Hillard Zallen, MD
NPI 1225157712 · Family Medicine Physician · Longmont, CO
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hillard Zallen, MD is a Family Medicine Physician provider in Longmont, CO (NPI 1225157712).
Provider details
- NPI number
- 1225157712
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 43118 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 · 74 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 491 | 149 |
| Levothyroxine Sodium | 251 | 73 |
| Lisinopril | 240 | 75 |
| Tamsulosin Hcl | 183 | 59 |
| Metformin Hcl | 170 | 50 |
| Simvastatin | 133 | 42 |
| Losartan Potassium | 132 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-28
- Last updated
- 2021-05-07
- Certified
- 2021-05-07
Frequently asked questions
- What is Hillard Zallen's NPI number?
- Hillard Zallen's National Provider Identifier (NPI) is 1225157712, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hillard Zallen's specialty?
- Hillard Zallen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Hillard Zallen located?
- Hillard Zallen's practice location on file with NPPES is 2345 Bent Way, Longmont, CO 80503-7614.
- What is Hillard Zallen's phone number?
- The practice phone number listed in the NPPES registry for Hillard Zallen is (303) 338-4545.
- Does Hillard Zallen accept Medicare?
- Hillard Zallen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hillard Zallen's NPI active?
- Yes — Hillard Zallen's NPI (1225157712) is active in the NPPES registry as of the last update on 2021-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.