Donald Mario Robert Harker, MD
Hospitalist Physician · Reno, NV
Donald Mario Robert Harker, MD is a hospitalist physician with a practice address in Reno, Nevada, and NPI 1457934838, issued on May 3, 2021. Check the license (Nevada 25741, as entered in NPPES) on the Nevada State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Donald Mario Robert Harker
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- 25741 NV
Self-reported in NPPES; status is on the state search - Practice location
- 6500 Longley LN, Reno, NV 89511
- Phone
- (775) 799-7320
- Enumerated
- May 3, 2021
- Record last updated
- Jul 26, 2025
- Medicare enrollment
- Enrolled (PECOS I20240924001343); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 239 in Nevada → Look up another NPI →
Also registered at 6500 Longley LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John-Michael Benson, MDHospitalist Physician1578203287
- Lauren Christian, CSFASurgical Assistant1922929124
- Donna Fischer, IBCLCLactation Consultant (Registered Nurse)1619890985
- Curtis Marino, DOEmergency Medicine Physician1023638988
- Casey Pace, PA-CPhysician Assistant1730647389
- Heather Theaderman, RNMedical-Surgical Registered Nurse1518859149
Verify Donald Mario Robert Harker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNevada State Board of Medical Examiners
Search for license 25741Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average hospitalist physician in 2024
296 Medicare Part D claims for 71 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Levothyroxine Sodium17 claims
- Omeprazole15 claims
- Atorvastatin Calcium14 claims
- Lisinopril14 claims
- Albuterol Sulfate Hfa12 claims
- Gabapentin11 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
- Northern Nevada Medical Group LLCSparks, NV
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Donald Mario Robert Harker among 239 hospitalist physician records in Nevada
Donald Mario Robert Harker, MD is one of 239 hospitalist physician records with a practice address in Nevada. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 88% of them.
- NPI issued2021 · 88% of these records are older, 8% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated2020 · median 2012 among the 191 with a school on file
- Record last updated2025 · 36% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Nevada practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Nevada
There are 239 hospitalist physician records in Nevada.
All 239 in Nevada → Every provider in Reno → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- John-Michael Benson, MDReno, NV 895111578203287
- Cameron Seamons, DOReno, NV 895111588245716
- Mohammad Hussain, M.B.B.SReno, NV 895091114615200
- Shamla Badery, D.O.Reno, NV 895031437537305
- Reka Danko, M.D.Reno, NV 895031093987281
- John Deweerd, MDReno, NV 895031730164237
- Nicole Kato, D.O.Reno, NV 895031740675271
- Kelly Lawrence, MDReno, NV 895031396041679
Common questions
What is Donald Mario Robert Harker, MD's NPI number?
Donald Mario Robert Harker, MD's National Provider Identifier (NPI) is 1457934838, issued on May 3, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Donald Mario Robert Harker, MD located?
The NPPES record lists a practice address at 6500 Longley LN, Reno, NV, 89511. Phone: (775) 799-7320. Providers update this record themselves, so call before visiting.
How can I verify Donald Mario Robert Harker, MD's license?
NPPES lists Nevada license number 25741, as entered by the provider. Search the Nevada State Board of Medical Examiners at https://medboard.nv.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Donald Mario Robert Harker, MD prescribe under Medicare Part D?
In 2024, Donald Mario Robert Harker, MD had 296 Medicare Part D claims for 71 beneficiaries; the average among hospitalist physician prescribers was 521. 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.