. It's a type of corticosteroid, which reduces inflammation and immune responses. It can be used to treat various conditions like arthritis, allergies, and skin diseases. This dose is 40 mg.

95 services38 patients

Injection, midazolam hydrochloride, per 1 mg J2250

Midazolam hydrochloride is a medication injected to help you relax or sleep before surgery or certain medical procedures. It works by calming the brain and nerves. It's given in small doses, measured in milligrams (mg).

65 services25 patients

Injection of anesthetic and/or steroid drug into sacral spine nerve root using imaging guidance, single level 64483

This procedure involves injecting a mix of numbing and anti-inflammatory medication into a specific nerve root in the lower back. It helps manage pain and reduce inflammation. The process is guided by imaging technology for precision.

55 services41 patients

Aspiration and/or injection of fluid large joint using ultrasound guidance 20611

This procedure involves using ultrasound technology to accurately locate a large joint, usually the knee or shoulder. A needle is then inserted to either extract fluid (aspiration) or inject medication. The ultrasound helps ensure precision and safety.

54 services29 patients

Injection of anesthetic or steroid into joint between lower spine and hip bone using imaging guidance 27096

This procedure involves injecting medicine into the joint where your lower spine meets your hip bone. Using special imaging technology, the doctor ensures the medicine is delivered accurately. This can help reduce pain and inflammation in that area.

50 services33 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

46 services46 patients

Injection of trigger points, 3 or more muscles 20553

Trigger point injection therapy involves injecting medication into specific areas of your muscles, known as trigger points. These are areas that produce pain and discomfort. If you have three or more muscles affected, each will be treated individually.

41 services29 patients

Alcohol and/or substance (other than tobacco) misuse structured assessment (e.g., audit, dast), and brief intervention, 5-14 minutes G2011

This service involves a structured assessment, such as AUDIT or DAST, to identify potential misuse of alcohol or substances. If misuse is detected, a brief intervention lasting 5-14 minutes is conducted to provide guidance and support to help manage the issue.

37 services36 patients

Injection of anesthetic and/or steroid drug into sacral spine nerve root using imaging guidance, each additional level 64484

This procedure involves injecting an anesthetic or steroid drug into the sacral spine nerve root. It's done under imaging guidance to ensure accuracy. The process can be repeated for each additional level of the spine to help manage pain or inflammation.

34 services26 patients

Injection of upper or middle spine facet joint using imaging guidance, single level 64490

This procedure involves injecting medication into a joint in your upper or middle spine. It's performed under imaging guidance for precision. The aim is to reduce inflammation and pain. It's a single-level process, meaning one joint is treated at a time.

33 services19 patients

Injection of upper or middle spine facet joint using imaging guidance, second level 64491

This procedure involves injecting medication into the upper or middle spine facet joint, a small joint in your back. This is done under imaging guidance for precision. It's a second-level procedure, meaning it's done on two separate joints. It can help reduce pain and inflammation.

32 services18 patients

Injection of lower or sacral spine facet joint using imaging guidance, second level 64494

This procedure involves injecting medication into the facet joints of your lower or sacral spine to manage pain. Imaging guidance ensures accurate placement. It's the second level, meaning it's done on two different joint levels.

24 services17 patients

Injection of lower or sacral spine facet joint using imaging guidance, single level 64493

This procedure involves injecting medication into the facet joint in your lower back or sacral spine. It's done under imaging guidance to ensure accuracy. The aim is to alleviate pain and inflammation. It's a safe, often effective method for managing spinal discomfort.

23 services16 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

20 services14 patients

Fluoroscopic guidance for needle placement 77002

Fluoroscopic guidance for needle placement is a medical procedure that uses a special X-ray technology to help accurately place a needle in the body. It's often used in biopsies, injections or other treatments to ensure precision and safety.

19 services12 patients

Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit G0438

An annual wellness visit is a yearly appointment with your doctor to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's an opportunity to discuss your health status and goals and get a plan tailored for you.

18 services18 patients

Destruction of lower or sacral spinal facet joint nerves using imaging guidance, single facet joint 64635

This procedure involves using imaging guidance to accurately target and destroy nerves in the lower or sacral spinal facet joint. It's done to relieve chronic back pain. The process is safe and usually effective.

15 services14 patients

Destruction of lower or sacral spinal facet joint nerves using imaging guidance, each additional facet joint 64636

This procedure involves using imaging technology to locate and treat nerves in your lower spine or sacral area that may be causing pain. Each additional facet joint refers to treating more than one spinal nerve. It's a non-invasive way to manage chronic back pain.

15 services14 patients

Injection of substance into lower spine canal using imaging guidance 62323

This procedure involves injecting a substance into your lower spine canal, guided by real-time images. It's done to diagnose or treat various conditions. You may feel slight discomfort, but it's generally safe and can provide valuable information for your treatment plan.

14 services12 patients

Injection of substance into middle or upper spine canal using imaging guidance 62321

This procedure involves injecting a substance into your middle or upper spine canal. It's performed under imaging guidance to ensure accuracy. The substance can help diagnose or treat various conditions, providing relief from symptoms.

