Robert S. Callahan, MD
Family Medicine Physician · Newark, DE
Robert S. Callahan, MD is a family medicine physician with a practice address in Newark, Delaware, and NPI 1962491779, issued on Oct 14, 2005. Check the license (Delaware C1-0008123, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Robert S. Callahan
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- C1-0008123 DE
Self-reported in NPPES; status is on the state search - Practice location
- 32 Omega Dr, Newark, DE 19713
- Phone
- (302) 731-0942
- Enumerated
- Oct 14, 2005
- Record last updated
- Oct 5, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (302) 444-8491
- Medicare enrollment
- Enrolled (PECOS I20070126000609); accepts Medicare assignment
- Medical or professional school
- Hahnemann University College Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 518 in Delaware → Look up another NPI →
Also registered at 32 Omega Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Huy Le, D.O.Family Medicine Physician1831170703
Verify Robert S. Callahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDelaware Board of Medical Licensure and Discipline
Search for license C1-0008123Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% more Medicare Part D claims than the average family medicine physician in 2024
4,981 Medicare Part D claims for 394 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 120 claims were for opioids.
Most prescribed
- Atorvastatin Calcium364 claims
- Rosuvastatin Calcium247 claims
- Amlodipine Besylate224 claims
- Levothyroxine Sodium184 claims
- Alprazolam171 claims
- Lisinopril171 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: $1,452.87
77 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 55,478 providers of this specialty with any payment received $902.55 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.
Bills Medicare through one group practice
- Stoney Batter Family Medicine Associates PAWilmington, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert S. Callahan among 518 family medicine physician records in Delaware
Robert S. Callahan, MD is one of 518 family medicine physician records with a practice address in Delaware. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1999 · median 2002 among the 323 with a school on file
- Record last updated2016 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
84 family medicine physician records list a practice address in Newark
They are 84 of the 4,662 NPPES records with a practice address in Newark, and 518 family medicine physician records in Delaware.
All 518 in Delaware → Every provider in Newark → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Alfred Fletcher, MDNewark, DE 197131962489377
- Barbara Hamming, MDNewark, DE 197131871570283
- Elizabeth Jackovic, DONewark, DE 197131982682886
- Brian Janney, D.O.Newark, DE 197131598763724
- Mary Kobak, MDNewark, DE 197131790763696
- Huy Le, D.O.Newark, DE 197131831170703
- Susan Livesay, MDNewark, DE 197131477531390
- Lisa Martin, D.O.Newark, DE 197131427050665
Common questions
What is Robert S. Callahan, MD's NPI number?
Robert S. Callahan, MD's National Provider Identifier (NPI) is 1962491779, issued on Oct 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Robert S. Callahan, MD located?
The NPPES record lists a practice address at 32 Omega Dr, Newark, DE, 19713. Phone: (302) 731-0942. Providers update this record themselves, so call before visiting.
How can I verify Robert S. Callahan, MD's license?
NPPES lists Delaware license number C1-0008123, as entered by the provider. Search the Delaware Board of Medical Licensure and Discipline at https://delpros.delaware.gov/OH_VerifyLicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert S. Callahan, MD prescribe under Medicare Part D?
In 2024, Robert S. Callahan, MD had 4,981 Medicare Part D claims for 394 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 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.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.