NPPES file of Aug 9, 2026

William A. Castaldo, M.D.

Critical Care Medicine (Internal Medicine) Physician · Troy, OH

William A. Castaldo, M.D. is a critical care medicine (internal medicine) physician with a practice address in Troy, Ohio, and NPI 1588669139, issued on Jun 20, 2005. Check the license (Ohio 35064655, as entered in NPPES) on the State Medical Board of Ohio; 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
1588669139
Name
William A. Castaldo
Credential
M.D.
Primary taxonomy
Critical Care Medicine (Internal Medicine) Physician 207RC0200X
License number
35064655 OH
Self-reported in NPPES; status is on the state search
Practice location
3006 N County Road 25A, Troy, OH 45373
Phone
(937) 335-2075
Enumerated
Jun 20, 2005
Record last updated
Apr 12, 2013 (not updated in 13 years: call before relying on the address or phone)
Fax
(937) 339-0612
Medicaid ID
0918181 OH
Medicare enrollment
Enrolled (PECOS I20220729001161); accepts Medicare assignment
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 critical care medicine (internal medicine) physician records → All 204 in Ohio → Look up another NPI →

Also registered at 3006 N County Road 25A

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

  1. Megan CotnerNurse Practitioner1407465636
  2. Cass Cullis, MDCardiovascular Disease Physician1982607172
  3. Jill Cyphers, FNPFamily Nurse Practitioner1578748612
  4. Josefina Ferree, APRN-FNP-CFamily Nurse Practitioner1699247072
  5. Susan Hoying, CNPAcute Care Nurse Practitioner1972583458
  6. Aaron Kaibas, DOCardiovascular Disease Physician1396837985

Verify William A. Castaldo in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersState Medical Board of Ohio
    Search for license 35064655    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 Ohio license search

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8% fewer Medicare Part D claims than the average critical care medicine (internal medicine) physician in 2024

642 Medicare Part D claims for 93 beneficiaries, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D. Brand-name drugs were 57% of claims.

  1. William Castaldo642
  2. Specialty average696

Most prescribed

  1. Azithromycin151 claims
  2. Albuterol Sulfate Hfa130 claims
  3. Trelegy Ellipta85 claims
  4. Spiriva Respimat32 claims
  5. Fluticasone-Salmeterol26 claims
  6. Montelukast Sodium23 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: $38.59

2 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 2,708 providers of this specialty with any payment received $2,958.68 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. William Castaldo$38.59
  2. Specialty average$2,958.68

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

  1. Beacon Medical Group IncElkhart, IN

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

William A. Castaldo among 204 critical care medicine (internal medicine) physician records in Ohio

William A. Castaldo, M.D. is one of 204 critical care medicine (internal medicine) physician records with a practice address in Ohio. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 84% newer
  • In a Medicare fileYes · 88% of these records are
  • In the CMS Doctors and Clinicians fileYes · 80% of these records are
  • Graduated1981 · median 2008 among the 164 with a school on file
  • Record last updated2013 · 47% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Critical Care Medicine (Internal Medicine) Physician providers in Ohio

There are 204 critical care medicine (internal medicine) physician records in Ohio.

All 204 in Ohio → Every provider in Troy → Critical Care Medicine (Internal Medicine) Physician nationwide →

The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes

  1. Georges Yacoub, MDTroy, OH 453731487659041
  2. Timothy Hauser, M.D.Dayton, OH 454091437386133
  3. Alexander KobzikDayton, OH 454091629344312
  4. Joseph NobileDayton, OH 454091780926063
  5. Gnan Thakore, M.D.Dayton, OH 454091710979000
  6. Timothy Janz, M.D.Dayton, OH 454281538196639
  7. Perry Nystrom, MDDayton, OH 454281083695886
  8. Median Ali, M.D.Kettering, OH 454291649253113

Common questions

What is William A. Castaldo, M.D.'s NPI number?

William A. Castaldo, M.D.'s National Provider Identifier (NPI) is 1588669139, issued on Jun 20, 2005. An NPI identifies a provider in billing; it is not a license.

Where is William A. Castaldo, M.D. located?

The NPPES record lists a practice address at 3006 N County Road 25A, Troy, OH, 45373. Phone: (937) 335-2075. Providers update this record themselves, so call before visiting.

How can I verify William A. Castaldo, M.D.'s license?

NPPES lists Ohio license number 35064655, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does William A. Castaldo, M.D. prescribe under Medicare Part D?

In 2024, William A. Castaldo, M.D. had 642 Medicare Part D claims for 93 beneficiaries; the average among critical care medicine (internal medicine) physician prescribers was 696. 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.