Daniel R. Zenk, MD
Internal Medicine Physician · Greeley, CO
Daniel R. Zenk, MD is an internal medicine physician with a practice address in Greeley, Colorado, and NPI 1326026956, issued on Jan 4, 2006. Check the license (Colorado 33395, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Daniel R. Zenk
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 33395 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1900 16TH St, Greeley, CO 80631
- Phone
- (970) 350-2438
- Enumerated
- Jan 4, 2006
- Record last updated
- Jul 1, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (970) 350-2473
- Medicaid ID
- 01333954 CO
- Medicare enrollment
- Enrolled (PECOS I20090915000156); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,046 in Colorado → Look up another NPI →
Also registered at 1900 16TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Janell Durnen, MSN, APN, FNP-BCFamily Nurse Practitioner1265874929
Verify Daniel R. Zenk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 33395Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.9 times the Medicare Part D claims of the average internal medicine physician in 2024
15,413 Medicare Part D claims for 1,183 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 233 claims were for opioids.
Most prescribed
- Levothyroxine Sodium977 claims
- Atorvastatin Calcium942 claims
- Lisinopril817 claims
- Losartan Potassium735 claims
- Omeprazole615 claims
- Amlodipine Besylate603 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 2 group practices
- Poudre Valley Medical Group LLCFirestone, CO
- Select Physical Therapy OF West Denver Limited PartnershipGreeley, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Daniel R. Zenk among 2,046 internal medicine physician records in Colorado
Daniel R. Zenk, MD is one of 2,046 internal medicine physician records with a practice address in Colorado. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1991 · median 2006 among the 1,090 with a school on file
- Record last updated2013 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
37 internal medicine physician records list a practice address in Greeley
They are 37 of the 3,518 NPPES records with a practice address in Greeley, and 2,046 internal medicine physician records in Colorado.
All 2,046 in Colorado → Every provider in Greeley → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mark Berntsen, MDGreeley, CO 806311730166687
- Julia BruceGreeley, CO 806311639136385
- Robert Cash, MDGreeley, CO 806311285611152
- Tesfaye Demeke, MDGreeley, CO 806311255352217
- Danielle Doro, M.D.Greeley, CO 806311437145190
- John Ebens, MDGreeley, CO 806311649257544
- Barbara Emerson, M.D.Greeley, CO 806311164573291
- Steven Kalt, MDGreeley, CO 806311225011554
Common questions
What is Daniel R. Zenk, MD's NPI number?
Daniel R. Zenk, MD's National Provider Identifier (NPI) is 1326026956, issued on Jan 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Daniel R. Zenk, MD located?
The NPPES record lists a practice address at 1900 16TH St, Greeley, CO, 80631. Phone: (970) 350-2438. Providers update this record themselves, so call before visiting.
How can I verify Daniel R. Zenk, MD's license?
NPPES lists Colorado license number 33395, 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 Daniel R. Zenk, MD prescribe under Medicare Part D?
In 2024, Daniel R. Zenk, MD had 15,413 Medicare Part D claims for 1,183 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.