Glen Vander Zalm, MD
NPI 1528033578 · Gastroenterology Physician · Orlando, FL
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Glen Vander Zalm, MD is a Gastroenterology Physician provider in Orlando, FL (NPI 1528033578).
Provider details
- NPI number
- 1528033578
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- ME91815 (FL)
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
20 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
535 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 153 | $88 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 139 | $124 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 74 | $107 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 58 | $244 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 28 | $109 |
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 |
|---|---|---|
| Pantoprazole Sodium | 322 | 123 |
| Omeprazole | 157 | 49 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 75 | 73 |
| Esomeprazole Magnesium | 57 | 19 |
| Sod Picosulf/Mag Ox/Citric Acbrand: Clenpiq | 45 | 44 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 36 | 35 |
| Cholestyramine (with Sugar) |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,055 across 57 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
- 2006-02-22
- Last updated
- 2011-03-24
Frequently asked questions
- What is Glen Vander Zalm's NPI number?
- Glen Vander Zalm's National Provider Identifier (NPI) is 1528033578, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Glen Vander Zalm's specialty?
- Glen Vander Zalm is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Glen Vander Zalm located?
- Glen Vander Zalm's practice location on file with NPPES is 3885 Oakwater Cir, Orlando, FL 32806-6257.
- What is Glen Vander Zalm's phone number?
- The practice phone number listed in the NPPES registry for Glen Vander Zalm is (407) 851-5600.
- Does Glen Vander Zalm accept Medicare?
- Glen Vander Zalm is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Glen Vander Zalm's NPI active?
- Yes — Glen Vander Zalm's NPI (1528033578) is active in the NPPES registry as of the last update on 2011-03-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.