DR. CLARK HARRISON (MD) – Gastroenterology Physician, NPI 1679559496
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
143 GASTROENTEROLOGY in NV
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Provider Addresses for DR. CLARK HARRISON (MD)
880, Ryland Street, Reno, Washoe County, Nevada, 89502, United States
RENO, NV 895021603
Phone: (775) 329-4600
Fax: (775) 333-2969
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2022-08-01
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100621000794 | I | Gastroenterology | NV | TBD |
| I20220801000070 | I | Gastroenterology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 73 | 72 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 22 | 22 | $0 |
| 43248 | Insertion of guide wire with dilation of esophagus using a flexible endoscope | 15 | 15 | $0 |
| G0121 | Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 11 | 11 | $0 |
Insurance plans in this area (ZIP 89502)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | NV | 43235 | Diagnostic examination of esophagus, stomach, and/or upper small bowel using an endoscope | 23 | 23 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine, Gastroenterology | NV | |
| G A S T R O E N T E R O L O G Y | NV | |
| Certified Registered Nurse Anesthetist (Crna) | NV | |
| Nurse Practitioner | NV | |
| Nurse Practitioner | NV | |
| Nurse Practitioner | NV | |
| Nurse Practitioner | NV | |
| Nurse Practitioner | NV | |
| - | NV | |
| - | UT |
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