Robert Walker, M.D.
NPI 1659320943 · Internal Medicine Physician · Greenville, SC
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Walker, M.D. is a Internal Medicine Physician provider in Greenville, SC (NPI 1659320943).
Provider details
- NPI number
- 1659320943
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 19534 (SC)
Specialties & taxonomies
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
1,114 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) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 441 | $161 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 218 | $111 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 151 | $74 |
| Advance Care Planning, First 30 Minutes99497 | 90 | $70 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 88 | $107 |
| Critical Care, First 30-74 Minutes99291 | 67 | $199 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 22 | 13 |
| Doxycycline Hyclate | 18 | 18 |
| Diltiazem Hclbrand: Diltiazem 24hr Er (cd) | 14 | — |
| Metformin Hcl | 14 | — |
| Carvedilol | 13 | — |
| Cefdinir | 13 | 13 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 11 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$20 across 1 record (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
- 2006-05-06
- Last updated
- 2016-06-22
Frequently asked questions
- What is Robert Walker's NPI number?
- Robert Walker's National Provider Identifier (NPI) is 1659320943, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Walker's specialty?
- Robert Walker is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Walker located?
- Robert Walker's practice location on file with NPPES is 1007 Grove Rd, Greenville, SC 29605-4630.
- What is Robert Walker's phone number?
- The practice phone number listed in the NPPES registry for Robert Walker is (864) 558-0405.
- Does Robert Walker accept Medicare?
- Robert Walker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Walker's NPI active?
- Yes — Robert Walker's NPI (1659320943) is active in the NPPES registry as of the last update on 2016-06-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.