Hillard R. Zallen, MD
Family Medicine Physician · Longmont, CO
Hillard R. Zallen, MD is a family medicine physician with a practice address in Longmont, Colorado, and NPI 1225157712, issued on Mar 28, 2007. Check the license (Colorado 43118, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Hillard R. Zallen
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 43118 CO
Self-reported in NPPES; status is on the state search - Practice location
- 2345 Bent Way, Longmont, CO 80503
- Phone
- (303) 338-4545
- Enumerated
- Mar 28, 2007
- Record last updated
- May 7, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 09655212 CO
- Medicare enrollment
- Enrolled (PECOS I20100113000870); accepts Medicare assignment
- Medical or professional school
- University Of New Mexico School Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,563 in Colorado → Look up another NPI →
Also registered at 2345 Bent Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Deborah Archer, MDPediatrics Physician1437135613
- Dawn Barela, LCSWClinical Social Worker1033369061
- Laura BocciaRegistered Nurse1134399504
- Devyn Bonatus, LCSWClinical Social Worker1992425961
- Kirsten Borbe, M.D.Internal Medicine Physician1184751117
- Michael Borkowski, PAMedical Physician Assistant1457495244
Verify Hillard R. Zallen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 43118Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
28% more Medicare Part D claims than the average family medicine physician in 2024
4,546 Medicare Part D claims for 608 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 47 claims were for opioids.
Most prescribed
- Atorvastatin Calcium491 claims
- Levothyroxine Sodium251 claims
- Lisinopril240 claims
- Tamsulosin Hcl183 claims
- Metformin Hcl170 claims
- Simvastatin133 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Colorado Permanente Medical Group PCLongmont, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hillard R. Zallen among 3,563 family medicine physician records in Colorado
Hillard R. Zallen, MD is one of 3,563 family medicine physician records with a practice address in Colorado. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 42% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1999 · median 2008 among the 2,077 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
73 family medicine physician records list a practice address in Longmont
They are 73 of the 2,381 NPPES records with a practice address in Longmont, and 3,563 family medicine physician records in Colorado.
All 3,563 in Colorado → Every provider in Longmont → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Anjoli Dixit, MDLongmont, CO 805031144554692
- Liliana Gomez-Medley, MDLongmont, CO 805031992945257
- Jill Murphey, MDLongmont, CO 805031962403782
- Egor PakhomovLongmont, CO 805031184588873
- Suzanne Parsons, M.D.Longmont, CO 805031841266293
- Fabio Pivetta, DOLongmont, CO 805031023226503
- Alison Railsback, MDLongmont, CO 805031043281777
- Franklin Thom, MDLongmont, CO 805031013044064
Common questions
What is Hillard R. Zallen, MD's NPI number?
Hillard R. Zallen, MD's National Provider Identifier (NPI) is 1225157712, issued on Mar 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Hillard R. Zallen, MD located?
The NPPES record lists a practice address at 2345 Bent Way, Longmont, CO, 80503. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Hillard R. Zallen, MD's license?
NPPES lists Colorado license number 43118, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Hillard R. Zallen, MD prescribe under Medicare Part D?
In 2024, Hillard R. Zallen, MD had 4,546 Medicare Part D claims for 608 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.