Norman Callahan, D.O.
NPI 1851367783 · Gastroenterology Physician · Malvern, PA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Norman Callahan, D.O. is a Gastroenterology Physician provider in Malvern, PA (NPI 1851367783).
Provider details
- NPI number
- 1851367783
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- OS007658-L (PA)
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
989 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 | 146 | $254 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 97 | $93 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 96 | $130 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 90 | $103 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High RiskG0105 | 78 | $182 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 267 | 75 |
| Pantoprazole Sodium | 223 | 70 |
| Famotidine | 58 | 20 |
| Ustekinumabbrand: Stelara | 36 | — |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 21 | — |
| Cholestyramine (with Sugar)brand: Cholestyramine | 20 | — |
| Budesonidebrand: Budesonide Dr | 19 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,811 across 82 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
- 2006-02-28
- Last updated
- 2009-08-05
Frequently asked questions
- What is Norman Callahan's NPI number?
- Norman Callahan's National Provider Identifier (NPI) is 1851367783, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Norman Callahan's specialty?
- Norman Callahan is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Norman Callahan located?
- Norman Callahan's practice location on file with NPPES is 325 Central Ave, Malvern, PA 19355-3265.
- What is Norman Callahan's phone number?
- The practice phone number listed in the NPPES registry for Norman Callahan is (610) 644-6755.
- Does Norman Callahan accept Medicare?
- Norman Callahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Norman Callahan's NPI active?
- Yes — Norman Callahan's NPI (1851367783) is active in the NPPES registry as of the last update on 2009-08-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.