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JAMES WHITTENBURG WALKER JR. MD
NPI 1144205568
Internal Medicine in Amarillo, TX

Active since December 08, 2005PECOS EnrolledAccepts Medicare Assignment
100/100
CMS Quality Rating
1400 S COULTER ST, AMARILLO, TX 79106(806) 414-9100(806) 354-5717 Get Directions Write a Review

NPPES record last updated: June 2, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jun 2, 2025, Sep 22, 2016 (2 updates tracked since 2016).

About James Whittenburg Walker Jr. Md NPPES

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

JAMES WHITTENBURG WALKER JR. MD (NPI 1144205568) is an individual internal medicine provider in Amarillo, Texas, licensed in Texas (H9584) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with Northwest Texas Hospital, and is a graduate of University Of Texas Southwestern Medical School At Dallas (1990).

NPPES Registry Identity

NPI1144205568
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameJAMES WHITTENBURG WALKER JR.Credential: MD
Location Address1400 S COULTER STAmarillo, TX 79106-1786
Mailing Address1400 Wallace BlvdAmarillo, TX 79106-1708 · (806) 414-9100 · Fax (806) 354-5717
Phone(806) 414-9100
Fax(806) 354-5717
Sole ProprietorNo
Medical School CMSUniversity Of Texas Southwestern Medical School At DallasGraduated 1990
Enumeration DateDecember 8, 2005
Last NPPES UpdateJune 2, 20252 updates tracked since enumeration
NPPES CertifiedJune 2, 2025
✔ NPI 1144205568 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in TX · H9584
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
1400 S COULTER ST, Amarillo, TX 79106
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Other Identifiers 5

Medicaid200347260 AOK
MedicaidP089K7726TX
Medicaid132290108TX
Medicaid132290109TX
Medicaid64971589NM

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

James Whittenburg Walker Jr. Md 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 ID8224200381
PECOS Enrollment IDI20111013000561
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.

Areas of Expertise CMS Part B claims 8

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
115 services55 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.
111 services69 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.
60 services51 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
46 services46 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
38 services19 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
22 services15 patients

Hospital Affiliations CMS Care Compare 2

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

Northwest Texas Hospital

Acute Care Hospitals · Amarillo, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450209
Location1501 S Coulter StAmarillo, TX 79106 · Potter County
Emergency services Birthing friendly

Bsa Hospital

Acute Care Hospitals · Amarillo, TX
2/5 CMS rating
OwnershipProprietary
CMS Certification Number450231
Location1600 Wallace BlvdAmarillo, TX 79106 · Potter County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 79106 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.

100/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality91.19
Promoting Interoperability100
Improvement Activities40

Referred Medical Equipment & Supplies CMS DME claims 10

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Enteral feeding supply kit; syringe fed, per day, includes but not limited to feeding/flushing syringe, administration set tubing, dressings, tape B4034
Other-Enteral and Parenteral · category OB006N
1 supplier12 claims360 services$3.29 avg. paid by Medicare
Enteral formula, nutritionally complete with intact nutrients, includes proteins, fats, carbohydrates, vitamins and minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4150
Other-Enteral and Parenteral · category OB006N
1 supplier12 claims5,136 services$0.36 avg. paid by Medicare
Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
6 suppliers48 claims48 services$17.79 avg. paid by Medicare
Home ventilator, any type, used with invasive interface, (e.g., tracheostomy tube) E0465
DME-Other DME · category DE005N
1 supplier12 claims12 services$907.03 avg. paid by Medicare
Nebulizer, with compressor E0570
DME-Other DME · category DE000N
1 supplier18 claims18 services$5.39 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
8 suppliers70 claims70 services$95.40 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

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

MRS. TIFFANY SHEA THOMPSON RNC, NNP-BC
Nurse Practitioner (Neonatal, Critical Care)
1400 S COULTER ST
AMARILLO, TX 79106
Potter County (806) 414-9180
KHALID ALYAMI
Student in an Organized Health Care Education/Training Program
1400 S COULTER ST, SUITE 5100
AMARILLO, TX 79106
Potter County (806) 414-9559
BRENDA CHESLEY
Nurse Practitioner (Pediatrics)
1400 S COULTER ST
AMARILLO, TX 79106
Potter County (806) 414-9800
TEXAS TECH UNIVERSITY HEALTH SCIENCES CENTER AMARILLO
Family Medicine
1400 S COULTER ST
AMARILLO, TX 79106
Potter County (806) 414-9559
DAVID EGERTON PHD
Psychologist (Family)
1400 S COULTER ST
AMARILLO, TX 79106
Potter County (806) 351-3777
TERESA BAKER MD
Obstetrics & Gynecology
1400 S COULTER ST
AMARILLO, TX 79106
Potter County (806) 414-9650
TEXAS TECH UNIVERSITY HEALTH SCIENCES CENTER AMARILLO
Surgery
1400 S COULTER ST
AMARILLO, TX 79106
Potter County (806) 414-9558
JOHN SCOTT MILTON MD
Internal Medicine (Infectious Disease)
1400 S COULTER ST
AMARILLO, TX 79106
Potter County (806) 354-5480

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 James Walker's NPI number?

The NPI number for James Walker is 1144205568. It was assigned to this individual provider in the NPPES registry on December 8, 2005.

Where is James Walker located?

James Walker practices at 1400 S Coulter St, Amarillo, TX 79106. The listed phone number is (806) 414-9100.

What is James Walker's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is James Walker enrolled in Medicare?

Yes. James Walker 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.

What insurance does James Walker accept?

Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 2 other insurers list James Walker 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 James Walker affiliated with any hospitals?

According to CMS data, James Walker is affiliated with Northwest Texas Hospital and Bsa Hospital.

When was this NPI record last updated?

The NPPES record for James Walker was last updated on June 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months 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.