Walter R. Castro, MD
Internal Medicine Physician · Jacksonville, FL
Walter R. Castro, MD is an internal medicine physician with a practice address in Jacksonville, Florida, and NPI 1659909851, issued on Apr 1, 2020. Check the license (Florida ME161136, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Walter R. Castro
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- ME161136 FL
Self-reported in NPPES; status is on the state search - Practice location
- 655 W 8TH St, Jacksonville, FL 32209
- Phone
- (904) 383-1002
- Enumerated
- Apr 1, 2020
- Record last updated
- Jun 11, 2023
- Medicare enrollment
- Enrolled (PECOS I20230308003306); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 10,151 in Florida → Look up another NPI →
Also registered at 655 W 8TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Erika AbernathySocial Worker1013387661
- Cheryl Jayne Abrenica, RNRegistered Nurse1215425012
- Maryam Abubakar, MD, MPHNeonatal-Perinatal Medicine Physician1003290214
- Mohannad Abushora, MDPediatric Anesthesiology Physician1740813807
Verify Walter R. Castro in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license ME161136Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average internal medicine physician in 2024
690 Medicare Part D claims for 137 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 29 claims were for opioids.
Most prescribed
- Gabapentin33 claims
- Atorvastatin Calcium30 claims
- Metoprolol Succinate22 claims
- Trazodone Hcl22 claims
- Losartan Potassium20 claims
- Pantoprazole Sodium20 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: $130.42
6 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, 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.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Sound Physicians OF Florida VI LLCFort Lauderdale, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter R. Castro among 10,151 internal medicine physician records in Florida
Walter R. Castro, MD is one of 10,151 internal medicine physician records with a practice address in Florida. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 86% of them.
- NPI issued2020 · 86% of these records are older, 11% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2020 · median 2004 among the 6,606 with a school on file
- Record last updated2023 · 48% 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 Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
546 internal medicine physician records list a practice address in Jacksonville
They are 546 of the 24,194 NPPES records with a practice address in Jacksonville, and 10,151 internal medicine physician records in Florida.
All 10,151 in Florida → Every provider in Jacksonville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Arshia Cottey, MDJacksonville, FL 322091871562579
- Linda Edwards, M.D.Jacksonville, FL 322091144296559
- Malcolm Foster, M.D.Jacksonville, FL 322091962478370
- Alan Halperin, M.D.Jacksonville, FL 322091699741017
- Jeffrey House, D.O.Jacksonville, FL 322091033185236
- Lisa Jones, MDJacksonville, FL 322091538131842
- Ghania Masri, M.D.Jacksonville, FL 322091407822828
- Senthil Meenrajan, M.D.Jacksonville, FL 322091215903638
Common questions
What is Walter R. Castro, MD's NPI number?
Walter R. Castro, MD's National Provider Identifier (NPI) is 1659909851, issued on Apr 1, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Walter R. Castro, MD located?
The NPPES record lists a practice address at 655 W 8TH St, Jacksonville, FL, 32209. Phone: (904) 383-1002. Providers update this record themselves, so call before visiting.
How can I verify Walter R. Castro, MD's license?
NPPES lists Florida license number ME161136, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Walter R. Castro, MD prescribe under Medicare Part D?
In 2024, Walter R. Castro, MD had 690 Medicare Part D claims for 137 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.
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.