DR. DANIEL M HORN MD
NPI 1780903971
Internal Medicine in Waltham, MA
About Dr. Daniel M Horn Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DANIEL M HORN MD (NPI 1780903971) is an individual internal medicine provider in Waltham, Massachusetts, licensed in Massachusetts (251716) and active in the NPI registry since May 2010. He is enrolled in Medicare PECOS and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Daniel M Horn Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
8Medicare enrollment records show Daniel Horn reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 clinicians in this Medicare group
Philadelphia, PA 19107
- Reassigned Medicare billing, Pennsylvania enrollment
- 19 clinicians in this Medicare group
Beachwood, OH 44122
- Reassigned Medicare billing, Alabama, Hawaii and South Carolina enrollments
- 48 clinicians in this Medicare group
Zirconia, NC 28790
- Reassigned Medicare billing, North Carolina enrollment
- 34 clinicians in this Medicare group
Chicago, IL 60606
- Reassigned Medicare billing, Illinois enrollment
- 40 clinicians in this Medicare group
Pembroke Pines, FL 33027
- Reassigned Medicare billing, Arizona, Colorado, Florida, Oregon and Tennessee enrollments
- 68 clinicians in this Medicare group
Houston, TX 77070
- Reassigned Medicare billing, Texas enrollment
- 122 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02453 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 5
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WALTHAM, MA 02453
WALTHAM, MA 02453
WALTHAM, MA 02453
WALTHAM, MA 02453
WALTHAM, MA 02453
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 Horn's NPI number?
The NPI number for Daniel Horn is 1780903971. It was assigned to this individual provider in the NPPES registry on May 27, 2010.
Where is Daniel Horn located?
Daniel Horn practices at 221 Crescent St Ste 202, Waltham, MA 02453. The listed phone number is (866) 849-0692.
What is Daniel Horn's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Daniel Horn enrolled in Medicare?
Yes. Daniel Horn is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Daniel Horn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Daniel Horn reassigns Medicare benefits to 8 organizations: Massachusetts General Physicians Organization Inc (Boston, MA), The General Hospital Corporation (Boston, MA), Devoted Medical PA PC (Philadelphia, PA), Devoted Medical Group Inc (Beachwood, OH), Devoted Medical Nc PC (Zirconia, NC) and 3 more organizations, listed in the Medicare section above. Each 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 Horn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Daniel Horn was last updated on June 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months 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.
# Dr. Daniel M Horn, MD · NPI 1780903971
Internal Medicine physician in Waltham, Massachusetts. Individual provider, active in the CMS NPPES registry since May 27, 2010.
## Identity
- **NPI:** 1780903971 (Entity type: Individual)
- **Enumerated:** May 27, 2010
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 251716 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 221 CRESCENT ST STE 202, Waltham, MA 02453-3425
- **Phone:** (866) 849-0692
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA); Devoted Medical PA PC (NPI 1114642683, Philadelphia, PA); Devoted Medical Group Inc (NPI 1609474527, Beachwood, OH); Devoted Medical Nc PC (NPI 1295443554, Zirconia, NC); and 3 more · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 11, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1780903971) · Data from the CMS NPPES public registry.