Active NPI 1144205568 Individual Practitioner Male Practitioner

Dr. James Whittenburg Walker , MD

Internal Medicine • Amarillo, TX

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. James Walker, MD is a certified Internal Medicine practicing in Amarillo, TX. With approximately 36 years of clinical experience since graduating from University Of Texas Southwestern Medical School At Dallas in 1990, Dr. Walker delivers high-quality medical care to the local community at 1400 S COULTER ST.

Dr. Walker is affiliated with Texas Tech University Health Sciences Center Amarillo and accepts Medicare assignment.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, established patient outpatient office visit, hospital discharge day management. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

1400 S Coulter St

Amarillo, TX 791061786

Telephone 8064149100

Fax 8063545717

Associated Practice Facility / Clinic

🏢 Texas Tech University Health Sciences Center Amarillo Facility NPI 1386675940

Medicare Profile & Education

Medical School

University Of Texas Southwestern Medical School At Dallas

Graduation Year

1990

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Amarillo, TX

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

36 Yrs +12.4 yrs vs City Avg

City Avg: 23.6 Yrs

State Avg: 26.2 Yrs

Regional Practice Density

88 Specialists

Practicing in Amarillo, TX (9538 Statewide)

Telehealth Adoption Rate

18.2% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

66.9% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Walker (36 Years) 36 Yrs

Amarillo Specialty Average (23.6 Years) 23.6 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	115	55	$389.00	$80.13
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	111	69	$185.21	$128.04
99213 Established patient office or other outpatient visit, typically 15 minutes	60	51	$176.60	$91.71
99238 Hospital discharge day management, 30 minutes or less	46	46	$388.00	$82.23
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	38	19	$559.00	$119.74
99231 Follow-up hospital inpatient care per day, typically 15 minutes	22	15	$215.00	$50.34
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	20	20	$315.05	$132.90
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	12	12	$376.00	$175.95

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	242	87	$389.00	$76.37
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	171	94	$178.00	$122.65
99238 Hospital discharge day management, 30 minutes or less	60	59	$388.00	$77.35
99213 Established patient office or other outpatient visit, typically 15 minutes	46	43	$143.00	$87.45
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	43	33	$559.00	$113.50

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	162	90	$178.00	$125.09
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	99	49	$559.00	$99.12
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	95	48	$389.00	$69.07
99238 Hospital discharge day management, 30 minutes or less	47	47	$388.00	$69.71
99213 Established patient office or other outpatient visit, typically 15 minutes	47	41	$143.00	$84.34
G0179 Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imp	34	14	$78.00	$39.95
99231 Follow-up hospital inpatient care per day, typically 15 minutes	26	15	$215.00	$37.35
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	11	11	$82.00	$51.66

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	224	94	$389.00	$70.12
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	145	93	$224.18	$125.74
99213 Established patient office or other outpatient visit, typically 15 minutes	99	79	$163.18	$89.39
99231 Follow-up hospital inpatient care per day, typically 15 minutes	50	20	$215.00	$37.65
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	47	26	$559.00	$101.16
99238 Hospital discharge day management, 30 minutes or less	47	46	$388.00	$69.51
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	19	19	$299.00	$132.93
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	11	11	$354.00	$195.94

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	165	104	$178.00	$106.37
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	122	71	$389.00	$71.83
99213 Established patient office or other outpatient visit, typically 15 minutes	66	59	$139.00	$72.07
G0008 Administration of influenza virus vaccine	41	39	$52.00	$16.17
99231 Follow-up hospital inpatient care per day, typically 15 minutes	37	26	$215.00	$39.10
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	35	19	$559.00	$103.38
90662 Influenza vaccine split virus, preservative free	34	32	$65.00	$59.91
G0179 Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imp	23	12	$78.00	$39.96
99238 Hospital discharge day management, 30 minutes or less	23	23	$388.00	$72.25
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	21	21	$312.00	$114.41
99441 Telephone medical discussion with physician, 5-10 minutes	16	14	$112.63	$33.92
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	13	13	$299.00	$136.24
99221 Initial hospital inpatient care per day, typically 30 minutes	11	11	$167.00	$100.87
99442 Telephone medical discussion with physician, 11-20 minutes	11	11	$183.09	$69.85

