Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Daniel M Horn, MD

Individual provider Internal Medicine Physician · NPI 1780903971

Dr. Daniel M Horn, MD is an Internal Medicine Physician in Waltham, Massachusetts. Works from 3 locations. Licensed in Alabama, Arizona, Colorado and Florida and 11 more.

Licensed in
AL, AZ, CO, FL, GA, HI
In the registry since
2010
Specialties on file
15
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

221 Crescent St Ste 202
Waltham, MA 02453-3425
Phone: (866) 849-0692
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 1055 Howell Mill Rd Nw Fl 8, Atlanta, GA 30318-5557 — (866) 849-0692
  • 15 Parkman Street, Boston, MA 02114-3117 — (617) 726-2374

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 251716 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD484408 (PA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 100333 (GA)
Internal Medicine Physician Taxonomy 207R00000X · Licence U8885 (TX)
Internal Medicine Physician Taxonomy 207R00000X · Licence DR.0072398 (CO)
Internal Medicine Physician Taxonomy 207R00000X · Licence 91509 (SC)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036.168528 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD.48112 (AL)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD24268 (HI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 35C.001303 (OH)
Internal Medicine Physician Taxonomy 207R00000X · Licence 72732 (AZ)
Internal Medicine Physician Taxonomy 207R00000X · Licence 2024-01822 (NC)
Internal Medicine Physician Taxonomy 207R00000X · Licence ME166617 (FL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 70584 (TN)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD218918 (OR)

Record details

NPI number1780903971
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 27, 2010
Last updated in NPPESJune 11, 2026
Certification dateJune 11, 2026
Mailing addressPo Box 211699, Eagan, MN 55121-3699

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