13 services11 patients

Destruction of upper or middle spinal facet joint nerves using imaging guidance, single facet joint 64633

This procedure involves the use of imaging technology to guide a needle to the nerves of a single facet joint in the upper or middle spine. The nerves are then treated to alleviate pain and improve mobility.

12 services11 patients

Destruction of upper or middle spinal facet joint nerves using imaging guidance, each additional facet joint 64634

This procedure involves the use of imaging technology to accurately target and destroy nerves in the upper or middle spinal facet joints, which may be causing pain. Each additional facet joint treated follows the same process.

12 services11 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Huntsville Memorial Hospital

Acute Care Hospitals · Huntsville, TX

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number450347

Location110 Memorial Hospital DriveHuntsville, TX 77340 · Walker County

Emergency services Birthing friendly

Chi St Lukes Health Memorial Livingston

Acute Care Hospitals · Livingston, TX

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number450395

Location1717 Hwy 59 BypassLivingston, TX 77351 · Polk County

Emergency services Birthing friendly

Aspire Hospital

Acute Care Hospitals · Conroe, TX

OwnershipPhysician

CMS Certification Number670093

Location2006 South Loop 336 West, Suite 500Conroe, TX 77304 · Montgomery County

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77340 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$126.40 typical visit price

range $54.84 – $166.88

Typical copayment $31.60 (range $13.71 – $41.72)

Most-billed visit code 99204

Established Patient

$97.05 typical visit price

range $17.52 – $136.11

Typical copayment $24.26 (range $4.38 – $34.02)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Breast Cancer Screening

Percentage of women 50-74 years of age who had a mammogram to screen for breast cancer

36%185 patients2/55-star benchmark: 92%

Documentation of Current Medications in the Medical Record

Percentage of visits for patients aged 18 years and older for which the eligible professional or eligible clinician attests to documenting a list of current medications using all immediate resources available on the date of the encounter.

98%591 patients4/55-star benchmark: 100%

e-Prescribing

At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.

99%1,206 patients5/55-star benchmark: 99%

Patient-Specific Education

The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.

93%614 patients4/55-star benchmark: 97%

Pneumococcal Vaccination Status for Older Adults

Percentage of patients 65 years of age and older who have ever received a pneumococcal vaccine

44%313 patients2/55-star benchmark: 90%

Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan

Percentage of patients aged 18 years and older with a BMI documented during the current encounter or during the previous twelve months AND with a BMI outside of normal parameters, a follow-up plan is documented during the encounter or during the previous…

75%567 patients4/55-star benchmark: 97%

Preventive Care and Screening: Influenza Immunization

Percentage of patients aged 6 months and older seen for a visit between October 1 and March 31 who received an influenza immunization OR who reported previous receipt of an influenza immunization

14%320 patients1/55-star benchmark: 88%

Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention

Percentage of patients aged 18 years and older who were screened for tobacco use one or more times within 24 months AND who received tobacco cessation intervention if identified as a tobacco user

Patients screenedForUse: 1% · 158 patients

Patients tobacco: 65% · 438 patients

98%438 patients5/55-star benchmark: 98%

Provide Patient Access

At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…

84%614 patients4/55-star benchmark: 100%

View, Download, or Transmit (VDT)

At least one patient seen by the MIPS eligible clinician during the performance period (or patient-authorized representative) views, downloads or transmits their health information to a third party during the performance period.

2%614 patients

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

STEPHEN MICHAEL SIMS MD

Pain Medicine (Pain Medicine)

133 MEDICAL PARK LN STE B
HUNTSVILLE, TX 77340

Walker County (936) 730-8833

ANISA FARUK GOPALANI M.D.

Pain Medicine (Pain Medicine)

133 MEDICAL PARK LN STE B
HUNTSVILLE, TX 77340

Walker County (936) 730-8833

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Williamson's NPI number?

The NPI number for John Williamson is 1922069186. It was assigned to this individual provider in the NPPES registry on March 29, 2006.

Where is John Williamson located?

John Williamson practices at 133 Medical Park Ln Ste B, Huntsville, TX 77340. The listed phone number is (936) 730-8833.

What is John Williamson's specialty?

The primary specialty registered for this NPI is Pain Medicine with taxonomy code 208VP0000X.

Is John Williamson enrolled in Medicare?

Yes. John Williamson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for John Williamson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Williamson reassigns Medicare benefits to 2 organizations: Stephen M. Sims, MD, PA (Huntsville, TX) and Conroe Ambulatory Anesthesia PA (Conroe, TX). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does John Williamson accept?

Health plans from UnitedHealthcare list John Williamson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is John Williamson affiliated with any hospitals?

According to CMS data, John Williamson is affiliated with Huntsville Memorial Hospital, Chi St Lukes Health Memorial Livingston and Aspire Hospital.

When was this NPI record last updated?

The NPPES record for John Williamson was last updated on December 11, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.