NPPES file of Aug 9, 2026

Daniel Alexander Castellanos, M.D.

Pediatric Cardiology Physician · Boston, MA

Daniel Alexander Castellanos, M.D. is a pediatric cardiology physician with a practice address in Boston, Massachusetts, and NPI 1003298126, issued on Jun 25, 2015. Check the license (Massachusetts 283956, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; 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
1003298126
Name
Daniel Alexander Castellanos
Credential
M.D.
Primary taxonomy
Pediatric Cardiology Physician 2080P0202X
License numbers
283956 MA
ETL5309 MA
Q8849 TX
Self-reported in NPPES; status is on the state search
Practice location
300 Longwood Ave, Boston, MA 02115
Phone
(617) 355-6000
Enumerated
Jun 25, 2015
Record last updated
Mar 11, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20200929001213); accepts Medicare assignment
Medical or professional school
Florida International Univ, College Of Medicine, 2013
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.
Download card Updates feed

Also registered at 300 Longwood Ave

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

  1. Sylvia Abadir, MDPediatric Cardiology Physician1427366459
  2. Isabel Abbott, MDNeurology with Special Qualifications in Child Neurology Physician1033772579
  3. Kristin Abdelnour, PTPhysical Therapist1982821302
  4. Mohamed Abdelrahman, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1558050591
  5. Nadia Abdulrazak, N.P.Adult Health Nurse Practitioner1952616682
  6. Dhatri AbeyaratneStudent in an Organized Health Care Education/Training Program1437098233

Verify Daniel Alexander Castellanos in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
    Search for license 283956    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 Massachusetts 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.

Is this page about you? You can ask us to correct, restrict or remove it: how.

Industry payments in 2024: $253.79

20 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 1,156 providers of this specialty with any payment received $2,864.57 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Daniel Castellanos$253.79
  2. Specialty average$2,864.57

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. Boston Childrens Heart Foundation IncBoston, MA

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

Pediatric Cardiology Physician providers in Massachusetts

There are 129 pediatric cardiology physician records in Massachusetts.

All 129 in Massachusetts → Every provider in Boston →

Other pediatric cardiology physician records in Massachusetts

  1. Sylvia Abadir, MDBoston, MA1427366459
  2. Safwat Aly, MDBoston, MA1194160069
  3. Lucy Arnold, MDBoston, MA1689682379
  4. Joseph Atallah, M.D.Boston, MA1710149190
  5. Duraisamy Balaguru, MDBoston, MA1154382703
  6. Gunjan Banga, M.DSpringfield, MA1184912727
  7. Virginie Beausejour Ladouceur, M. D.Boston, MA1154679413
  8. Oscar Benavidez, MDBoston, MA1386622603
  9. Lisa Bergersen, MD MPHBoston, MA1942299730
  10. Rebecca Beroukhim, M.D.Boston, MA1578687109

Common questions

What is Daniel Alexander Castellanos, M.D.'s NPI number?

Daniel Alexander Castellanos, M.D.'s National Provider Identifier (NPI) is 1003298126, issued on Jun 25, 2015. An NPI identifies a provider in billing; it is not a license.

Where is Daniel Alexander Castellanos, M.D. located?

The NPPES record lists a practice address at 300 Longwood Ave, Boston, MA, 02115. Phone: (617) 355-6000. Providers update this record themselves, so call before visiting.

How can I verify Daniel Alexander Castellanos, M.D.'s license?

NPPES lists Massachusetts license number 283956, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

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.