DANIEL ALEXANDER CASTELLANOS M.D.
NPI 1003298126
Pediatrics - Pediatric Cardiology in Boston, MA
About Daniel Alexander Castellanos M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DANIEL ALEXANDER CASTELLANOS M.D. (NPI 1003298126) is an individual pediatric cardiology provider in Boston, Massachusetts, licensed in Massachusetts (283956) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS, is affiliated with Boston Children's Hospital, and is a graduate of Florida International Univ, College Of Medicine (2013).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Daniel Alexander Castellanos M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Daniel Castellanos reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 220 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Boston Children's Hospital
Childrens · Boston, MAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Daniel Castellanos's NPI number?
The NPI number for Daniel Castellanos is 1003298126. It was assigned to this individual provider in the NPPES registry on June 25, 2015.
Where is Daniel Castellanos located?
Daniel Castellanos practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is Daniel Castellanos's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.
Is Daniel Castellanos enrolled in Medicare?
Yes. Daniel Castellanos is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Daniel Castellanos's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Daniel Castellanos reassigns Medicare benefits to Boston Childrens Heart Foundation Inc (Boston, MA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Daniel Castellanos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Daniel Castellanos accept?
Health plans from Anthem Blue Cross and Blue Shield and Taro Health list Daniel Castellanos as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Daniel Castellanos affiliated with any hospitals?
According to CMS data, Daniel Castellanos is affiliated with Boston Children's Hospital.
When was this NPI record last updated?
The NPPES record for Daniel Castellanos was last updated on March 11, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Daniel Alexander Castellanos, M.D. · NPI 1003298126
Pediatric Cardiology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since June 25, 2015.
## Identity
- **NPI:** 1003298126 (Entity type: Individual)
- **Enumerated:** June 25, 2015
- **Primary specialty:** Pediatrics - Pediatric Cardiology · taxonomy 2080P0202X
- **State license:** 283956 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-6000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Boston Childrens Heart Foundation Inc (NPI 1982680922, Boston, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Florida International Univ, College Of Medicine, class of 2013
## Record status
- **NPPES last updated:** March 11, 2021
---
Source: [NPI Profile](https://npiprofile.com/npi/1003298126) · Data from the CMS NPPES public registry.