NPPES file of Aug 9, 2026

Robert Ricardo Walker, M.D.

Internal Medicine Physician · Greenville, SC

Robert Ricardo Walker, M.D. is an internal medicine physician with a practice address in Greenville, South Carolina, and NPI 1659320943, issued on May 6, 2006. Check the license (South Carolina 19534, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1659320943
Name
Robert Ricardo Walker
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
19534 SC
Self-reported in NPPES; status is on the state search
Practice location
1007 Grove RD, Greenville, SC 29605
Phone
(864) 558-0405
Enumerated
May 6, 2006
Record last updated
Jun 22, 2016 (not updated in 10 years: call before relying on the address or phone)
Fax
(864) 558-0407
Medicaid IDs
GP6470 SC
195345 SC
Medicare enrollment
Enrolled (PECOS I20031201000571); accepts Medicare assignment
Medical or professional school
University Of South Carolina School Of Medicine, 1996
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 1,881 in South Carolina → Look up another NPI →

Also registered at 1007 Grove RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Kaila AndersonPhysical Therapist1326734476
  2. Joseph ClarkPhysical Therapy Assistant1821108770
  3. Madison ClarkOccupational Therapist1225996077
  4. Glen Cumbus, PTPhysical Therapist1306819578
  5. Jared DillinghamPhysical Therapist1285246884
  6. Brianna PetratosPhysical Therapist1396448890

Verify Robert Ricardo Walker in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
    Search for license 19534    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the South Carolina license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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87% fewer Medicare Part D claims than the average internal medicine physician in 2024

409 Medicare Part D claims for 116 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.

  1. Robert Walker409
  2. Specialty average3,176

Most prescribed

  1. Pantoprazole Sodium22 claims
  2. Doxycycline Hyclate18 claims
  3. Diltiazem 24hr Er (Cd)14 claims
  4. Metformin Hcl14 claims
  5. Carvedilol13 claims
  6. Cefdinir13 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $19.57

1 payment: food and beverage; the largest payer was Ceribell, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Robert Walker$19.57
  2. Specialty average$1,303.06

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through 2 group practices

  1. Cogent Healthcare OF Georgia PCAiken, SC
  2. Mcleod Loris Seacoast HospitalLoris, SC

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Robert Ricardo Walker among 1,881 internal medicine physician records in South Carolina

Robert Ricardo Walker, M.D. is one of 1,881 internal medicine physician records with a practice address in South Carolina. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.

  • NPI issued2006 · 7% of these records are older, 58% newer
  • In a Medicare fileYes · 81% of these records are
  • In the CMS Doctors and Clinicians fileYes · 60% of these records are
  • Graduated1996 · median 2006 among the 1,119 with a school on file
  • Record last updated2016 · 46% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

253 internal medicine physician records list a practice address in Greenville

They are 253 of the 10,264 NPPES records with a practice address in Greenville, and 1,881 internal medicine physician records in South Carolina.

All 1,881 in South Carolina → Every provider in Greenville → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Stacy Bizzell, M.D.Greenville, SC 296051427008432
  2. Barry Blackston, M.D.Greenville, SC 296051316948185
  3. Mincs Calixte, M.D.Greenville, SC 296051215990338
  4. Joseph Del Zotto, D.O.Greenville, SC 296051457356776
  5. W Fridy, M.D.Greenville, SC 296051730139429
  6. Merrill Gildersleeve, M.D.Greenville, SC 296051215987060
  7. Paari Gopalakrishnan, MDGreenville, SC 296051316925464
  8. Meenu Jindal, M.D.Greenville, SC 296051548210149

Common questions

What is Robert Ricardo Walker, M.D.'s NPI number?

Robert Ricardo Walker, M.D.'s National Provider Identifier (NPI) is 1659320943, issued on May 6, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Robert Ricardo Walker, M.D. located?

The NPPES record lists a practice address at 1007 Grove RD, Greenville, SC, 29605. Phone: (864) 558-0405. Providers update this record themselves, so call before visiting.

How can I verify Robert Ricardo Walker, M.D.'s license?

NPPES lists South Carolina license number 19534, as entered by the provider. Search the South Carolina Board of Medical Examiners at https://verify.llronline.com/LicLookup/Med/Med.aspx?div=22. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Robert Ricardo Walker, M.D. prescribe under Medicare Part D?

In 2024, Robert Ricardo Walker, M.D. had 409 Medicare Part D claims for 116 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.