Daniel Horn, MD
NPI 1780903971 · Internal Medicine Physician · Waltham, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Daniel Horn, MD is a Internal Medicine Physician provider in Waltham, MA (NPI 1780903971).
Provider details
- NPI number
- 1780903971
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 91509 (SC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 149 | 78 |
| Amlodipine Besylate | 126 | 67 |
| Hydrochlorothiazide | 54 | 26 |
| Lisinopril | 50 | 29 |
| Losartan Potassium | 43 | 23 |
| Metformin Hcl | 40 | 20 |
| Rosuvastatin Calcium |
Practice location
Mailing address
Additional practice locations (1)
- 15 Parkman StreetWac 612Boston, MA 02114-3117Phone: (617) 726-2374Fax: (617) 726-4495
Registry dates
- Enumerated
- 2010-05-27
- Last updated
- 2026-05-26
- Certified
- 2026-05-26
Frequently asked questions
- What is Daniel Horn's NPI number?
- Daniel Horn's National Provider Identifier (NPI) is 1780903971, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Daniel Horn's specialty?
- Daniel Horn is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Daniel Horn located?
- Daniel Horn's practice location on file with NPPES is 221 Crescent St Ste 202, Waltham, MA 02453-3425.
- What is Daniel Horn's phone number?
- The practice phone number listed in the NPPES registry for Daniel Horn is (866) 849-0692.
- Does Daniel Horn accept Medicare?
- Daniel Horn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Daniel Horn's NPI active?
- Yes — Daniel Horn's NPI (1780903971) is active in the NPPES registry as of the last update on 2026-05-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.