Norman Callahan, D.O.
Gastroenterology Physician · Malvern, PA
Norman Callahan, D.O. is a gastroenterology physician with a practice address in Malvern, Pennsylvania, and NPI 1851367783, issued on Feb 28, 2006. Check the license (Pennsylvania OS007658-L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Norman Callahan
- Credential
- D.O.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- OS007658-L PA
Self-reported in NPPES; status is on the state search - Practice location
- 325 Central Ave, Malvern, PA 19355
- Phone
- (610) 644-6755
- Enumerated
- Feb 28, 2006
- Entity
- Type 1 · individual
Also registered at 325 Central Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nicole Albert, D.O.Internal Medicine Physician1609188879
- Emmie Amerine, CRNPAdult Health Nurse Practitioner1467428474
- Matthew Astroff, M.D.Gastroenterology Physician1457327439
- Maura Barr, DOGastroenterology Physician1275869752
- Janine Barsoum, DOObstetrics & Gynecology Physician1861451973
- M Hossein Etezady, MDChild & Adolescent Psychiatry Physician1548249840
Verify Norman Callahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS007658-LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
10% more Medicare Part D claims than the average gastroenterology physician in 2024
932 Medicare Part D claims for 273 beneficiaries, against an average of 848 among the 13,066 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Omeprazole267 claims
- Pantoprazole Sodium223 claims
- Famotidine58 claims
- Stelara36 claims
- Dexlansoprazole Dr21 claims
- Cholestyramine20 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.
Industry payments in 2024: $1,811.47
82 payments, mostly food and beverage; the largest payer was Abbvie Inc.. The 10,593 providers of this specialty with any payment received $4,948.62 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
One hospital or facility affiliation
- Regional Gastroenterology Associates OF Lancaster, Ltd.Lancaster, PA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
11 gastroenterology physician records list a Malvern practice address
They are 11 of the 539 NPPES records with a Malvern practice address, and 876 gastroenterology physician records in Pennsylvania.
All 11 in Malvern → All 876 in Pennsylvania → Every provider in Malvern →
Other gastroenterology physician records in Pennsylvania
- Gebran Abboud, M.D.Johnstown, PA1518160373
- Heitham Abdul-Baki, M.D.Pittsburgh, PA1790978542
- Ahmed Abdulhamid, M.D.Hershey, PA1326592775
- Faten Aberra, MDPhiladelphia, PA1225042989
- Segun Abogunde, MDErie, PA1659302669
- Jeffrey Abrams, M.D.Phila, PA1174582076
- John Abramson, M.D.Wynnewood, PA1710953633
- Abimbola Adenote, MDErie, PA1952786543
- Christopher Adkins, M.D.Phila, PA1023350766
- Radheshyam Agrawal, MDPittsburgh, PA1518966670
Common questions
What is Norman Callahan, D.O.'s NPI number?
Norman Callahan, D.O.'s National Provider Identifier (NPI) is 1851367783, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Norman Callahan, D.O. located?
The NPPES record lists a practice address at 325 Central Ave, Malvern, PA, 19355. Phone: (610) 644-6755. Providers update this record themselves, so call before visiting.
How can I verify Norman Callahan, D.O.'s license?
NPPES lists Pennsylvania license number OS007658-L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Norman Callahan, D.O. prescribe under Medicare Part D?
In 2024, Norman Callahan, D.O. had 932 Medicare Part D claims for 273 beneficiaries; the average among gastroenterology physician prescribers was 848. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.