David Walker, DO
NPI 1639142508 · Internal Medicine Physician · Sheridan, WY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Walker, DO is a Internal Medicine Physician provider in Sheridan, WY (NPI 1639142508).
Provider details
- NPI number
- 1639142508
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 4231 (SD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,035 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 486 | $124 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 270 | $88 |
| Blood Test, Clotting Time85610 | 194 | $4 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 188 | $11 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 185 | $126 |
| Administration of Pneumococcal VaccineG0009 | 113 | $32 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 152 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 701 | 166 |
| Pantoprazole Sodium | 427 | 126 |
| Amlodipine Besylate | 358 | 106 |
| Rosuvastatin Calcium | 344 | 103 |
| Losartan Potassium | 321 | 95 |
| Furosemide | 313 | 58 |
| Atorvastatin Calcium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$732 across 38 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-09
- Last updated
- 2021-05-11
- Certified
- 2021-04-14
Frequently asked questions
- What is David Walker's NPI number?
- David Walker's National Provider Identifier (NPI) is 1639142508, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Walker's specialty?
- David Walker is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is David Walker located?
- David Walker's practice location on file with NPPES is 1333 W 5th St, Ste 112, Sheridan, WY 82801-2752.
- What is David Walker's phone number?
- The practice phone number listed in the NPPES registry for David Walker is (307) 675-2650.
- Does David Walker accept Medicare?
- David Walker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Walker's NPI active?
- Yes — David Walker's NPI (1639142508) is active in the NPPES registry as of the last update on 2021-05-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.