Andrew Overhiser, M.D.
NPI 1679789549 · Gastroenterology Physician · Flagstaff, AZ
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrew Overhiser, M.D. is a Gastroenterology Physician provider in Flagstaff, AZ (NPI 1679789549).
Provider details
- NPI number
- 1679789549
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 42636 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
456 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 106 | $239 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 82 | $97 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 73 | $127 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 68 | $124 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 41 | $161 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 267 | 260 |
| Pantoprazole Sodium | 178 | 82 |
| Omeprazole | 47 | 18 |
| Famotidine | 39 | 16 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 36 | 35 |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Gavilyte-N | 23 | 21 |
| Dexlansoprazole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$421 across 16 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-15
- Last updated
- 2024-12-12
- Certified
- 2024-12-12
Frequently asked questions
- What is Andrew Overhiser's NPI number?
- Andrew Overhiser's National Provider Identifier (NPI) is 1679789549, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrew Overhiser's specialty?
- Andrew Overhiser is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Andrew Overhiser located?
- Andrew Overhiser's practice location on file with NPPES is 1215 N Beaver St, Flagstaff, AZ 86001-3120.
- What is Andrew Overhiser's phone number?
- The practice phone number listed in the NPPES registry for Andrew Overhiser is (928) 773-2200.
- Does Andrew Overhiser accept Medicare?
- Andrew Overhiser is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrew Overhiser's NPI active?
- Yes — Andrew Overhiser's NPI (1679789549) is active in the NPPES registry as of the last update on 2024-12-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.