JAMES WHITTENBURG JR. WALKER (MD) – Internal Medicine Physician, NPI 1144205568
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
13,290 INTERNAL MEDICINE in TX
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Provider Addresses for JAMES WHITTENBURG JR. WALKER (MD)
1400, Wallace Boulevard, Amarillo, Potter County, Texas, 79106, United States
AMARILLO, TX 791061708
Phone: (806) 414-9100
Fax: (806) 354-5717
Type: Mailing
1400, Coulter Street, Amarillo, Potter County, Texas, 79106, United States
AMARILLO, TX 791061786
Phone: (806) 414-9100
Fax: (806) 354-5717
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $172.
Total Amount is formed as General ($172) + Research ($0) + Ownership ($0) = $172.
Last reported payment date: 2024-10-23 • Largest payer in this snapshot: Otsuka America Pharmaceutical, Inc. ($125).
Total Amount
$172
General + Research + Ownership
Payments
3
Total payment records
General Amount
$172
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-23
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Otsuka America Pharmaceutical, Inc. | $125 |
| Medtronic, Inc. | $27 |
| Novo Nordisk Inc | $20 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2011-10-13
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20111013000561 | I | Internal Medicine | TX | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 242 | 87 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 171 | 94 | $0 |
| 99238 | Hospital discharge day management, 30 minutes or less | 60 | 59 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 46 | 43 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 43 | 33 | $0 |
Insurance plans in this area (ZIP 79106)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| O B S T E T R I C S/ G Y N E C O L O G Y | TX | |
| - | TX | |
| - | TX | |
| Nurse Practitioner | TX | |
| Pulmonary Disease, Critical Care (Intensivists) | TX | |
| - | TX | |
| Family Practice | TX | |
| O B S T E T R I C S/ G Y N E C O L O G Y | TX | |
| Family Practice | TX | |
| Nurse Practitioner | KS |
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