Clark Harrison, MD
Gastroenterology Physician · Reno, NV
Clark Harrison, MD is a gastroenterology physician with a practice address in Reno, Nevada, and NPI 1679559496, issued on Dec 22, 2005. Check the license (Nevada 6505, as entered in NPPES) on the Nevada State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Clark Harrison
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 6505 NV
Self-reported in NPPES; status is on the state search - Practice location
- 880 Ryland St, Reno, NV 89502
- Phone
- (775) 329-4600
- Enumerated
- Dec 22, 2005
- Record last updated
- May 7, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (775) 333-2969
- Medicaid ID
- 2016237 NV
- Medicare enrollment
- Enrolled (PECOS I20100621000794); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 1992
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 119 in Nevada → Look up another NPI →
Also registered at 880 Ryland St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah Edge, APRN-FNPFamily Nurse Practitioner1417789975
- Tomas Hinojosa, M.D.Gastroenterology Physician1497719405
- Ting-Hui Hsieh, M.D.Gastroenterology Physician1326234667
- Paul Johns, PA-CPhysician Assistant1740266568
- Matthew KovalNurse Practitioner1609757897
- Amelia ManguneAcute Care Nurse Practitioner1316656473
Verify Clark Harrison in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNevada State Board of Medical Examiners
Search for license 6505Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average gastroenterology physician in 2024
107 Medicare Part D claims for 99 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 25% of claims.
Most prescribed
- Gavilyte-G61 claims
- Peg-3350 And Electrolytes22 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 98.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Gastroenterology Consultants LtdReno, NV
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clark Harrison among 119 gastroenterology physician records in Nevada
Clark Harrison, MD is one of 119 gastroenterology physician records with a practice address in Nevada. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1992 · median 1998 among the 92 with a school on file
- Record last updated2010 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Nevada practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Nevada
There are 119 gastroenterology physician records in Nevada.
All 119 in Nevada → Every provider in Reno → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Edward Alper, M.D.Reno, NV 895021467418533
- Sadra Azizi-Ghannad, M.D.Reno, NV 895021639435084
- Tomas Hinojosa, M.D.Reno, NV 895021497719405
- Ting-Hui Hsieh, M.D.Reno, NV 895021326234667
- Chia-Yang Hsu, M.D.Reno, NV 895021609260892
- Christi Matteoni, MDReno, NV 895021265418099
- Eric Osgard, M.D.Reno, NV 895021457368565
- Jennifer Racca, M.D.Reno, NV 895021629032503
Common questions
What is Clark Harrison, MD's NPI number?
Clark Harrison, MD's National Provider Identifier (NPI) is 1679559496, issued on Dec 22, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Clark Harrison, MD located?
The NPPES record lists a practice address at 880 Ryland St, Reno, NV, 89502. Phone: (775) 329-4600. Providers update this record themselves, so call before visiting.
How can I verify Clark Harrison, MD's license?
NPPES lists Nevada license number 6505, 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 Clark Harrison, MD prescribe under Medicare Part D?
In 2024, Clark Harrison, MD had 107 Medicare Part D claims for 99 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Clark Harrison, MD's MIPS final score?
The 2023 MIPS final score is 98.9 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.