Zachary Parnell Giesen, DO
Cardiovascular Disease Physician · Medford, OR
Zachary Parnell Giesen, DO is a cardiovascular disease physician with a practice address in Medford, Oregon, and NPI 1083077408, issued on Apr 2, 2016. Check the license (Oregon DO209735, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Zachary Parnell Giesen
- Credential
- DO
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- DO209735 OR
Self-reported in NPPES; status is on the state search - Practice location
- 520 Medical Center Dr Ste 200, Medford, OR 97504
- Phone
- (541) 930-7222
- Enumerated
- Apr 2, 2016
- Record last updated
- Jul 29, 2022
- Fax
- (541) 930-7220
- Medicaid ID
- 500806325 OR
- Medicare enrollment
- Enrolled (PECOS I20220513000454); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 265 in Oregon → Look up another NPI →
Also registered at 520 Medical Center Dr Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tiffany AllenNurse Practitioner1346849890
- Alyssa Corley, MDInterventional Cardiology Physician1962931204
- Rohit Malhotra, M.D.Interventional Cardiology Physician1073953154
- Thomas Norby, FNPPrimary Care Nurse Practitioner1811994247
- Keval Patel, M.D.Cardiovascular Disease Physician1457649626
- Beatriz Rivera Rodriguez, M.DCardiovascular Disease Physician1710506415
Verify Zachary Parnell Giesen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license DO209735Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
1,928 Medicare Part D claims for 365 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Metoprolol Succinate327 claims
- Eliquis180 claims
- Losartan Potassium129 claims
- Atorvastatin Calcium122 claims
- Furosemide101 claims
- Spironolactone90 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 3 group practices
- AsanteMedford, OR
- Asante Three Rivers Medical Center LLCGrants Pass, OR
- Southern Oregon Cardiology LLCGrants Pass, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Zachary Parnell Giesen among 265 cardiovascular disease physician records in Oregon
Zachary Parnell Giesen, DO is one of 265 cardiovascular disease physician records with a practice address in Oregon. 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 2016, is newer than 92% of them.
- NPI issued2016 · 92% of these records are older, 7% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2016 · median 2001 among the 182 with a school on file
- Record last updated2022 · 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 207RC0000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in Oregon
There are 265 cardiovascular disease physician records in Oregon.
All 265 in Oregon → Every provider in Medford → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Donald Bowser, NPMedford, OR 975041023165925
- Jon Brower, MDMedford, OR 975041467402974
- Douglas Burwell, M.D.Medford, OR 975041881605673
- James Cook, MDMedford, OR 975041134103344
- Timo Dygert, M.D.Medford, OR 975041598971038
- John Forsyth, MDMedford, OR 975041699745109
- Miruais Hamed, MDMedford, OR 975041437291465
- Mark Huth, MD, FACCMedford, OR 975041669461208
Common questions
What is Zachary Parnell Giesen, DO's NPI number?
Zachary Parnell Giesen, DO's National Provider Identifier (NPI) is 1083077408, issued on Apr 2, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Zachary Parnell Giesen, DO located?
The NPPES record lists a practice address at 520 Medical Center Dr Ste 200, Medford, OR, 97504. Phone: (541) 930-7222. Providers update this record themselves, so call before visiting.
How can I verify Zachary Parnell Giesen, DO's license?
NPPES lists Oregon license number DO209735, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Zachary Parnell Giesen, DO prescribe under Medicare Part D?
In 2024, Zachary Parnell Giesen, DO had 1,928 Medicare Part D claims for 365 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. 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.