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	287	152	$179.00	$105.09
99213 Established patient office or other outpatient visit, typically 15 minutes	170	129	$139.00	$71.87
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	119	65	$389.00	$71.17
99231 Follow-up hospital inpatient care per day, typically 15 minutes	42	28	$215.00	$38.52
G0179 Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imp	34	11	$78.00	$39.67
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	30	18	$559.00	$101.77
G0008 Administration of influenza virus vaccine	28	28	$52.00	$15.90
99238 Hospital discharge day management, 30 minutes or less	27	27	$388.00	$71.32
99406 Smoking and tobacco use intermediate counseling, greater than 3 minutes up to 10 minutes	26	19	$21.00	$14.45
90662 Influenza vaccine split virus, preservative free	21	21	$65.00	$54.89
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	15	15	$299.00	$133.89
99221 Initial hospital inpatient care per day, typically 30 minutes	15	15	$167.00	$99.01
71046 X-ray of chest, 2 views	14	14	$102.36	$20.13
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	12	12	$82.00	$51.43
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$322.00	$159.64

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	295	136	$178.00	$103.43
99213 Established patient office or other outpatient visit, typically 15 minutes	130	103	$139.00	$70.01
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	117	61	$389.00	$71.00
99231 Follow-up hospital inpatient care per day, typically 15 minutes	45	32	$215.00	$38.25
99406 Smoking and tobacco use intermediate counseling, greater than 3 minutes up to 10 minutes	41	27	$21.00	$13.99
G0179 Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imp	37	16	$78.00	$40.07
G0008 Administration of influenza virus vaccine	37	37	$52.00	$19.51
90662 Influenza vaccine split virus, preservative free	30	30	$43.00	$42.14
99238 Hospital discharge day management, 30 minutes or less	29	29	$388.00	$70.02
93793 Anticoagulant management of patient taking warfarin	21	11	$37.00	$11.68
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	19	18	$299.00	$133.26
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	16	16	$312.00	$112.32
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	15	15	$322.00	$159.43
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	13	13	$82.00	$51.73

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	235	115	$178.00	$100.68
99490 Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month	71	14	$72.00	$39.76
G0179 Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imp	58	14	$78.00	$38.80
99213 Established patient office or other outpatient visit, typically 15 minutes	46	44	$139.00	$69.16
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	30	16	$35.00	$18.91
85610 Blood test, clotting time	22	12	$17.00	$5.28
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	21	13	$389.00	$68.91
99406 Smoking and tobacco use intermediate counseling, greater than 3 minutes up to 10 minutes	16	11	$21.00	$13.64
G0008 Administration of influenza virus vaccine	14	14	$52.00	$23.91
90662 Influenza vaccine split virus, preservative free	11	11	$43.00	$42.07

Medical Specialties & State Licenses

CMS Verified: 2025-06-02

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License TX H9584

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.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

200347260 A (OK)

Medicaid State Provider ID

P089K7726 (TX)

Medicaid State Provider ID

132290108 (TX)

Medicaid State Provider ID

132290109 (TX)

Medicaid State Provider ID

64971589 (NM)

Hospital & Practice Group Affiliations

Texas Tech University Health Sciences Center Amarillo

1400 S Coulter St, Amarillo, TX 791061786

Phone: 8064149608

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

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Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events

✅

NPI Profile Active September 22, 2016

NPI status registered as active in NPPES database

📍

Updated Practice Location September 22, 2016

Registered at 1400 S COULTER ST, AMARILLO, TX 791061786 (Tel: 8064149100)

📍

Updated Business Mailing Address September 22, 2016

Registered at 1400 WALLACE BLVD, AMARILLO, TX 791061708 (Tel: 8064149100)

👤

Provider Name / Credentials Updated September 22, 2016

Recorded as JAMES WALKER, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) September 22, 2016

Internal Medicine (License #H9584 in TX)

🟢

Initial NPI Registration & Enumeration December 08, 2005

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1144205568

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: December 08, 2005

Last Update: June 02, 2025

Sole Proprietor: No

Update or Correct Profile

Mailing Address

1400 Wallace Blvd

Amarillo, TX 791061708

Phone: 8064149100

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.